 vibratory flow meter, and, meter verification method for vibratory flow meter
专利摘要:
VIBRATORY FLOW METER, AND, METER VERIFICATION METHOD FOR A VIBRATORY FLOW METER A vibrating flow meter (5) for meter verification is provided, including meter electronics (20) configured to vibrate the flow meter assembly (10 ) in a primary vibration mode using the first and second drivers (180L, 180R), determine first and second primary mode currents (230) of the first and second drivers (180L, 180R) for the primary vibration mode and determine first and second second primary mode response voltages (231) generated by the first and second bypass sensors (170L, 170R) for the primary vibration mode, generate a meter stiffness value (216) using the first and second currents in the primary mode ( 230) and the first and second response voltages in a primary way (231), and verify correct operation of the vibratory flow meter (5) using the meter stiffness value (216). 公开号:BR112015030471B1 申请号:R112015030471-0 申请日:2014-05-20 公开日:2020-11-10 发明作者:Rensing Matthew Joseph；Larsen Christopher George (Falecido)；Cunningham Timothy J 申请人:Micro Motion, Inc； IPC主号:
专利说明:
TECHNICAL FIELD [0001] The present invention relates to a vibratory flow meter and method and, more particularly, to a vibratory flow meter and method for meter verification. BACKGROUND OF THE INVENTION [0002] Vibrating duct sensors, such as Coriolis mass flow meters and vibrating densitometers, typically operate by detecting movement of a vibrating duct that contains a flowing material. Properties associated with the material in the conduit, such as mass flow, density and the like, can be determined by processing the measurement signals received from the motion transducers associated with the conduit. The vibration modes of the system filled with vibrating material are generally affected by the combined mass, stiffness and damping characteristics of the duct and the material contained therein. [0003] A Coriolis mass flow meter with typical double actuator, or multiple inlet, multiple outlet (MIMO) includes one or more conduits, or flow tubes, which are connected in line to a pipe or other transport and material system conduction, for example, fluids, slurries, emulsions, and the like, in the system. Each conduit can be seen as having a set of natural vibration modes, including for example, simple, torsional, radial and coupled modes. In a typical dual actuator Coriolis mass flow measurement application, a conduit is excited in one or more modes of vibration as a material flows through the conduit, and conduit motion is measured at spaced points along the conduit. Excitation is typically provided by two actuators, for example, electromechanical devices, such as voice coil actuators, which disturb the conduit in a periodic manner. Mass flow rate can be determined by measuring time delay or phase differences between movements at the locations of the transducer. Two of such transducers (or deviation sensors) are typically employed to measure a vibrational response from the flow duct or ducts, and are typically located in positions upstream and downstream of the actuator. The two bypass sensors are connected to electronic instrumentation. The instrumentation receives signals from the two deviation sensors and processes the signals to derive a mass flow rate measurement or a density measurement, among other things. [0004] It is a problem that the one or more ducts may change over time, in which an initial factory calibration may change over time as the ducts are corroded, worn or otherwise changed. As a consequence, conduit stiffness can change from an initial representative stiffness value (or original measured stiffness value) during the life of the vibratory flow meter. [0005] Mass flow rate (w) can be generated according to the equation: n / = FCF * [Δ / -Δ / „] (1) [0006] Flow calibration factor (FCF) is required to determine a mass flow rate measurement (w) or a density measurement (p) of a fluid. The term (FCF) comprises a flow calibration factor and typically comprises a geometric constant (G), Young's modulus (E), and a moment of inertia (I), where: FCF = G * E * I (2 ) [0007] The geometric constant (G) for the vibratory flow meter is fixed and does not change. The Young Modulus constant (E) likewise does not change. In contrast, the moment of inertia (I) can change. One way to track changes in moment of inertia and FCF of a vibrating flow meter is by monitoring the stiffness and residual flexibility of the flow meter ducts. There are growing demands for ever better ways to track changes in the FCF, which affects the fundamental performance of a vibratory flow meter. [0008] What is needed is a technique for tracking the FCF on a dual trigger flow meter to check the flow meter performance with improved accuracy. SUMMARY OF THE INVENTION [0009] A vibrating flow meter for checking rigidity is provided according to an order modality. The vibrating flow meter for checking meter stiffness includes a flow meter assembly including one or more flow tubes and first and second bypass sensors; first and second actuators configured to vibrate the one or more flow tubes; and meter electronics coupled to the first and second bypass sensors and coupled to the first and second actuators, with the meter electronics being set up to vibrate the flow meter assembly in a primary vibration mode using the first and second actuators, determine first and second second primary mode currents from the first and second drivers for the primary vibration mode and determining the first and second primary mode response voltages generated by the first and second bypass sensors for the primary vibration mode, generate a meter stiffness value using the first and second currents in primary mode and the first and second response voltages in the primary mode, and verify the correct operation of the vibratory flow meter using the meter stiffness value. [0010] A method for checking the meter for a vibrating flow meter is provided according to an order modality. The method includes vibrating a flow meter assembly of the vibrating flow meter in a primary vibration mode using a first driver and at least a second driver; determining first and second primary mode currents of the first and second drivers for the primary vibration mode and determining first and second response voltages in the primary mode of the first and second offset sensors for the primary vibration mode; generate a meter stiffness value using the first and second currents in the primary mode and the first and second response voltages in the primary mode; and verify correct operation of the vibratory flow meter using the meter stiffness value. ASPECTS [0011] Preferably, the first and second currents in primary mode comprise commanded current levels. [0012] Preferably, the first and second primary currents comprise measured current levels. [0013] Preferably, the second driver is not correlated with the first driver. [0014] Preferably, the meter electronics is further configured to compare the meter stiffness value to a predetermined stiffness range, generate a check indication for the vibrating flow meter if the meter stiffness value falls within the range of predetermined stiffness, and generate a verification failure indication for the vibratory flow meter if the meter stiffness value does not fall within the predetermined stiffness range. [0015] Preferably, the meter electronics is further configured to vibrate the flow meter assembly in a secondary vibration mode using the first and second actuators, to determine first and second secondary mode currents of the first and second actuators for the vibration mode secondary and determine first and second secondary mode response voltages from the first and second bypass sensors to the secondary vibration mode, and generate the meter stiffness value using one or both of the first and second primary currents and the first and second second primary response voltages or the first and second secondary current currents and the first and second secondary response voltages. [0016] Preferably, the meter electronics is further configured to generate a residual meter flexibility value using the first and second currents in the primary mode and the first and second response voltages in the primary mode. [0017] Preferably, the meter electronics is further configured to generate a residual meter flexibility value using the first and second currents in the primary mode and the first and second response voltages in the primary mode, to compare the residual meter flexibility value. to a predetermined residual flexibility range, and generate a check indication for the vibratory flow meter if the residual meter flexibility value falls within the predetermined residual flexibility range, and generate a check failure indication for the flow meter vibrating if the meter residual flexibility value does not fall within the predetermined residual flexibility range. [0018] Preferably, the meter electronics is further configured to vibrate the flow meter assembly in a secondary vibration mode using the first and second actuators, determine first and second secondary mode currents of the first and second actuators for the vibration mode secondary and determine first and second response voltages in the secondary mode of the first and second deviation sensors for the secondary vibration mode, and generate a residual meter flexibility value using one or both of the first and second currents in the primary mode and the first and second response voltages in primary mode or the first and second currents in secondary mode and the first and second response voltages in secondary mode. [0019] Preferably, the first driver current and the second driver current comprise commanded current levels. [0020] Preferably, the first driver current and the second driver current comprise measured current levels. [0021] Preferably, the first response voltage and the second response voltage comprise substantially maximum response voltages quantified by the first and second bypass sensors. [0022] Preferably, the second driver is not correlated with the first driver. [0023] Preferably, verifying the correct operation of the vibrating flow meter comprises comparing the meter stiffness value to a predetermined stiffness range, generating a verification indication for the vibrating flowmeter if the meter stiffness value falls within the predetermined stiffness range, and generate a verification failure indication for the vibratory flow meter if the meter stiffness value does not fall within the predetermined stiffness range. [0024] Preferably, it still comprises vibrating the flow meter assembly in a secondary vibration mode using the first driver and at least the second driver, determining first and second secondary mode currents of the first and second drivers for the vibration mode secondary and determine first and second response voltages in secondary mode of first and second deviation sensors for secondary vibration mode, and generate the meter stiffness value using one or both of the first and second currents in primary mode and the first and second second primary response voltages or the first and second secondary current currents and the first and second secondary response voltages. [0025] Preferably, it still comprises generating a residual meter flexibility value using the first and second currents in a primary way and the first and second response voltages in a primary way. [0026] Preferably, it still comprises generating a residual meter flexibility value using the first and second currents in a primary way and the first and second response voltages in a primary way, comparing the residual meter flexibility value to a residual flexibility range predetermined, generating a check indication for the vibrating flow meter if the residual flexibility meter value falls within the predetermined residual flexibility range, and generating a check failure indication for the vibrating flow meter if the residual flexibility value meter does not fall within the predetermined residual flexibility range. [0027] Preferably, it still comprises vibrating the flow meter assembly in a secondary vibration mode using the first driver and at least the second driver, determining first and second secondary mode currents of the first and second drivers for the vibration mode secondary and determine first and second response voltages in secondary mode of first and second deviation sensors for secondary vibration mode, and generate a residual meter flexibility value using one or both of the first and second currents in the primary mode and the first and second response voltages in primary mode or the first and second currents in secondary mode and the first and second response voltages in secondary mode. BRIEF DESCRIPTION OF THE DRAWINGS [0028] The same reference number represents the same element in all drawings. The drawings are not necessarily to scale. [0029] Figure 1 shows a vibratory flow meter for meter verification according to an embodiment of the invention. [0030] Figure 2 shows meter electronics for checking the meter of the vibrating flow meter according to an embodiment of the invention. [0031] Figure 3 is a graph of frequency response showing the effect of residual flexibility. [0032] Figure 4 represents a vibrating flow meter having curved flow tubes in which the two parallel curved flow tubes are vibrated in a bending mode. [0033] Figure 5 represents the vibratory flow meter in which the two parallel curved flow tubes are vibrated in a torsion mode (or Coriolis). [0034] Figure 6 is a flow chart of a meter verification method for a vibratory flow meter according to an embodiment of the invention. [0035] Figure 7 is a flow chart of a meter verification method for a vibratory flow meter according to an embodiment of the invention. [0036] Figure 8 is a flow chart of a meter verification method for a vibratory flow meter according to an embodiment of the invention. DETAILED DESCRIPTION OF THE INVENTION [0037] Figures 1-8 and the following description describe specific examples to teach those skilled in the art how to make and use the best mode of the invention. For the purpose of teaching inventive principles, some conventional aspects have been simplified or omitted. Those skilled in the art will appreciate variations of these examples that are within the scope of the invention. Those skilled in the art will appreciate that the aspects described below can be combined in various ways to form multiple variations of the invention. As a result, the invention is not limited to the specific examples described below, but only by the claims and their equivalents. [0038] Figure 1 shows a vibratory flow meter 5 for meter verification according to an embodiment of the invention. The flow meter 5 comprises a flow meter set 10 and meter electronics 20 coupled to the flow meter set 10. The flow meter set 10 responds to the mass flow rate and density of a process material. The meter electronics 20 is connected to the flow meter assembly 10 via wires 100 to provide density, mass flow rate, and temperature information about a communication link 26, as well as other information. A Coriolis flow meter structure is described although it is apparent to those skilled in the art that the present invention could also be operated as a vibration tube densitometer. [0039] Flow meter set 10 includes manifolds 150 and 150 ', flanges 103 and 103' having flange necks 110 and 110 ', parallel flow tubes 130 and 130', first and second actuators 180L and 180R, and first and bypass sensors 170L and 170R. The first and second actuators 180L and 180R are spaced on one or more flow tubes 130 and 130 '. In addition, in some embodiments the flow meter assembly 10 may include a temperature sensor 190. Flow tubes 130 and 130 'have two essentially straight inlet legs 131 and 131' and outlet legs 134 and 134 'that converge into direction for you on the flow tube mounting blocks 120 and 120 '. Flow tubes 130 and 130 'fold in two symmetrical locations along their lengths and are essentially parallel from the beginning to the end of their length. The reinforcement bars 140 and 140 'serve to define the geometric axis W and the geometric axis W substantially parallel around which each flow tube oscillates. [0040] The side legs 131, 131 'and 134, 134' of the flow tubes 130 and 130 'are fixedly fixed to the flow tube assembly blocks 120 and 120' and these blocks, in turn, are fixed fixedly to the collectors 150 and 150 '. This provides a continuous closed material path through the flow meter assembly 10. [0041] When flanges 103 and 103 ', having holes 102 and 102' are connected, via the inlet end 104 and the outlet end 104 'on a process line (not shown) that carries the process material that is being measured, material enters the end 104 of the meter through an orifice 101 on the flange 103 and is conducted through the manifold 150 to the flow tube assembly block 120 having a surface 121. Within the manifold 150 the material is divided and directed through flow tubes 130 and 130 '. At the outlet of flow tubes 130 and 130 ', the process material is recombined in a single stream inside the collector 150' and is, however, directed to the outlet end 104 'connected by flange 103' having screw holes 102 'to the process line (not shown). [0042] Flow tubes 130 and 130 'are selected and appropriately mounted to flow tube assembly blocks 120 and 120' in order to have substantially the same mass distribution, moments of inertia, and Young's modulus on the axes bending patterns WW and WW, respectively. These geometric bending axes go through the reinforcement bars 140 and 140 '. Since the Young Modules of the flow tubes change with temperature, and this change affects the flow and density calculation, the resistive temperature detector (RTD) 190 is mounted to the flow tube 130 ', to continuously measure the temperature of the flow tube. The temperature dependent voltage appearing through RTD 190 can be used by meter electronics 20 to compensate for the change in the elastic module of flow tubes 130 and 130 'due to any changes in temperature flow tube. The RTD 190 is connected to meter electronics 20 over wire 195. [0043] The first and second actuators 180L and 180R are spaced apart and are located in upstream and downstream portions of flow tubes 130 and 130 '. An appropriate trigger signal is provided to the first and second actuators 180L and 180R by meter electronics 20 via wires 185L and 185R. The first and second actuators 180L and 180R can comprise any of many well-known arrangements, such as a magnet mounted to flow tube 130 'and an opposite coil mounted to flow tube 130 and through which an alternating current is passed to vibrate both flow tubes 130, 130 '. Depending on the polarity of the drive signal applied to the driver coil component, a magnetic field can be generated that adds to or opposes the magnetic field of the driver magnet component. As a result, the polarity of the drive signal can push the coil and magnet component away, causing the drive to expand, or it can pull the coil and magnet component together, causing the driver to contract. Expansion or contraction of the actuator can move flow tubes 130 and 130 'far or close. [0044] Flow tubes 130 and 130 'can be driven by the first and second actuators 180L and 180R in any desired vibration mode. In a bending mode (see Figure 4 and the accompanying discussion), flow tubes 130 and 130 'can be driven by a bending mode trigger signal or signals in opposite directions on their respective bending geometry axes W and W in which the first out-of-phase bending mode of the vibratory flow meter is named 5. In a bending mode vibration, the first and second 180L and 180R actuators are triggered by the trigger signal or signals to operate synchronously and in phase, with the first and second actuators 180L and 180R expanding simultaneously to push the flow tubes 130 and 130 'apart, and then they will contract simultaneously to pull the flow tubes 130 and 130' together. [0045] In torsional vibration mode (see Figure 5 and the accompanying discussion), the first and second 180L and 180R actuators are activated by a torsion actuation signal mode to operate 180 degrees out of phase, with an expanding and the other driver simultaneously contracting, in which the upstream portion of the flow tubes 130 and 130 'will move apart, while the downstream portion will move together in an example in time and then the movement is reversed. As a result, flow tubes 130 and 130 'include central nodes N and N', in which flow tubes 130 and 130 'vibrate (i.e., twist) around central nodes N and N'. [0046] Meter electronics 20 receives the RTD temperature signal on wire 195, and the apparent left and right speed signals on wires 165L and 165R, respectively. Meter electronics 20 produces the apparent trigger signal on wires 185L and 185R to the first and second actuators 180L and 180R and vibrates flow tubes 130 and 130 '. Meter electronics 20 processes the left and right velocity signals and the RTD signal to compute the mass flow rate and material density passing through the flow meter assembly 10. This information, along with other information, is applied by meter electronics 20 over communication link 26 to an external device or devices. [0047] Flow meters are inevitably affected by operation, the operating environment, and the flow material flowing through the flow meter. As a result, the meter stiffness can change over time, such as due to erosion by the flow material, and corrosion, for example. Changes in meter stiffness can result in erroneous flow rate measurements. Consequently, operating the vibrating flow meter using a flow calibration factor value that was obtained at the time of manufacture can result in increasingly accurate measurements by the vibrating flow meter. [0048] Figure 2 shows meter electronics 20 for meter verification of the vibratory flow meter 5 according to an embodiment of the invention. The meter electronics 20 can include an interface 201 and a processing system 203. The meter electronics 20 receives and processes first and second sensor signals from the flow meter assembly 10, such as bypass sensor signals from the first and second sensors deviation 170L, 170R. [0049] Interface 201 transmits a trigger signal or trigger signals to the 180L and 180R triggers via the 165L and 165R wires. Interface 201 can transmit a drive signal to the two drivers 180L and 180R via wires 165L and 165R. Alternatively, interface 201 can transmit two separate drive signals to the 180L and 180R drives via the 165L and 165R wires. The two separate trigger signals may be the same or may differ from each other. [0050] Alternatively, interface 201 can transmit a trigger signal or signals and a meter check excitation signal or signals to the 180L and 180R actuators. As a result, meter electronics 20 can inject additional signals (i.e., meter check excitation signals) into the 180L and 180R drives for the meter check process. Primary mode currents and secondary mode currents can then be measured for the 180L and 180R actuators due to the meter verification excitation signals. [0051] Interface 201 receives the first and second sensor signals from the first and second bypass sensors 170L and 170R via wires 100 of Figure 1. Interface 201 can perform any necessary or desired signal conditioning, as any mode , amplification, temporary storage, etc. Alternatively, some or all of the signal conditioning can be performed on the 203 processing system. [0052] In addition, interface 201 can enable communications between meter electronics 20 and external devices, such as via communication link 26, for example. Interface 201 can transfer measurement data to external devices via communication link 26 and can receive commands, updates, data, and other information from external devices. Interface 201 may be capable of any form of electronic, optical or wireless communication. [0053] Interface 201, in one embodiment, includes a digitizer (not shown), in which the sensor signal comprises an analog sensor signal. The digitizer samples and digitizes the analog sensor signal and produces a digital sensor signal. The interface / digitizer can also effect any necessary decimation, in which the digital sensor signal is decimated in order to reduce the amount of signal processing required and to reduce the processing time. [0054] Processing system 203 conducts operations of meter electronics 20 and processes flow measurements from flow meter set 10. Processing system 203 performs an operational routine 210 and thereby processes flow measurements in order to produce one or more flow characteristics (or other flow measurements). [0055] The 203 processing system may comprise a general purpose computer, a microprocessing system, a logic circuit, or some other general purpose or customized processing device. Processing system 203 can be distributed among multiple processing devices. Processing system 203 can include any form of integral or independent electronic storage medium, such as storage system 204. Storage system 204 can be coupled with processing system 203 or can be integrated into processing system 203. [0056] The storage system 204 can store information used to operate the vibrating flow meter 5, including information generated during the operation of the vibrating flow meter 5. The storage system 204 can store one or more signals that are used to vibrate flow tubes 130 and 130 'and which are provided to the first and second actuators 180L and 180R. In addition, storage system 204 can store vibrational response signals generated by the first and second bypass sensors 170L and 170R when flow tubes 130 and 130 'are vibrated. [0057] The one or more trigger signals may include trigger signals to generate a primary vibration mode and a secondary vibration mode, together with the meter verification excitation signals (tones), for example. The primary vibration mode in some embodiments may comprise a vibration bending mode and the secondary vibration mode in some embodiments may comprise a torsional vibration mode. However, other or additional modes of vibration are contemplated and are within the scope of the description and claims. [0058] Meter electronics 20 can control the first and second actuators 180L and 180R to operate in a correlated manner, in which the first and second actuators 180L and 180R receive actuation signals that are substantially identical in the actuation signal phase, trigger signal frequency, and trigger signal amplitude. If the first and second actuators 180L and 180R are operated in a correlated manner, then the stiffness and residual flexibility values comprise [2X1] vectors or matrices. [0059] Alternatively, meter electronics 20 can control the first and second actuators 180L and 180R to operate in an unrelated manner, in which the first and second actuators 180L and 180R may differ during operation in one or more of the signal phase trigger frequency, trigger signal frequency, or trigger signal amplitude. If the first and second actuators 180L and 180R are operated in an unrelated manner, then the residual stiffness and flexibility values comprise [2 X 2] vectors or matrices, generating two additional diagnoses for each residual stiffness and flexibility. [0060] The storage system 204 may store a primary mode current 230. The primary mode drive current 230 may comprise a drive or excitation current or currents used to generate the primary vibration mode in the flow meter assembly 10 as well as the meter check signals. The primary drive current 230 may comprise currents from one or both of the first and second actuators 180L and 180R. In some embodiments, the storage system 204 can store first and second currents in primary mode 230 corresponding to the first and second actuators 180L and 180R. The first and second primary mode currents 230 may comprise currents commanded for the primary vibration mode (that is, the currents set for the first and second actuators 180L and 180R) or may comprise currents measured from the primary vibration mode (that is, currents measured as actually flowing through the first and second actuators 180L and 180R). [0061] The storage system 204 can store a secondary mode current 236. The secondary mode current 236 can comprise a drive or excitation current or currents used to generate the secondary vibration mode in the flow meter assembly 10 as well as the meter check signs. The secondary mode stream 236 may comprise currents from one or both of the first and second actuators 180L and 180R. In some embodiments, the storage system 204 can store first and second streams in a secondary mode 236 corresponding to the first and second actuators 180L and 180R. The first and second secondary mode currents 236 may comprise currents commanded for the secondary vibration mode or may comprise currents measured from the secondary vibration mode. [0062] The storage system 204 can store a primary mode response voltage 231. The primary mode response voltage 231 may comprise sinusoidal voltage signals or voltage levels generated in response to the primary vibration mode. The primary response voltage 231 may comprise voltage signals or voltage levels (such as peak voltages) generated by one or both of the first and second offset sensors 170L and 170R. The response voltage will also include the responses in the meter check excitation signal frequencies. In some embodiments, the storage system 204 can store first and second response voltages in a primary manner 231 corresponding to the first and second offset sensors 170L and 170R. [0063] The storage system 204 can store secondary mode response voltage 237. Secondary mode response voltage 237 may comprise sinusoidal voltage signals or voltage levels generated in response to the secondary vibration mode. The secondary mode response voltage 237 may comprise voltage signals or voltage levels (such as peak voltages) generated by one or both of the first and second offset sensors 170L and 170R. The response voltages will also include the responses in the meter check excitation signal frequencies. In some embodiments, the storage system 204 can store first and second response voltages in a secondary manner 237 corresponding to the first and second offset sensors 170L and 170R. [0064] The storage system 204 can store a 216 meter stiffness value. The 216 meter stiffness value comprises a stiffness value that is determined from vibrational responses generated during operation of the vibratory flow meter 5. The stiffness value 216 meter can be generated in order to verify correct operation of the vibratory flow meter 5. The 216 meter stiffness value can be generated for a verification process, in which the 216 meter stiffness value serves the purpose of verifying operation correct and accurate vibratory flow meter 5. [0065] The 216 meter stiffness value can be generated from information or measurements generated during a primary vibration mode, during a secondary vibration mode, or both. Likewise, the residual flexibility value can be generated from the information or measurements generated during a primary vibration mode, during a secondary vibration mode, or both. If the meter stiffness value 216 is generated using information from either primary or secondary modes, then the meter stiffness value 216 can be more accurate and reliable than if only one vibration mode is used. When both the primary and secondary vibration modes are used, then a stiffness vector or matrix can be generated for each mode. Likewise, when both primary and secondary vibration modes are used, then a vector or residual flexibility matrix can be generated for each mode. [0066] The vibrational response of a flow meter can be represented by an open circuit, second order drive model, comprising: Mx + Cx + Kx = f (t) where f is the force applied to the system, M is a mass parameter of the system, C is a damping parameter, and K is a stiffness parameter. The term x is the physical displacement distance of the vibration, the term is the velocity of the flow tube displacement, and the term x is the acceleration. This is commonly referred to as an MCK model. This formula can be rearranged in the form: (ms2 + cs + k) X (s) = F (s) + (ms + c) x (O) + mx (0) [0067] Equation (4) can be further manipulated in a form of transfer function, while ignoring the initial conditions. The result is: [0068] Another manipulation can transform equation (5) into a form of first-order pole-residue frequency response function comprising: where À is the pole, R is the residue, the term (j) comprises the square root of - 1, and ω is the frequency of circular excitation in radians per second. [0069] The system parameters comprising the natural / resonant frequency (ωn), the damped natural frequency (ωd), and the decay characteristic (Ç) are defined by the pole. [0070] The stiffness parameter (K), the damping parameter (C), and the mass parameter (M) of the system can be derived from the pole and residue. [0071] Consequently, the stiffness parameter (K), the mass parameter (M), and the damping parameter (C) can be calculated based on a good estimate of the pole (A) and the residue (R). [0072] The pole and residue are estimated from the measured frequency response functions (FRFs). The pole (À) and the residue (R) can be estimated using an iterative computational method, for example. [0073] The response close to the activation frequency is composed primarily of the first term of equation (6), with the complex conjugate term contributing only a small, almost constant, "residual" part of the response. As a result, equation (6) can be simplified to: [0074] In equation (13), the term H (ω) is the FRF measured. In this derivation, H is composed of a displacement output divided by a force input. However, with the voice coil deviations typical of a Coriolis flowmeter, the measured FRF (ie, an H term) is in terms of speed divided by force. However, equation (13) can be transformed into the form: [0075] Equation (14) can also be rearranged easily soluble for the pole (À) and the residue (R). [0076] Equations (15) - (17) form an overdetermined system of equations. Equation (17) can be computationally solved in order to determine the pole (À) and the residue (R) of the speed / FRF of force (H). The terms H, R, and À are complex. [0077] Correlated triggers can be used in the primary mode, the secondary mode, or in multiple modes. In some modalities, the triggers are correlated and two FRFs can be measured in each of the primary or secondary modes. Consequently, four FRFs can be measured: 1) a FRF from the left trigger 180L to the left offset 170L, 2) a FRF from the left trigger 180L to the right offset 170R), 3) a FRF from the right trigger 180R to the left offset 170L, and 4) a FRF from the trigger right 180R to the right deviation 170R. [0078] Recognizing that FRFs share a common pole (À), but separate residues (RL) and (RR), the two measurements can be advantageously combined to result in a more robust pole and residue determination. [0079] Equation (18) can be solved in any number of ways. In one embodiment, the equation is solved using a recursive least squares approach. In another modality, the equation is solved using a pseudo-inverse technique. In yet another embodiment, because all measurements are available simultaneously, a standard Q-R decomposition technique can be used. The Q-R decomposition technique is discussed in Modern Control Theory, William Brogan, copyright 1991, Prentice Hall, pp. 222-224, 168-172. [0080] After equation (18) is iteratively processed to a satisfactory convergence, then the pole and residue can be used to generate stiffness values according to equations (10) and (11). With trigger inputs that are correlated, Equations (10) and (11) can be used to generate stiffness values between the triggers and the left offset and the triggers and the right offset. In this case, the residual stiffness and flexibility values for each mode are of size [2X1], [0081] Equations (10) and (11) can also be used to generate stiffness K values between each 170L and 170R deviation sensor and each 180L and 180R actuator. Generated stiffness values can include a (auto) KLL stiffness value generated for the left bypass sensor using the left driver, a KRL (crossed) stiffness value generated for the 170R right bypass sensor using the left drive 180L, a ( cross) KLR stiffness value generated for the left 170L bypass sensor using the right 180R drive, and a (auto) KRR stiffness value generated for the 170R right bypass sensor using the right 180R drive. The two (auto) terms can be the same due to the symmetry of the structure. The terms (crossed) will always be the same due to reciprocity, that is, inserting a vibration at point A and measuring the response at point B will generate the same result of vibrational response as inserting the vibration at point B and measuring the response at point A. The result is an X stiffness matrix: [0082] The stiffness matrix X can be stored as the stiffness value of meter 216. [0083] The storage system 204 can store a baseline gauge stiffness 209 that is programmed in the gauge electronics 20. In some embodiments, the baseline gauge stiffness 209 can be programmed in the gauge electronics 20 in the factory (or other manufacturing facility), such as under construction or sale of the vibratory flow meter 5. Alternatively, the baseline meter stiffness 209 can be programmed into meter electronics 20 during a field calibration operation or other operation calibration or re-calibration. However, it should be understood that the baseline 209 meter rigidity in most modalities will not be exchangeable by a user or operator or during field operation of the vibratory flow meter 5. [0084] If the stiffness value of meter 216 is substantially the same as the stiffness of baseline meter 209, then it can be determined that the vibratory flow meter 5 is relatively unchanged under the condition when it was manufactured, calibrated , or when the vibrating flow meter 5 was last recalibrated. Alternatively, where the meter stiffness value 216 significantly differs from the baseline meter stiffness 209, then it can be determined that the vibratory flow meter 5 has been degraded and may not be operating precisely and reliably, such as where the meter vibratory flow rate 5 has changed due to metal fatigue, corrosion, erosion due to a flow, or other operating condition or effect. [0085] The storage system 204 can store a predetermined stiffness range 219. The predetermined stiffness range 219 comprises a selected range of acceptable stiffness values. The predetermined stiffness range 219 can be chosen to count for normal wear and tear on the vibratory flow meter 5. The predetermined stiffness range 219 can be chosen to count for corrosion or erosion on the vibratory flow meter 5. [0086] In one embodiment, the storage system 204 stores a residual flexibility value of meter 218. The residual flexibility value of meter 218 comprises a residual flexibility value that is determined from vibrational responses generated during operation of the vibratory flow meter. 5. Determining residual flexibility only requires additional curve adjustment during the stiffness calculation, it requires only an additional iteration of the algorithm or adjustment process for equation (18) in some modalities. Residual flexibility has the same shape as the stiffness matrix (see equation (19) and the accompanying discussion). [0087] Figure 3 is a graph of three FRFs showing the effect of residual flexibility, plotted as amplitude (A) against frequency (f). The peak of FRFi amplitude occurs at the first resonance frequency ωi. The FRF2 and FRF3 amplitude peaks occur at the resonance frequencies ω2 and CÜ3. It can be seen from the graph that FRF2 and FRF3 have tails that affect the FRF1 amplitude values, including the resonance frequency ωi. This effect of the FRF2 and FRF3 tails on vibration at the resonance frequency ωi is called residual flexibility. Similarly, FRF2 shows the effect of residual flexibility of the FRF3 tail. [0088] Referring again to Figure 2, the residual flexibility value of meter 218 can be generated in order to verify correct operation of the vibratory flow meter 5. The residual flexibility value of meter 218 can be generated for a process of verification, where the residual flexibility value of meter 218 serves the purpose of verifying correct and accurate operation of the vibratory flow meter 5. When both primary and secondary vibration modes are used, then a stiffness vector or matrix can be generated for each mode. Likewise, when both primary and secondary vibration modes are used, then a vector or residual flexibility matrix can be generated for each mode. [0089] The above development assumed that the four FRFs are measured simultaneously, ignoring the need to hold the meter in resonance, a normal flow measurement operating condition. The need to sustain resonance complicates the issue that four independent FRFs cannot be measured simultaneously in order to solve the problem. Preferably, when computing FRFs, the aggregate effect of both triggers on the output can be measured. [0090] In this equation, the term x'Lreferences to the speed in the selected deviation due to the force in the left drive 180L and the term x'Refers to speed in the selected deviation due to the force in the right drive 180R. This quantity cannot be directly measured. Preferably, only the sum of the two trigger effects on the deviations is measured. However, this amount will be used in the theoretical development that follows. The total effect FRF defined in equation (20) is insufficient to solve for the four desired residues. However, it can be resolved with one more information unit, the FRF between the driving forces. [0091] To see how these two pieces of information are enough to solve the system model, the definition of the frequency response works for an arbitrary “D” trigger is used to define: [0092] Using linearity, the effects of equation (22) can be added as applied to the left and right triggers. [0093] Both sides of equation (23) can be divided by any nonzero quantity. For example, equation (23) can be divided by the sum of the left and right trigger forces, which are non-zero since the structure is being excited. [0094] The left side of equation (24) can be directly measured. Right side characterizes the individual FRFs that are related to the pole and residues. The force ratios of equation (21) can be used to transform equation (24). [0095] Note that the terms y, and yR are defined in the following equations. Intuitively, however, they are the fraction of the total force applied to a particular driver. If the two triggers are activated equally, the values of y, and yK are both 0.5. If a trigger is triggered completely, they are 0 and 1. In general, the terms y, and yK can be complex numbers with a magnitude and phase relationship and are calculated from FRFs of the measured force (or electric trigger current). [0096] Substituting equations (20), (25), and (26) in equation (24) we obtain: [0097] The last step is to replace the H, and HR of system FRFs with pole residue models and reorganize the terms. [0098] The gamma and FRF values added in equation (28) are derived from measured data and are both frequency functions. This basic equation can be expanded over five tones that can be activated to check the meter and over the two deviations, granting a system with ten equations and five unknowns. For clarity, this expansion is shown in equation (29). Since this system of equations was used to solve for the system parameters (R ,,. RllrRl (l, Rlil {, À), extracting the stiffness vector or matrix is a trivial matter. [0099] The pole-residue model can be mc of simple residual flexibility to consider for the aggregate effect of the other modes. This effect is assumed to be constant frequently within local measurements close to the drive mode. This will be true if all other modes are of higher frequency than the drive mode and are far enough away to be treated as pure rigidity. The modified pole-waste model is: [00100] The model can be converted to a speed FRF and the terms can be reorganized to obtain the most readily solvable form: [00101] This model can be transformed into: [00102] The equation is no longer strictly linear in terms of the unknowns, R, À, and O. Instead, the terms ó and A are interdependent. This can be handled via a simple iterative solution technique. The model is first solved without residual flexibility (using equation (28)), then solved again using the original pole estimate for the <t> multipliers. This approach works reasonably well because the pole estimate is regularly insensitive to relatively small residual flexibility, much more than the residuals are. Since a new pole estimate is produced each time equation (32) is evaluated, the iterative technique can be repeated until the pole stabilizes (although a simple iteration may be sufficient in practice). In an in-line implementation, where system parameters are calculated for a number of sequential measurements in time, it may be more useful or efficient to seed the pole estimate with the value of the previous time window, instead of starting from the mark with the model without residual flexibility every time.ssss [00103] For real use, equation (32) can be expanded in the same way that equation (28) was expanded into equation (29). With the addition of residual flexibilities, which are also unique for each input / output pair, there are now ten equations and new unknowns. The system of equations is not nearly as overdetermined as the one in the original meter check, but experimental data has shown the results to still be relatively stable. These equations can be expanded by adding a low frequency term considering coil resistance. [00104] In development so far, the quantities of y (derived from the left-right force FRFs and essentially the fraction of the entire input force applied to a particular driver) have been treated as measured quantities. However, the distribution of input forces between the left and right actuators is a design parameter for the algorithm. FRFs are still measured to detect any variation that has been commanded (for example, due to the return of the EMF drive current return in the current amplifiers), but, in an ideal world, the quantities would be constant chosen for the procedure. The individual y values can be seen as components of a spatial force matrix F: [00105] Here rows correspond to different input locations and columns for different frequencies. The matrix can be remodeled to fit, however many frequencies (or triggers) are in use. The choice of I is not entirely arbitrary. For example, triggering all tones equally on each trigger will cause the matrix in equation (29) to be poorly conditioned for a least squares solution (since columns 1 and 2 and 3 and 4 would be identical). Increasing the spatial separation of the tones results in better numerical behavior when resolving, since matrix columns are more differentiated. In an effort to maximize this separation, the design parameters can comprise: [00106] Of course, the actual measurement values will not be the same as identified above. The tones are each given entirely to a particular trigger. The trigger tone is evenly divided between the triggers help to match the shape of the symmetrical trigger tone mode and minimize the excitation of residual flexibilities in other ways (twisting modes are not excited very well, although symmetrical modes of higher frequency can be ). [00107] In one embodiment, the storage system 204 stores a residual baseline meter flexibility 220. In some embodiments, the residual baseline flexibility meter 220 can be programmed in the meter electronics 20 at the factory (or other manufacturing facility), such as under construction or sale of the vibratory flow meter 5. Alternatively, the residual baseline flexibility meter 220 can be programmed into meter electronics 20 during a field calibration operation or other calibration operation. calibration or re-calibration. However, it should be understood that the baseline residual flexibility meter 220 in most modalities will not be exchangeable by a user or operator or during field operation of the vibratory flow meter 5. [00108] In one embodiment, the storage system 204 stores a predetermined residual flexibility range 221. The predetermined residual flexibility range 221 comprises a selected range of acceptable residual flexibility values. The predetermined residual flexibility range 221 can be chosen to count for normal wear and tear on the vibratory flow meter 5. The predetermined residual flexibility range 221 can be chosen to account for corrosion or erosion on the vibratory flow meter 5. [00109] In some embodiments, the storage system 204 stores a verification routine 213. The verification routine 213, when performed by the processing system 203, can perform a verification process for the vibratory flow meter 5. In some modalities , the processing system 203 when running check routine 213 is configured to generate a meter rigidity value. In some embodiments, the processing system 203 when performing check routine 213 is configured to generate a meter stiffness value and verify the correct operation of the vibrating flow meter using the meter stiffness value. In some embodiments, the processing system 203 when performing check routine 213 is configured to generate a residual meter flexibility value. In some embodiments, the processing system 203 when performing check routine 213 is configured to generate a residual meter flexibility value and verify the correct operation of the vibratory flow meter using the residual meter flexibility value. [00110] In some modalities, the 203 processing system when executing the verification routine 213 is configured to vibrate the flow meter set 10 in a primary vibration mode using the first and second actuators 180L and 180R, to determine first and second streams primary mode 230 of the first and second actuators 180L and 180R for the primary vibration mode and determine first and second primary mode response voltages 231 generated by the first and second offset sensors 170L and 170R for the primary vibration mode, generate a meter stiffness value 216 using the first and second primary mode currents 230 and the first and second primary response voltages 231, and verify correct operation of the vibrating flow meter 5 using the meter stiffness value 216. [00111] In some embodiments, the first and second currents in primary mode 230 comprise commanded current levels. Alternatively, in other embodiments the first and second primary currents 230 comprise measured current levels. [00112] In some embodiments, the second 180R driver is not correlated with the first 180L driver. Alternatively, in other embodiments the first and second 180L and 180R actuators are operated in a correlated manner. [00113] In some modalities, verifying correct operation of the vibratory flow meter 5 comprises comparing the stiffness value of meter 216 to a predetermined stiffness range 219, generating a verification indication for the vibrating flow meter 5 if the stiffness value meter 216 falls within the predetermined stiffness range 219, and generating a check failure indication for the vibratory flow meter 5 if the meter stiffness value 216 does not fall within the predetermined stiffness range 219. [00114] In some embodiments, the processing system 203 when executing the verification routine 213 is configured to vibrate the flow meter set 10 in a secondary vibration mode using the first and second actuators 180L and 180R, to determine first and second streams secondary mode 236 of the first and second actuators 180L and 180R for the secondary vibration mode and determine first and second secondary mode response voltages 237 of the first and second offset sensors 170L and 170R for the secondary vibration mode, and generate the meter stiffness value 216 using one or both of the first and second primary mode currents 230 and the first and second primary mode response voltages 231 or the first and second secondary mode currents 236 and the first and second response voltages of secondary mode 237. [00115] In some embodiments, the processing system 203 when executing the verification routine 213 is configured to generate a residual flexibility value of meter 218 using the first and second currents of primary mode 230 and the first and second response voltages of primary mode 231. [00116] In some embodiments, the processing system 203 when executing the verification routine 213 is configured to generate a residual flexibility value of meter 218 using the first and second currents of primary mode 230 and the first and second response voltages of primary mode 231, compare the residual flexibility value of meter 218 to a predetermined residual flexibility range 221, generate a check indication for the vibratory flow meter 5 if the residual flexibility value of meter 218 falls within the residual flexibility range predetermined 221, and generate a check indication for the vibrating flow meter 5 if the residual flexibility value of meter 218 does not fall within the predetermined residual flexibility range 221. [00117] In some modalities, the processing system 203 when executing the verification routine 213 is configured to vibrate the flow meter set 10 in a secondary vibration mode using the first and second actuators 180L and 180R, to determine first and second streams secondary mode 236 of the first and second actuators 180L and 180R for the secondary vibration mode and determine first and second secondary mode response voltages 237 of the first and second offset sensors 170L and 170R for the secondary vibration mode, and generate a residual flexibility value of meter 218 using one or both of the first and second primary mode currents 230 and the first and second primary mode response voltages 231 or the first and second secondary mode currents 236 and the first and second response voltages secondary mode 237. [00118] The verification of the operation is significant because it allows the meter electronics 20 to make a determination of stiffness in the field, without performing a real flow calibration test. It makes it possible to determine stiffness without an independent calibration test or other special equipment or special fluids. This is desirable because performing a flow calibration in the field is expensive, difficult and time consuming. [00119] Figure 4 represents a vibratory flow meter 5 having curved flow tubes 130 and 130 'in which of the two parallel curved flow tubes 130 and 130' are vibrated in a bending mode. The dashed lines in the Figure show the resting positions of the two flow tubes 130 and 130 '. In the bending mode, the tubes are vibrated with respect to the geometric bending axes W-W and W-W '. Consequently, the flow tubes 130 and 130 'periodically move away from each other (as shown by the curved arrows), then towards each other. It can be seen that each flow tube 130 and 130 are moved as a whole with respect to the flexural geometric axes V I- N and W-W. [00120] Figure 5 represents the vibratory flow meter 5 in which the two parallel curved flow tubes 130 and 130 'are vibrated in a torsion mode (or Coriolis). The dashed lines in the Figure show the resting positions of the two flow tubes 130 and 130 '. In torsion mode, the flow tubes at the left end in the Figure are being forced together, while at the right end in the Figure the flow tubes are being forced apart (in a Coriolis mode vibration, the torsion is induced by Coriolis forces in reaction to a drive vibration, but can be simulated or induced using two or more drivers to force torsional vibration). As a result, each flow tube is being twisted over a central point or node, such as nodes N and N '. Consequently, the ends of the flow tubes 130 and 130 '(or upstream and downstream portions) periodically move forward and away from each other (as shown by the curved arrows). [00121] Figure 6 is a flow chart 600 of a meter verification method for a vibratory flow meter according to an embodiment of the invention. In step 601, the flow meter assembly of the vibratory flow meter is vibrated in a primary vibration mode to generate a primary vibrational response. The primary vibrational response comprises electrical signals generated by the first and second bypass sensors 170L and 170R. [00122] In some embodiments, the primary vibration mode may comprise a flexion mode. However, it should be understood that the vibration could comprise other vibration modes, including a secondary vibration mode (see Figure 8 and the accompanying text below). It should also be understood that vibrating the flow meter assembly in the primary vibration mode may comprise vibrating in a predetermined vibration mode and substantially at a resonant frequency for the predetermined vibration mode. [00123] In step 602, the first and second currents in primary mode and the first and second response voltages in primary mode are determined. The first and second primary currents are electrical currents flowing through the two actuators. The first and second currents in primary mode may comprise controlled current values or may comprise measured current values for the two actuators. [00124] The first and second primary response voltages are the response voltages generated by the first and second bypass sensors. The first and second primary response voltages may comprise voltages generated by operating at or near the resonant frequency of the primary vibration mode. [00125] In step 603, a meter stiffness value is generated. The meter stiffness value can be generated using the first and second currents in a primary way and the first and second response voltages in a primary way, as previously discussed. [00126] In step 604, the newly generated meter stiffness value is compared to the baseline meter stiffness. If the meter stiffness value is within the predetermined stiffness range, then the method branches to step 605. If the meter stiffness value is not within the predetermined stiffness range, then the method branches to step 606. [00127] The comparison may comprise determining a difference between the meter stiffness value and the baseline meter stiffness, where the difference is compared to a predetermined stiffness range. The predetermined stiffness range may comprise a stiffness range that includes expected variations in movement accuracy, for example. The predetermined stiffness range can outline an amount of change in meter stiffness that is expected and is not significant enough to generate a verification failure determination. [00128] The predetermined stiffness range can be determined in any way. In one embodiment, the predetermined stiffness range may comprise a predetermined tolerance range and below the baseline gauge stiffness. Alternatively, the predetermined stiffness range can be derived from a standard deviation or confidence level determination that generates upper and lower range limits from baseline meter stiffness, or using other suitable processing techniques. [00129] In step 605, a verification indication is generated once the difference between the meter stiffness value and the baseline meter stiffness has fallen within the predetermined stiffness range. The gauge stiffness is determined, however, not to have changed significantly. No further action may need to be taken, although the result may be recorded, reported, etc. The statement may include an indication to the user that the baseline meter rigidity is still valid. The successful verification indication means that the baseline gauge stiffness is still accurate and useful and that the vibrating flowmeter is still operating precisely and reliably. [00130] In step 606, a verification failure indication is generated since the difference between the meter stiffness value and the baseline meter stiffness has exceeded the predetermined stiffness range. The meter stiffness is, however, determined to have changed significantly. As part of the verification failure indication, a software signal, visual indicator, message, alarm, or other indication can be generated to alert the user that the flow meter may not be acceptably accurate and reliable. In addition, the result can be recorded, reported, etc. [00131] Figure 7 is a flow chart 700 of a meter verification method for a vibratory flow meter according to an embodiment of the invention. In step 701, the flow meter assembly of the vibratory flow meter is vibrated in a primary vibration mode to generate a primary vibrational response, as previously discussed. [00132] In step 702, the first and second currents in primary mode and the first and second response voltages in primary mode are determined, as previously discussed. [00133] In step 703, a residual meter flexibility value is generated. The residual meter flexibility value can be generated using the first and second currents in a primary way and the first and second response voltages in a primary way, as previously discussed. [00134] In step 704, the residual flexibility value of a newly generated meter is compared to a baseline residual flexibility meter. If the residual meter flexibility value is within the predetermined residual flexibility range, then the method branches to step 705. If the residual meter flexibility value is not within the predetermined residual flexibility range, then the method branches to step 706 . [00135] The comparison may comprise determining a difference between the residual flexibility meter value and the baseline residual flexibility meter, where the difference is compared to the predetermined residual flexibility range. The predetermined residual flexibility range may comprise a residual flexibility range that includes expected variations in movement accuracy, for example. The predetermined residual flexibility range can outline an amount of change in residual meter flexibility that is expected and is not significant enough to generate the verification failure determination. [00136] The predetermined residual flexibility range can be determined in any way. In one embodiment, the predetermined residual flexibility range can comprise a predetermined tolerance above and below the baseline residual flexibility meter. Alternatively, the predetermined residual flexibility range can be derived from a standard deviation or confidence level determination that generates upper and lower range limits from the baseline residual flexibility meter, or using other appropriate processing techniques. [00137] In step 705, a verification indication is generated since the difference between the residual meter flexibility value and the baseline residual flexibility meter has fallen within the predetermined residual flexibility range. Residual meter flexibility is, however, determined not to have changed significantly. No further action may need to be taken, although the result may be recorded, reported, etc. The indication may include an indication to the user that the baseline residual flexibility meter is still valid. The successful verification indication means that the baseline residual flexibility meter is still accurate and useful and that the vibratory flow meter is still operating precisely and reliably. [00138] In step 706, the verification failure indication is generated since the difference between the residual meter flexibility value and the baseline residual flexibility meter has exceeded the predetermined residual flexibility range. The residual flexibility of the meter is, however, determined to have changed significantly. As part of the verification failure indication, a software flag, visual indicator, message, alarm, or other indication can be generated in order to alert the user that the flow meter may not be acceptably accurate and reliable. In addition, the result can be recorded, reported, etc. [00139] Figure 8 is a flow chart 800 of a meter verification method for a vibratory flow meter according to an embodiment of the invention. In step 801, the flow meter assembly of the vibratory flow meter is vibrated in a primary vibration mode to generate a primary vibrational response, as previously discussed. [00140] In step 802, the first and second currents in primary mode and the first and second response voltages in primary mode are determined, as previously discussed. [00141] In step 803, the flow meter assembly is vibrated in a secondary vibration mode to generate a vibrational response in a secondary mode. In some embodiments, the secondary vibrational response is generated simultaneously with the primary vibrational response. Alternatively, the secondary vibration mode can be switched with the primary vibration mode. [00142] In some embodiments, the primary vibration mode may comprise a flexion mode and the secondary vibration mode may comprise a torsion mode. However, it must be understood that the vibration could comprise other modes of vibration. [00143] In step 804, first and second drive currents in secondary mode and first and second response voltages in secondary mode are determined. [00144] In step 805, a meter stiffness value is generated, as previously discussed. The meter stiffness value can be generated using the first and second currents in the primary mode and the first and second response voltages in the primary mode. The meter stiffness value can be generated using the first and second secondary mode currents and the first and second secondary mode response voltages. The meter stiffness value can be generated using both the first and second currents in primary mode and the first and second response voltages in primary mode and the first and second currents in secondary mode and the first and second response voltages in mode secondary. [00145] In step 806, the newly generated meter stiffness value is compared to the baseline meter stiffness. If the meter stiffness value is within the predetermined stiffness range, then the method proceeds to step 808. If the meter stiffness value is not within the predetermined stiffness range, then the method branches to step 811, where a verification failure indication is generated. [00146] In step 808, a residual meter flexibility value is generated, as previously discussed. The residual meter flexibility value can be generated using the first and second currents in the primary mode and the first and second response voltages in the primary mode. The residual meter flexibility value can be generated using the first and second secondary mode currents and the first and second secondary mode response voltages. The residual meter flexibility value can be generated using both the first and second currents in primary mode and the first and second response voltages in primary mode and the first and second currents in secondary mode and the first and second response voltages in mode secondary. [00147] When both primary and secondary vibration modes are used, then a vector or stiffness matrix can be generated for each mode. Likewise, when both primary and secondary vibration modes are used, then a vector or residual flexibility matrix can be generated for each mode. [00148] In step 809, the newly generated residual meter flexibility value is compared to a baseline residual flexibility meter. If the residual meter flexibility value is within the predetermined residual flexibility range, then the method branches to step 810. If the residual meter flexibility value is not within the predetermined residual flexibility range, then the method branches to step 811 . [00149] In step 810, a verification indication is generated since the difference between the meter stiffness value and the baseline meter stiffness fell within the predetermined stiffness range and the difference between the residual flexibility value of the meter and the baseline residual flexibility meter fell within the predetermined residual flexibility range. However, it can be determined that both the baseline gauge stiffness and the residual baseline flexibility gauge have not changed significantly. No further action needs to be taken, although the result can be recorded, reported, etc. The indication may include an indication to the user that the baseline gauge stiffness and the residual baseline flexibility gauge are still valid. The successful verification indication means that the baseline gauge stiffness and the residual baseline flexibility gauge are still accurate and useful and that the vibratory flow meter is still operating precisely and reliably. [00150] In step 811, a verification failure indication is generated since either the difference between the meter stiffness value and the baseline meter stiffness exceeded the predetermined stiffness range, the difference between the residual meter flexibility and the baseline residual flexibility meter has exceeded the predetermined residual flexibility range, or both. One or both of the meter stiffness or the residual meter flexibility has changed significantly. As part of the verification failure indication, a software flag, visual indicator, message, alarm, or other indication may be generated to alert the user that the flow meter may not be acceptably accurate and reliable. In addition, the result can be recorded, reported, etc. [00151] The vibratory flow meter and method, according to any of the modalities, can be used to provide several advantages, if desired. The vibrating flow meter and method according to any of the modalities quantifies the flow meter stiffness using one or more vibration modes to generate an improved and more reliable meter stiffness value. The vibratory flow meter and method according to any of the modalities quantifies the residual flexibility of the flow meter using one or more vibration modes to generate an improved and more reliable meter stiffness value. The meter rigidity analysis method can determine whether the vibratory flow meter is still accurate and reliable. [00152] The detailed descriptions of the above modalities are not exhaustive descriptions of all the modalities contemplated by the inventors as being within the scope of the invention. In fact, those skilled in the art will recognize that certain elements of the modalities described above can be variablely combined or eliminated to create other modalities and such other modalities are within the scope and teachings of the invention. It will also be apparent to those skilled in the art that the modalities described above can be combined in whole or in part to create additional modalities within the scope and teachings of the invention. Consequently, the scope of the invention must be determined from the following claims.
权利要求:
Claims (15) [0001] 1. Vibratory flow meter (5) for meter verification, the vibratory flow meter (5) comprising: a flow meter assembly (10) including one or more flow tubes (130, 130 ') and first and second sensors deviation (170L, 170R); first and second actuators (180L, 180R) configured to vibrate the one or more flow tubes (130, 130 '); and meter electronics (20) coupled to the first and second bypass sensors (170L, 170R) and attached to the first and second actuators (180L, 180R), with the meter electronics (20) being configured to vibrate the flow meter assembly (10) in a primary vibration mode using the first and second drivers (180L, 180R), determine first and second primary mode currents (230) of the first and second drivers (180L, 180R) for the primary vibration mode, determine first and second primary response voltages (231) generated by the first and second bypass sensors (170L, 170R) for the primary vibration mode, characterized by the fact that it generates a meter stiffness value (216) using the first and second second primary mode currents (230) and the first and second primary response voltages (231), and verify correct operation of the vibratory flow meter (5) using the meter stiffness value (216). [0002] 2. Vibratory flow meter (5) according to claim 1, characterized by the fact that the meter electronics (20) is further configured to vibrate the flow meter assembly (10) in a secondary vibration mode using the first and second drivers (180L, 180R), determine first and second secondary mode currents (236) of the first and second drivers (180L, 180R) for secondary vibration mode and determine first and second response voltages in secondary mode (237) from the first and second bypass sensors (170L, 170R) to the secondary vibration mode, and generate the meter stiffness value (216) using one or both of the first and second primary currents (230) and the first and second primary mode response voltages (231) or secondary mode first and second currents (236) and secondary mode first and second response voltages (237). [0003] 3. Vibratory flow meter (5) according to claim 1, characterized by the fact that the meter electronics (20) is further configured to generate a residual meter flexibility value (218) using the first and second flow currents primary mode (230) and the first and second response voltages in primary mode (231). [0004] 4. Vibratory flow meter (5) according to claim 1, characterized by the fact that the meter electronics (20) is further configured to generate a residual meter flexibility value (218) using the first and second flow currents primary mode (230) and the first and second response voltages of primary mode (231), compare the residual meter flexibility value (218) with a predetermined residual flexibility range (221), generate a check indication for the meter vibratory flow rate (5) if the residual flexibility meter value (218) falls within the predetermined residual flexibility range (221), and generates a verification failure indication for the vibratory flow meter (5) if the residual meter flexibility (218) does not fall within the predetermined residual flexibility range (221). [0005] 5. Vibratory flow meter (5) according to claim 1, characterized by the fact that the meter electronics (20) is further configured to vibrate the flow meter assembly (10) in a secondary vibration mode using the first and second drivers (180L, 180R), determine first and second secondary mode currents (236) of the first and second drivers (180L, 180R) for secondary vibration mode and determine first and second response voltages in secondary mode (237) from the first and second bypass sensors (170L, 170R) to the secondary vibration mode, and generate a residual meter flexibility value (218) using one or both of the first and second primary modes (230) and the first and second primary response voltages (231) or the first and second secondary mode currents (236) and the first and second secondary response voltages (237). [0006] 6. Meter verification method for a vibrating flow meter, the method comprising: vibrating a vibrating flow meter flow meter assembly in a primary vibration mode using a first driver and at least a second driver; determining first and second primary mode currents of the first and second drivers for the primary vibration mode and determining first and second response voltages in the primary mode of the first and second offset sensors for the primary vibration mode; characterized by the fact that it also comprises generating a meter stiffness value using the first and second currents in a primary way and the first and second response voltages in a primary way; and verify correct operation of the vibratory flow meter using the meter stiffness value. [0007] Method according to claim 6, or the vibratory flow meter (5) according to claim 1, characterized by the fact that the first driver current and the second driver current comprise commanded current levels. [0008] Method according to claim 6, or the vibratory flow meter (5) according to claim 1, characterized by the fact that the first driver current and the second driver current comprise measured current levels. [0009] Method according to claim 6, or the vibratory flow meter (5) according to claim 1, characterized by the fact that the first response voltage and the second response voltage comprise substantially maximum response voltages quantified by the first and second bypass sensors. [0010] 10. Method according to claim 6, or the vibratory flow meter (5) according to claim 1, characterized by the fact that the second driver is not correlated with the first driver. [0011] 11. Method according to claim 6, characterized by the fact that verifying the correct operation of the vibratory flow meter comprises: comparing the meter stiffness value for predetermined stiffness range; generate a check indication for the vibrating flow meter if the meter stiffness value falls within the predetermined stiffness range; and generating a verification failure indication for the vibratory flow meter if the meter stiffness value does not fall within the predetermined stiffness range. [0012] 12. Method according to claim 6, characterized by the fact that it further comprises: vibrating the flow meter assembly in a secondary vibration mode using the first driver and, at least, the second driver; determining first and second secondary mode currents of the first and second drivers for the secondary vibration mode and determining first and second secondary response voltages of the first and second offset sensors for the secondary vibration mode; and generating the meter stiffness value using one or both of the first and second currents in primary mode and the first and second response voltages in primary mode or the first and second currents in secondary mode and the first and second response voltages in mode secondary. [0013] 13. Method according to claim 6, characterized in that it further comprises generating a residual meter flexibility value using the first and second currents in a primary way and the first and second response voltages in a primary way. [0014] 14. Method according to claim 6, characterized by the fact that it still comprises: generating a residual meter flexibility value using the first and second currents in a primary way and the first and second response voltages in a primary way; comparing the residual meter flexibility value to a predetermined residual flexibility range; generate a check indication for the vibrating flow meter if the residual meter flexibility value falls within the predetermined residual flexibility range; and generating a verification failure indication for the vibratory flow meter if the residual meter flexibility value does not fall within the predetermined residual flexibility range. [0015] 15. Method according to claim 6, characterized by the fact that it also comprises: vibrating the flow meter assembly in a secondary vibration mode using the first driver and, at least, the second driver; determining first and second secondary mode currents of the first and second drivers for the secondary vibration mode and determining first and second secondary response voltages of the first and second offset sensors for the secondary vibration mode; and generate a residual meter flexibility value using one or both of the first and second currents in primary mode and the first and second response voltages in the primary mode or the first and second currents in secondary mode and the first and second response voltages of secondary mode.
类似技术:
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同族专利:
公开号 | 公开日 MX2015015825A|2016-03-04| RU2617875C1|2017-04-28| US10612954B2|2020-04-07| US20200132529A1|2020-04-30| CN105283738A|2016-01-27| AU2014278632B2|2016-10-20| KR101948260B1|2019-05-10| EP3008428A1|2016-04-20| EP3008428B1|2021-02-24| US11029183B2|2021-06-08| HK1220756A1|2017-05-12| JP2016526667A|2016-09-05| MX346110B|2017-03-08| WO2014200672A1|2014-12-18| CA2914136A1|2014-12-18| CN105283738B|2020-08-21| US20160116319A1|2016-04-28| CA2914136C|2018-02-20| KR20160019546A|2016-02-19| BR112015030471A2|2017-07-25| AU2014278632A1|2015-12-03| SG11201510091SA|2016-01-28| JP6060317B2|2017-01-11|
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法律状态:
2018-11-06| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]| 2020-03-24| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]| 2020-08-04| B09A| Decision: intention to grant [chapter 9.1 patent gazette]| 2020-11-10| B16A| Patent or certificate of addition of invention granted [chapter 16.1 patent gazette]|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 20/05/2014, OBSERVADAS AS CONDICOES LEGAIS. |
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申请号 | 申请日 | 专利标题 US201361835159P| true| 2013-06-14|2013-06-14| US61/835,159|2013-06-14| US201361842105P| true| 2013-07-02|2013-07-02| US61/842,105|2013-07-02| PCT/US2014/038728|WO2014200672A1|2013-06-14|2014-05-20|Vibratory flowmeter and method for meter verification| 相关专利
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