A method for excitation in one or more directions and an excitation device

专利摘要:
A method for excitation in one or more directions, whereby a motor (2) supplies synchronous rotational output on two output shafts (4) in order to drive the excitation, wherein a cross member (6) provides the excitation whereby the cross member (6) engages the one (4.1) of the two output shafts (4) with a forced predefined torque in a first direction and engages the further output shaft (4.2) with the same size predefined torque in an opposed direction
公开号:DK202000008A1
申请号:DKP202000008
申请日:2020-01-06
公开日:2021-08-05
发明作者:Martin Thastum Jørgensen Janus；Ørbæk Laursen Asbjørn
申请人:R&D Test Systems As；
IPC主号:

专利说明:

DK 2020 00008 A1 1 A method for excitation in one or more directions, an excitation device, and a system for excitation of an item Field of invention When items are tested for durability and fatigue resistance, such as by being subject to excitation, applied with force in one or more directions, the force driving the excitation may become negative during load cycles. And this may lead to possible shifts in torque operational sign in gearings forming part of the drive chain from motor to item. An individual gear wheel shall thus go from being driven in one direction, receiving torque input from an axle whereon it is mounted, to receiving or providing a torque input to or from an adjacent toothed wheel, this torque being in an opposite direction. Due to usual backlash between gearwheels such shifts may cause significant force peeks and pulses within a gear train, causing both noise and un-desired stresses. These may translate to the item under test leading to less reliable test results, due to increase of noise levels on such measurables as reaction force from the item under test. The peeks and pulses also lead to increased wear on the gearing and stressfully high sounds in the vicinity of the excitation device. Especially if the item is of considerable size such as a construction element, an aeroplane wing or the blade of a wind turbine this problem is considerable, as direct drive by an electromotor is often not possible.
Prior art In prior art test benches for test of items such as wind turbine blades, the problem resides un-solved and little is done to remove the problem of torque sign changes through the gearings during load cycles.
Related art The following documents disclose related art. WO2018055075A1
DK 2020 00008 A1 2 WO2016045684A1 WO2004005879A1 DE102012205153A1 EP2522975A2
There is presented no real solution to the problem in any of these documents.
Thus, there is a need for a method and an apparatus which enables more reliable and more economic test rigs for cyclic loads of items having a springy nature and comprise considerable mass elements to be shifted during load cycles.
Also, an alternative to the prior art is desired.
Summary of the invention The object of the present invention is achieved by a method as defined in claim 1 and by a device with the features as defined in claim 8. The invention also comprises a system as defined in claim 15. Preferred embodiments are defined in the dependent subclaims explained in the following description and illustrated in the accompanying drawings.
A method for excitation in one or more directions, whereby a motor supplies synchronous rotational output on two output shafts in order to drive the excitation is provided wherein a cross member provides the excitation and wherein at least one gearing is inserted in the drive chain between the motor and the output shafts.
According to the invention a cross member engages the one of the two output shafts with a forced predefined torque in a first direction and engages the further output shaft with the same size predefined torque in an opposed direction.
In this way it is ensured, that when an item under cyclic load responds by reversing load direction in the drive chain, the reversed torque has to exceed the pre-defined static torque load, which is provided between
DK 2020 00008 A1 3 the two output shafts before any gearing in the drive chain between the motor and output shafts shall respond with pulses and force peaks or increased noise levels due to backlash movements of gear wheels.
According to the invention the cross member engages each of the output shafts through a gear arm and through a further gear arm respectively. In this way, the cross member may transmit a torque load in one direction by forcing the gear arm in one direction and forcing the further gear arm in an opposite direction, such that equal torque loads in opposed direction may be transmitted to the two output shafts. The cross member may be arranged as a beam element transmitting movement transversely to its length direction or it may be arranged as a shaft, which transmits rotational movement by revolving around a centre axis thereof. In either case, the cross member is preloaded prior to being connected to the gear arms.
In an embodiment, the predefined torque is loaded onto the cross member by twisting or rotating the cross member at a first end thereof with respect to an opposed second end thereof, and followingly fasten each end un-rotationally to each its gear arm in the twisted or rotated position. This is a very simple and straight forward way of ensuring that the predefined distortion torque is provided within the system.
In an embodiment two output shafts rotate synchronously and coaxially and extend in each their direction away from a centrally placed motor whereby the motor transmits the rotation to each output shaft through each its gearing. Usually, the motor to be used is an electric motor with rotational output provided on a throughgoing axel. The axles are thus both connected to a drive chain, such as a series of interlinked mechanical parts, which translates the output rotational movement at the two motor axles to a directional and cyclical force or movement, which is transmitted to the item under test.
DK 2020 00008 A1 4 In an embodiment the cross member is moved in a circular arch path transversely to a length direction thereof by the rotation of the two gear arms, and further, in extension of the gear arms, a driver arm, through an un-rotational connection to the cross member, transmits excitation movement to a push rod through a rotational connection between driver arm and a first end of a push rod. In this way the rotational movement of the cross member along a limited archway shall be translated to back and forth movement of the far end of a push rod. It is to be understood, that the push rod may not perform a linear movement in its length direction, but due to the fact that it is rotationally attached to the driver arm, the push rod cannot transmit torque from the driver arm.
It is preferred, that the push rod engages an item to be excited through a rotational connection at a second end of the push rod. In this way the push rod shall only transmit push and pull forces to the item to be excited.
In an embodiment, a second push rod excites the item simultaneously with a line of attack which is off set from a line of attack of the first push rod in order that a two-dimensional excitation pattern may be provided. Preferably the second push rod is connected to its own drive chain, which is shaped in the same fashion as the drive chain which drives the first push rod.
In a further aspect of the invention, an excitation device is provided, which has a motor and a gearing with synchronous rotational output on two output shafts, in order to force drive the excitation. Hereby it is preferred that a cross member is adapted to provide the excitation and that the cross member is connected to the one of the two output shafts with a forced predefined torque in a first direction and connected to the further of the two output shafts with the same size predefined torque in an opposed direction. In this fashion, it is ensured that a reversion of
DK 2020 00008 A1 the torque direction inside the gears does not occur during a load cycle. In an embodiment, the cross member is connected to each of the output shafts through each its gear arm. This allows the cross member 5 to work either as a beam or as a rotating shaft, and still transmit the predefined distortion torque to the shafts of the motor. Preferably the cross member is twisted a predefined angel around a length axis thereof at the one end with respect to an opposed end, and fastened un-rotationally to each its gear arm in each end in the twisted position. In an embodiment, the two output shafts are adapted to rotate synchronously and coaxially and extend in each their direction, away from a centrally placed motor, whereby the motor is adapted to transmit the rotation to each of the output shafts through each its gearing. Hereby the rotational output of the motor may be translated to increase torque and at the same time decrease speed of the output at each gearing.
In an embodiment the cross member is adapted to move in a circular arch path by the rotation of the two gear arms, as it is connected immovably to each gar arm, and in extension of the gear arms, a driver arm is connected un-rotationally to the cross member in order to transmit excitation movement to a push rod, whereby the push rod is connected to the driver arm through a rotational connection between driver arm and a first end of the push rod. Hereby it is ensured, that the push rod itself shall not transmit any torque into the driver arm, and that a predefined distortion in the cross member is also not transmitted in the direction of the item to be excited, but remains in the system comprising the motor, gears, output shafts gear arms and cross member.
DK 2020 00008 A1 6 Preferably the push rod is in engagement with an item to be excited through a rotational connection at a second end thereof. This ensures, that the push rod transmits only forces along its length axis, namely push and pull forces between the item to be excited and the driver arm.
In an embodiment both a push rod and a second push rod are adapted to excite the item to be excited independently of each other, in order that a two-dimensional excitation pattern be provided. The two push rods usually shall attack the item at lines of attack, which are at right angle to each other. By timing the action of motion of the two rods, rather intricate movements in two-dimensional space may be achieved. The connection between push rods and the item to be excited may comprise an intermediate part which has surfaces adapted to be attached to the item under test such that the forces transmitted to the item may be distributed over a larger area. This shall ensure that items are not unduly stressed in a single point of attack. The invention also comprises a system for excitation of an item in two different directions, whereby the system has a push rod and a further push rod, each of which are connected to the item whereby each push rod is energized through a drive chain by a motor and gearing wherein each motor is adapted to supply synchronous rotational output on at least two output shafts. It is preferred that the drive chain between motor and its push rod comprises an elastically deformable cross member, which cross member is adapted to be deformed in order to impart a torque in a first direction and an equally sized torque in an opposed direction on respective ones of the two output shafts belonging to each motor and gearing. Hereby it is ensured, that intricate two- dimensional drive patterns may be imparted on an item under cyclic load test, and that no force peaks or backlash actions from adjacent gearwheels inside the gearing shall result from load or torque sign shifts
DK 2020 00008 A1 7 through the drive chain from motor to the item under test.
Description of the Drawings The invention will become more fully understood from the detailed description given herein below.
The accompanying drawings are given by way of illustration only, and thus, they are not limitative of the present invention.
In the accompanying drawings: Fig. 1 shows a schematic situation plan of the use of an excitation device 25 according to the invention; Fig. 2 shows a close-up view of the excitation device 25; Fig. 3 is a cross sectional view through a part of the excitation device 25; Fig. 4 shows an end view of two excitation devices; Fig. 5 is a close-up view of the part usable to impart distortion or deformation of a part of the drive chain; Fig. 6 is another close-up of the part shown in Fig. 5, however seen from a different angle of view, Fig. 7 illustrates the cinematics of two drive chains; Fig. 8 is an alternative drive chain; Fig. 9 shows a section along the length axis of the jack 42 and Fig. 10 disclose two force output curve/time measurements.
Detailed description of the invention Referring now in detail to the drawings for the purpose of illustrating preferred embodiments of the present invention, an excitation device with a drive chain between an element, which is to be excited in a test where real loads are mimicked, and a motor is illustrated in Fig. 1. As seen in Fig. 1 the item 30 to be excited may be a wind turbine blade, which at its root end 32 is fastened to an unmovable block and somewhere along the blade towards the tip end, a frame 34 is mounted
DK 2020 00008 A1 8 immovably to the blade exterior. This is also disclosed in Fig. 4. The excitation devices 25 may now forcedrive the blade through connections between the frame and two push rods 16, 26 which are part of the drive chain 24 between motors 10 and the frame 34. The excitation device 25 comprises a foundation and stable connection thereto, but such measures are well known in the art and therefore not elucidated in any further detail. The drive chain 24 (indicated with dashed line in Fig. 2 and further shown in Fig. 7 and 8) comprise the mechanical parts which connects the motor 2 to the item 30 to be driven. There is further detailed a loop, which comprise the parts of the drive chain 24, which interlinks the one motor output shaft 4.1 with the further output shaft
4.2. The loop, when referred to in connection with the disclosed embodiments shall thus comprise the shafts 4.1; 4.2, the gear arms
8.1, 8.2, possibly the further intermediate transmission elements 38 (shown in Fig. 8) and the cross member 6. Each pushrod 16, 26 is connected to the frame 34 at a rotational connection 20, and as seen in Figs. 5 and 6, the connections 20 are attached to the frame 34 through a common driver axel 22. As also seen in Fig. 4, the pushrod 16 and the further pushrod 26 attack the axel 22 with an angle between them of around 90 deg. By forcing the pushrods 16, 26 along their length direction towards the blade and away from it, the blade may be moved in dynamic intricate patterns, which are not unlike the patterns of movement which wind turbine blades may be subject to during real life operation. In an equilibrium and immobile state, the item 30 is not subject to any force from the push rods 16,26 and when moved a given distance away from the equilibrium state, usually an increasingly strong force or tension shall be transmitted through a push rod 16;26 and in case the next part of the cycle passes back through the equilibrium state and forces the blade in an opposed direction, this will lead to the force in the
DK 2020 00008 A1 9 push rod 16;26 shifting operational sign as well as an operational sign change in the torque passing through the gearing. Such a change of torque direction during a drive action of a gearing may cause generation of very high, but short force pulses at the teeth of the toothed wheels due to backlash between toothed wheels interacting with each other, and this causes increased wear on the gearing, increased noise levels, and also the force pulses may be transmitted to the blade, and here disturb the test and give rise to mis-representations of data gathered from measuring equipment mounted at the item 30 or the drive chain 24 in order to keep track of the test. It shall be mentioned that also vibrations caused by mass and spring interactions within the item under test may cause shift of operational sign of forces and torques through the drive chain. As in many cases the tests are fatigue tests and their duration is long, the continued exposure to force peeks in the system cause an increased wear. A schematic representation of a drive chain for producing the excitation movement of a pushrod 16 is presented in Fig. 7. And the reference numbers and naming of parts of the drive chain 24 used in the following shall refer both to the schematic representation in Fig. 7, and the representations in Figs 2, 3, 4, 5 and 6 of the examples of the invention shown here. A motor 2 is provided and has a first output shaft 4.1 and a further output shaft 4.2. Between the motor and the two output shafts 4.1, 42 there are usual gearings 10 with a predefined reduction of the rotation speed between input side and output side, and corresponding increase in torque as is well known in the art. It would also be possible to provide a motor with only one output shaft, and a gearing arranged which has one input, but two output shafts.
The gearing wheels themselves are not disclosed in the drawings, as they are not as such part of the invention. The play or backlash between such toothed wheels are common if not a requirement at such
DK 2020 00008 A1 10 gears and even if one of the root causes of the problem, they are not so much part of the solution which is presented. Reference sign 10 refers to the gearing box and its content of gearing wheels, even if the latter are not shown.
The motor 2 is an electric motor with a centrally placed shaft, and with electrical windings and magnets placed outside of the shaft as is well known in the art.
At the end of each output shaft 4.1, 4.2 and connected therewith, gear arms 8.1, 8.2 are provided. When driving the motors back and forth, the gear arms 8.1, 8.2 shall rotate in alternate directions respectively. At the end of each gear arm, a cross member 6 is arranged, which firmly connects the first gear arm 8.1 with the further gear arm 8.2.
This provides the loop between the two output shafts 4.1; 4.2. At a midpoint between the connections to the gear arms 8.1, 8.2 there is provided a driver arm 12. The driver arm 12 is arranged to function cinematically as a direct extension of the gear arms 8.1, 8.2. At the end of the driver arm 12, a rotational connection 20 is provided, such as an axle and bearing connection, and here the push rod 16 at a first end thereof 18.1 is connected to the driver arm 12. Due to the rotational connections at both ends 18.1, 18.2 of the push rod, only push or pull forces are transmitted through the push rods 16, 26.
As seen in Fig. 4, and Figs. 5,6 and 7, a distortion arm 40 and distortion jack 42 are provided at the second end of the cross member 6.2. When a torque or twist distortion is to be introduced onto the cross member 6, initially the connections between the cross member end 6.2 and further gear arm 8.2 as well as the connection between the driver arm 12 and the cross member 6 are released, such that the cross member 6 may rotate with respect to driver arm 12 and with respect to the further gear arm 8.2. The distortion arm 40, being connected un-rotationally to
DK 2020 00008 A1 11 the outer end of the second end of the cross member 6.2 is then forced to rotate by use of the jack 42 as the jack 42 is connected to the distortion arm. As seen in Fig. 9, the distortion jack 42 has a threaded footing 44, mounted into a radial threaded hole 46 in a ring 48 mounted on the output shaft 4.2. The ring 48 allows the angular shift of the jack 42 with respect to the axis running through the centres of the output shaft 4.2 and the centre of the cross member 6 to be accommodated by rotation of the ring 48 around the output axle 4.2. These changes will take place as the connection point of the jack 42 with the distortion arm 40 is moved towards or away from the output shaft centre. The jack may preferably be operated with a torque restricted wrench or the like tool, such that the distortion torque installed in the cross member 6 may be precisely measured and controlled.
When the jack 42 is activated, the distortion arm 40 is lowered or lifted with respect to the output axle 42, and thereby the second end of the cross member 6.2 is twisted with respect to the first end of the cross member 6.1. Simultaneously an angle between the outer end of the gear arm 8.2 and the distortion arm 40 is adjusted.
The required angle shall depend on the torsional resistance of the torsional member 6 and on the maximum load, which shall be transmitted through the push-rod 16. In order to avoid un-due wear on the gearings, the distortion, which is imparted on the cross member 6 shall be adjusted according to the loading, whenever a new fatigue test is to be performed.
Once a distortion torque has been imparted on the cross member 6, it may again be connected at its midpoint to the driver arm 12 and at its second end 6.2 to the further gear arm 8.2. Now the cross member 6 shall act as a torsional spring, which has been tightened. Followingly, the cross member 6, which provides the excitation engages the one of
DK 2020 00008 A1 12 the two output shafts 4.1;4.2 with a forced predefined torque in a first direction and engages the further output shaft 4.2 with the same size predefined torque in an opposed direction. In this connection, it shall be mentioned that the two gear arms 8.1, 8.2 are merrily extensions of the radius of the output shafts, and cinematically serves as parts of the output shafts 4.1, 4.2. As seen in Fig. 3 at the enlarged view, the connections between the gear arm 8.3 and cross member 6 are provided by conically shaped rings 50, which are pulled together by a range of bolts 51. Hereby a connection which is easy and fast to assemble and dis-assemble is provided, which is important as whenever the distortion of the cross member 6 must be adjusted, this connection must be released and retightened. The connection between the cross member 6 and driver arm 12 and the connection between cross member 6 and distortion arm are likewise made as releasable interacting conically shaped rings 50 which, when pulled together by bolts 51, interact to impart both radially inward as radially outward directed connection forces. This connection may also allow the cross member to engage the gear arm and driver arm at any angle between the cross member and gear arm and driver arm respectively. The driver 12 shall be connected to the cross member 6 at its midpoint and will thus be un-affected by the installed distortion in the cross member 6. As seen in Fig. 1, 2 and 4, two excitation devices 25 are provided, and even if not shown, both devices 25 may have their cross member 6 distorted or twisted in the above described way.
The principles of the invention are also shown in Fig. 8, however the gear arms 8.1, 8.2 are displayed as cogwheels, which may rotate full
DK 2020 00008 A1 13 revolutions with the output shafts 4.1, 4.2. The excitation motor 2 imparts synchronous rotational output on two shafts 4.1, 4.2. Intermediate gearing 10 is also provided at each side of the motor 2. The gearing may be provided at other points of the drive chain or embedded in the motor 2. Any number of further toothed wheels 38 may be provided in succession in a drive chain or loop from the motor output shaft 4.2 and back to the other motor output shaft 4.1. At the end of the drive loop, the cross member 6 is provided, which interconnects the two output axels 4.1, 4.2 and is needed in order to ensure a predefined torque in opposed directions at the output axels
4.1, 4.2. This cross member may here be loosened from its connection with a toothed wheel, and while fixated at an opposed end, twisted a predefined amount before being again fixated to its toothed wheel. With this provision, a forced predefined torque in a first direction shall continually be imparted on a first output shaft 4.1, and a same size torque in an opposite direction shall be continually imparted a further output shaft 4.2. In Fig. 8, the driver arm 12 is shaped somewhat differently, as it may here be part of an eccentric which, if shaped correctly may revolve full revolutions with the cross member 6.
In figs. 2,3, 4, 5, 6, 7 and 8 the members: gearing 10, gear arms 8.1,
8.2 and cross member 6 form part of the same drive loop, which interconnects the two outputs shafts 4.1 and 4.1 from the motor 2. The drive chain 24 comprises the drive loop and further mechanically interlinked parts which connects the loop with the part to be excited. The cross member 6 may be connected to the output shafts 4.1; 4.2 through intermediate parts 38, as seen in Fig. 8, or connected directly thereto via a gear arm 8.1, 8.2 which serves as an extension of the radial size of each of the output shafts 4.1, 4.2. In Fig. 7 and Fig. 8 only one drive chain 24 is disclosed, and when an
DK 2020 00008 A1 14 item 30 needs to be driven according to two, or to three dimensional patterns, drive chains 24 shall be needed for each further dimension. In Figs. 4, 2 and 1, two opposed drive chains 24 are provided, which may be driven independently of each other, and they may thereby drive an item such as the disclosed wind turbine blade 30 according to a predefined scheme. When the invention is embodied in a drive chain of this nature, even if the forces transmitted through the push rod are reversed during drive, the predefined distortion shall ensure, that the torque on cogwheels of the gearing 10 shall not shift direction.
In Fig. 10, two measurements of a reaction force with respect to time in a pushrod is disclosed. At the left hand side, a measurement with the use of a pre-installed distortion tension in the cross member 6 is shown, and at the right hand side, the same measurement is shown without the pre-installed distortion. It is clear, that in case the observer is interested in peak values of the measured forces, the left hand side of the measured forces provides the best opportunity for a precisely defined reading of peak values.
DK 2020 00008 A1 15 List of reference numerals 2 -Motor 4 -Output shafts
4.1 -First output shaft
4.2 -Further output shaft 6 -Cross member
6.1 -First end of cross member,
6.2 -Second end of cross member
8.1 -Gear arm
8.2 -Further gear arm 10 -Gearing 12 -Driver arm 14 -Un- rotational connection 16 -Push-rod
18.1 -First end of a push rod
18.2 -Second end of a push rod -Rotational connection 20 22 -Driver axle 24 -Drive chain -Excitation device 26 -Second push rod -Item 25 32 -Root end 34 -Frame 38 -Toothed wheels 40 -Distortion arm 42 -Distortion jack 30 44 -Threaded footing 46 -Threaded hole 48 -Ring
DK 2020 00008 A1 16 50 -Conically shaped rings 51 -Bolts

权利要求:
Claims (15)
[1] 1. A method for excitation in one or more directions, whereby a motor (2) supplies synchronous rotational output on two output shafts (4) in order to drive the excitation and wherein at least one gearing is inserted in the drive chain between the motor and the two output shafts, characterised in that a cross member (6) provides the excitation whereby the cross member (6) engages the one (4.1) of the two output shafts (4) with a forced predefined torque in a first direction and engages the further output shaft (4.2) with the same size predefined torque in an opposed direction.
[2] 2. A method according to claim 1, characterised in that the cross member (6) engages each of the output shafts (4) through gear arm (8.1) and further gear arm (8.2) respectively.
[3] 3. A method according to claim 2, characterised in that the predefined torque is loaded onto the cross member (6) by twisting or rotating the cross member (6) at a first end (6.1) thereof with respect to an opposed second end (6.2) thereof, and followingly fasten each end un- rotationally to each its gear arm (8.1; 8,2) in the twisted or rotated position.
[4] 4. A method according to claim 2, characterised in that two output shafts (4) rotate synchronously and coaxially and extend in each their direction away from a centrally placed motor (2) whereby the motor (2) transmits the rotation to each output shaft (4.1; 4.2) through each its gearing (10).
[5] 5. A method according to claim 4, characterised in that the cross member (6) is moved in a circular arch path transversely to a length direction thereof by the rotation of the two gear arms (8.2; 8.2), and that in extension of the gear arms (8.1; 8.2), a driver arm (12),
DK 2020 00008 A1 18 through an un-rotational connection (14) to the cross member (6), transmits excitation movement to a push rod (16) through a rotational connection between driver arm (12) and a first end (18.1) of a push rod (16).
[6] 6. A method according to claim 5, characterised in that the push rod (16) engages an item to be excited through a rotational connection (20) at a second end (18.2) of the push rod (16).
[7] 7. A method according to claim 6, characterised in that a second push rod (26) excites the item simultaneously with a line of attack which is off set from a line of attack of the first push rod (16) in order that a two-dimensional excitation pattern may be provided.
[8] 8. An excitation device (25) which has a motor (2) and gearing (10) with synchronous rotational output on two output shafts (4.1; 4.2) in order to force drive the excitation, characterised in that a cross member (6) is adapted to provide the excitation and that the cross member (6) is connected to the one of the two output shafts (4.1) with a forced predefined torque in a first direction and connected to the further of the two output shafts (4.2) with the same size predefined torque in an opposed direction.
[9] 9. An excitation device (25) acording to claim 8, characterised in that the cross member (6) is connected to each of the output shafts (4.1;
4.2) through each its gear arm (8.1; 8.2).
[10] 10. An excitation device (25) according to claim 9, characterised in that the cross member (6) is twisted a predefined angel around a length axis thereof at the one end with respect to an opposed end, and fastened un-rotationally to each its gear arm (8.1; 8.2) in each end (6.1; 6.2) in the twisted position.
DK 2020 00008 A1 19
[11] 11. An excitation device (25) according to claim 10, characterised in that the two output shafts (4.1; 4.2) are adapted to rotate synchronously and coaxially and extend in each their direction away from a centrally placed motor (2) whereby the motor (2) is adapted to transmit the rotation to each of the output shafts through each its gearing (10).
[12] 12. An excitation device (25) according to claim 10, characterised in that the cross member (6) is adapted to move in a circular arch path by the rotation of the two gear arms (8.1; 8.2), and that in extension of the gear arms (8.1; 8,2), a driver arm (12) is connected through and un-rotational link (14) to the cross member (6) in order to transmit excitation movement to a push rod (16;26), whereby the push rod (16,26) is connected to the driver arm (12) through a rotational connection (20) between driver arm (12) and a first end of the push rod (18.1).
[13] 13. An excitation device (25) according to claim 12, characterised in that the push rod (16;26) is in engagement with an item to be excited through a rotational connection (20) at a second end (18.2) thereof.
[14] 14. An excitation device (25) according to claim 13, characterised in that a both a push rod (16) and a second push rod (26) are adapted to excite the item to be excited independently of each other, in order that a two-dimensional excitation pattern be provided.
[15] 15. A system for excitation of an item in two different directions, and having a push rod (16) and a further push rod (26), each of which are connected to the item whereby each push rod is energized through a drive chain (24) by a motor (2) and gearing (10) wherein each motor (2) is adapted to supply synchronous rotational output on at least two
DK 2020 00008 A1 20 output shafts (4.1; 4.2) characterised in that the drive chain between motor (2) and its push rod (4.1; 4,2) comprises an elastically deformable cross member (6), which cross member (6) is adapted to be deformed in order to impart a torque in a first direction and an equally sized torque in an opposed direction on respective ones of the two output shafts (4.1; 4,2) belonging to each motor (2) and gearing (10).

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DK180602B1|2021-10-14|

引用文献:

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公开号 | 申请日 | 公开日 | 申请人 | 专利标题

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法律状态:
2021-08-05| PAT| Application published|Effective date: 20210707 |

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2021-10-14| PME| Patent granted|Effective date: 20211014 |

优先权:

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申请号 | 申请日 | 专利标题

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DKPA202000008A|DK180602B1|2020-01-06|2020-01-06|Method for excitation in one or more directions and an excitation device|DKPA202000008A| DK180602B1|2020-01-06|2020-01-06|Method for excitation in one or more directions and an excitation device|