• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Multi-panel metal and magnetorheological, which is constituted in a sandwich structure consisting of a core (2) consisting of a viscoelastic resin (2) of adhesive nature, in which they are evenly distributed isotropically or anisotropically with a proportion in volume greater than 5%; and magnetorheological particles of ferromagnetic material and with sizes comprised between 10nm and 10μm, said core (1) being disposed between a first skin (11) of non-magnetic metallic nature and a second skin (12) of a non-magnetic metallic nature equal to or different from the first skin. The ratio of the thickness (hn) of the core to any of the thicknesses (h1), (h2) of the skins first (11) and second (12) is less than 0.1 and greater than 0.01.
    公开号:ES2557390A1
    申请号:ES201431113
    申请日:2014-07-24
    公开日:2016-01-25
    发明作者:Leire IRAZU ECHEVERRIA；María Jesús Elejabarrieta Olabarri；Carlos Tapia De La Fuente；Yolanda GARCÉS INÚÑEZ；Jose Mari ERROBA ESQUIROZ；Beatriz FERNÁNDEZ RESANO；Beatriz LERGA FLAMARIQUE
    申请人:Recubrimientos Plasticos SA；
    IPC主号:
    专利说明:

    Object of the invention
    The object of the invention is a metal panel with magnetorheological sandwich structure (SEMR) capable of high acoustic and vibrational damping and with structural applications in many different sectors, such as elevators, automobiles, aviation, appliances, construction, etc., etc.
    The control of the structural vibrations of the mechanical systems is a fundamental aspect to guarantee its correct operation and its duration. Structural vibrations are a source of noise and failures associated with the mechanical fatigue to which the different components of the system are subjected. To control unwanted vibrations and / or noise, damping techniques are used consisting of configurations of mechanical elements or materials designed to dissipate mechanical energy.
    Magnetic materials are intelligent materials that have an MR effect under a magnetic field. The MR effect consists in modifying the rheological properties of the material instantaneously and reversibly by applying an external magnetic field. MR materials are composed of micrometric sized magnetic particles suspended in a non-magnetizable matrix. Since Rabinow in 1948 discovered MR materials, they have evolved and are now classified into MR fluids (FMR), MR gels and MR elastomers (EMR). The most common MR material is FMR, but these have certain drawbacks compared to EMR. The most obvious advantage of EMRs is that they have a stable MR effect since magnetic particles do not settle over time. In addition, they maintain their geometric shape even when applying low fields so they do not present sealing problems when making sandwich structures. Thus, EMRs are a good option for making sandwiches with magnetorheological core.
    Sandwich structures with magnetorheological core (SEMR) can control and dissipate vibrations over a wide range of excitation and temperature frequencies, varying the stiffness and damping of the structure in response to the intensity of the applied magnetic field. The applications of these adaptable sandwiches are multiple due to their advantages such as lightness, stiffness, resistance and especially for the ability to modify their dynamic properties according to the required needs.

    Background of the invention
    The magnetorheological elastomer (SEMR) sandwiches, already known, are made up of aluminum skins due to their low damping and high rigidity compared to EMRs. In addition, the relative magnetic permeability of aluminum is almost nil, so it does not affect the distribution and intensity of the magnetic field.
    The core of the SEMRs is mainly composed of a polymer matrix and magnetic particles. The matrix used by the different authors to manufacture the EMR are, the Selleys Pty.Limited silicone with the Poly dimethylsiloxane fluid, the Liyang Silicone Rubber, the inorganic polymer Bentonite Clay and synthetic oil and the Elastosil M4644 silicone. As magnetic particles the most used is carbonyl iron (C5FeO5), with a diameter greater than 3 µm and in a proportion of 25-30% by volume of the EMR.
    For the bonding of the polymer matrix to the skins, an adhesive is used.
    In the known SEMR sandwiches, the ratio of the thickness of the skin to the thickness of the core varies between 1.1% and 20%, that is, the core is always much thicker than the skins.
    This configuration involves several problems.
    Known SEMRs are very expensive products.
    They also present the problem of being excessively thick, which makes it difficult to apply precisely in structures that, due to their high added value, such as aviation or automotive, would be highly desirable to use.
    In structures that require a folding of the SEMR of more than 90º we have verified the tendency to detach, due to the excessive thickness of the sandwich.
    The need for the adhesive, to join the core with the skins, results in a more complex and consequently more expensive SEMR processing.
    These and other problems are solved by the SEMR object of the invention. Description of the invention
    The panel object of the invention overcomes these problems by being a sandwich structure characterized in that it consists of a core that, in turn, consists of a viscoelastic resin of an adhesive nature, in which they are uniformly distributed in an isotropic or


    anisotropic with a proportion in volume greater than 5%; magnetorheological particles of ferromagnetic material with sizes between 10nm and 10µ; said core being arranged between a first skin of a non-magnetic metallic nature and a second skin of a non-magnetic metallic nature equal to or different from the first skin.
    It is also characterized in that the ratio of the thickness of the core to any of the thicknesses of the first and second skins is less than 0.1 and greater than 0.01: 0.01 ≤ or ≤0.1.
    Other configurations and advantages of the invention can be deduced from the following description, and from the dependent claims. Description of the drawings
    In order to better understand the object of the invention, a preferred embodiment is shown in the attached figures, susceptible of accessory changes that do not distort its foundation. In this case:
    Figure 1 is a schematic representation of a known magnetorheological sandwich (SEMR).
    Figure 2 is a schematic representation of a practical embodiment of the magnetoreological sandwich (SEMR) object of the invention. Description of a preferred embodiment
    An example of practical, non-limiting embodiment of the present invention is described below. Other embodiments in which accessory changes are introduced that do not distort its foundation are not ruled out at all.
    Figure 1 shows the constitution of an SEMR consisting of a core (2 ’) of polymeric matrix in which magnetic particles of carbonyl iron larger than 3 µm in size and spherical are distributed.
    It also consists of two skins (1’1), (1’2) of the same metallic material, aluminum or non-magnetic steel, that is, both are made of aluminum or both are made of non-magnetic steel.
    To bond the core (2 ’) to the skins (11), (1’2) an adhesive (3) is used.
    The thickness of the core (H’4) is much greater than the thickness of the skins (H’1) (H’2), some
    (’) Or (’)
    Manufacturers make between 1.1% and 3%, others reach up to 20%.
    (’)


    Figure 2 shows that in the constitution of the SEMR, object of the invention, the adhesive (3) has disappeared. The core (2) is a viscoelastic resin, preferably pressure sensitive (PSA), for example, of a polyester, acrylic, polyurethane nature, etc., so that its inherent viscous properties serve for direct adhesion to the skins (11 ), (12).
    5 In the core (2) are magnetically distributed in an isotropic or anisotropic manner, magnetorheological particles of ferromagnetic material, preferably of iron pentacorbonyl (C5FeO5) but could be nickel, cobalt, etc.
    Magnetorheological (magnetizable) particles of different diameters (Ø) between 10nm and 10µ can be used, but preferably spherical particles of diameter (Ø) smaller than
    10 1.3µm: Ø  1.3µm, which is less than half the diameter of the particles currently used in known sandwiches.
    The concentration of magnetorheological particles with respect to the whole core (2) can vary from 5% to 25%, but preferably, due to the results obtained in the laboratory, the concentration is between 10% and 20%, the magnetorheological effect being excessively weak.
    15 below 5%.
    The skins (11), (12) can be of the same or different metal, but always the metal / s must be non-magnetic, for example, copper, zinc, aluminum, non-magnetic steel, such as non-ferritic stainless steel or , especially, austenitic stainless steel.
    We have verified in the laboratory that good results are obtained using a skin of
    20 aluminum and another of steel, possibly because having said metals different modulus of elasticity cause a greater vibration damping when the MR core works between two asymmetric skins.
    It is essential in the object of the invention the ratio of thicknesses of the skins (H1), (H2) with respect to the thickness of the core (Hn) since that is what allows its application in the structures of
    25 planes or cars.
    Working with skins (11), (12) of thicknesses (H1), (H2) similar to the thicknesses (H'1), (H'2) used in the art known in the invention, core thicknesses (Hn ) much lower than the core thicknesses (H'n) known
    0.05 ≤ ´≤0.5


    and, in general, the thickness ratio of the skins (H1), (H2) and the core (Hn) is determined by 0.01 ≤ or ≤ 0.1
    Examples:
    Skin 1 NucleusSkin 2
    Material Thickness [mm] Material MaterialThickness [mm]
    AISI 316 0.25AN601 AISI 3160.25
    AISI 316 0.25AN601 + 12% Fe AISI 3160.25
    AISI 316 0.25AN601To the0.5
    AISI 316 0.25AN601 + 12% FeTo the0.5
    To the 0.5AN601 To the0.5
    To the 0.5AN601 + 12% Fe To the0.5
    The core thicknesses vary between 0.02 mm and 0.01 mm, with a skin thickness of 0.25 mm; 5 and between 0.04 mm and 0.01 mm, with a skin thickness of 0.5 mm.
    The fur-core joint is carried out by means of the continuous coil coating process, the adhesive being applied by rollers.
    The HPB Half-Power Bandwith method is applied to obtain the loss factor in each mode. This method consists in that at each resonance frequency fn it is calculated at which frequencies 10 the transmissibility module 3.01db drops and Δfn is determined. The loss factor is obtained with the experimental data obtained from fn and Δfn in each way.
    η = ∆
    Being:
    fn: resonant frequency of mode n (Hz)
    15 Δfn: HPB mode n (Hz)


    The particles are of iron pentacarbonylo (C5FeO5) of different sizes, between 10 nm and 10 µ
    The core is Koratac AN 601 resin
    AISI 316 is austenitic stainless steel.
    5 Al is aluminum.
    In the analysis of the first frequency for an applied frequency between 10 and 50 Hz it is appreciated that the sandwich loss factor can be increased by 30% by applying magnetic field with respect to the same sandwich with non-MR core.
    From the results it should be noted that the magnetic field modifies the stiffness and
    10 damping of all analyzed sandwiches. The structure loses stiffness at low frequencies and generally increases the damping especially in the sandwich with aluminum and steel skins.
    The materials, dimensions, proportions and, in general, those other accessory or secondary details that do not alter, change or modify the essentiality may be variable.
    15 proposal.
    The terms in which this report is written are true and faithful reflection of the object described, and should be taken in its broadest sense and never in a limiting way.

    权利要求:
    Claims (5)
    [1]
    1.-Multi-panel metal and magnetorheological, characterized in that it constitutes a sandwich structure consisting of
    a) a core (2) consisting of
    5 a1) a viscoelastic resin (2) of an adhesive nature, in which they are uniformly distributed in an isotropic or anisotropic manner with a volume ratio greater than 5%
    a2) magnetorheological particles of ferromagnetic material and with sizes between 10nm and 10µ, said core (1) being arranged between
    10 b) a first skin (11) of a non-magnetic metallic nature and a second skin (12) of a non-magnetic metallic nature equal to or different from the first skin;
    and because
    c) the ratio of the thickness (Hn) of the core to any of the thicknesses (H1), (H2) of the first (11) and second (12) skins is less than 0.1 and greater than 0.01
    15 0.01 ≤ ≤0.1
    or
    [2]
    2. Multi-panel metal and magnetorheological, according to claim 1, characterized in that the first and second skin (11), (12) are made of aluminum.
    [3]
    3. Multi-panel metal and magnetorheological, according to claim 1, characterized in that the first and second skin (11), (12) are made of non-ferritic stainless steel.
    20 4. Multi-panel metal and magnetorheological, according to claim 1, characterized in that the first skin (11) is aluminum and the second skin (12) is non-ferritic stainless steel.
    [5]
    5. Multi-panel metal and magnetorheological according to one of claims 2, 3 or 4, characterized in that the thickness (H1) of the first skin (11) is equal to the thickness (H2) of the second skin (12) .
    6. Multi-panel metal and magnetorheological, according to claims 2, 3 or 4, characterized in that the thickness (H1) of the first skin (11) is different from the thickness (H2) of the second skin (12).

    [7]
    7. Multi-panel metal and magnetorheological, according to claim 1, characterized in that the viscoelastic resin (2) is based on polyester and / or acrylic and / or polyurethane.
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    同族专利:
    公开号 | 公开日
    ES2557390B1|2016-11-07|
    PL2977201T3|2019-09-30|
    PT2977201T|2019-06-04|
    TR201907276T4|2019-06-21|
    US9539791B2|2017-01-10|
    US20160023440A1|2016-01-28|
    ES2726148T3|2019-10-02|
    EP2977201A1|2016-01-27|
    DK2977201T3|2019-05-27|
    EP2977201B1|2019-02-20|
    引用文献:
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    WO2001061713A1|2000-02-18|2001-08-23|The Board Of Regents Of The University And Community College System Of Nevada|Magnetorheological polymer gels|
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    WO2017213478A1|2016-06-10|2017-12-14|엘지하우시스|Sandwich panel and method for manufacturing same|
    WO2017213480A1|2016-06-10|2017-12-14|엘지하우시스|Sandwich panel and method for producing same|
    KR102294370B1|2016-06-10|2021-08-26|엘엑스하우시스|A molded object and a manufacturing method thereof|
    CN106292008A|2016-09-09|2017-01-04|京东方科技集团股份有限公司|Welding fixture and the method utilizing welding fixture to carry out welding|
    CN112065016B|2020-09-02|2022-01-25|国网福建省电力有限公司|Overhaul platform based on magnetorheological fluid|
    法律状态:
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    优先权:
    申请号 | 申请日 | 专利标题
    ES201431113A|ES2557390B1|2014-07-24|2014-07-24|Multi-panel metal and magnetorheological|ES201431113A| ES2557390B1|2014-07-24|2014-07-24|Multi-panel metal and magnetorheological|
    US14/746,211| US9539791B2|2014-07-24|2015-06-22|Metal and magnetorheological multi-panel|
    PT15382345T| PT2977201T|2014-07-24|2015-06-29|Magnetorheological metal multi-panel|
    TR2019/07276T| TR201907276T4|2014-07-24|2015-06-29|MAGNETOREOLOGICAL METAL MULTIPANEL|
    DK15382345.5T| DK2977201T3|2014-07-24|2015-06-29|METAL AND MAGNETIC-REOLOGICAL MULTI PANEL|
    ES15382345T| ES2726148T3|2014-07-24|2015-06-29|Multi-panel metal and magnetorheological|
    EP15382345.5A| EP2977201B1|2014-07-24|2015-06-29|Magnetorheological metal multi-panel|
    PL15382345T| PL2977201T3|2014-07-24|2015-06-29|Magnetorheological metal multi-panel|
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