CN210637424U - Rigidity-adjustable periodic structure with magnetic rheological body - Google Patents
Rigidity-adjustable periodic structure with magnetic rheological body Download PDFInfo
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- CN210637424U CN210637424U CN201920847912.0U CN201920847912U CN210637424U CN 210637424 U CN210637424 U CN 210637424U CN 201920847912 U CN201920847912 U CN 201920847912U CN 210637424 U CN210637424 U CN 210637424U
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Abstract
The utility model relates to a rigidity adjustable periodic structure with magnetic rheological body, including film or the board base member that has periodic or quasi-periodic shrinkage pool, pack the non-magnetic block and the magnetic rheological body in the shrinkage pool, when only adopting two binary forms, only pack the magnetic rheological body and be used for encapsulating the resin layer of shrinkage pool. The recesses can be arranged on one or both sides of the film or plate substrate. The film or the plate is used as a substrate, and when a three-component form is adopted, the non-magnetic block and the magneto-rheological body jointly form a scatterer vibrator; the physical property of the magneto-rheological body is changed in real time by controlling the intensity of the applied magnetic field, so that the band gap range of the periodic structure is changed, and the magneto-rheological body has the advantage of real-time active control. Compared with the traditional vibration isolation, the periodic structure can realize the integrated design of the structure and the vibration isolation system, has the advantages of light weight, wide vibration isolation frequency, real-time active control and the like, and has wide application prospect in the field of engineering vibration isolation.
Description
Technical Field
The utility model relates to a periodic structure especially relates to a rigidity adjustable periodic structure with magnetic rheological body.
Background
The periodic structure is a phononic crystal with limited space, the concept of the phononic crystal is deduced from the concept of the photonic crystal, and both the phononic crystal and the photonic crystal simulate the arrangement mode of natural crystal atoms and have a certain periodic structure. A composite material or structure in which two or more media with different elastic properties are spatially and periodically nested and an elastic band gap exists is called a phononic crystal. The existence of an elastic wave band gap is one of the most important characteristics of a phononic crystal, and there are two main physical mechanisms for generating the elastic wave band gap: bragg scattering mechanisms and local resonance mechanisms. Both band gaps are formed as a result of the structural periodicity and the Mie scattering of the single scatterer, differing only in whether the interaction (periodicity) of the individual repeating units dominates or the resonance of the single scatterer dominates. The band gap characteristic of the periodic structure can realize vibration reduction and noise reduction.
The magnetic rheological body is used as an intelligent material and mainly comprises magnetic particles, carrier liquid and additives, and shows fluid characteristics in the absence of an external magnetic field; after a magnetic field is applied, the magnetorheological body begins to solidify, and the magnetic particles are arranged into a chain, column or more complex net-shaped structure; when the applied magnetic field is removed, the magnetorheological fluid regains fluid behavior. The rapid and reversible transformation of the magnetic rheological body enables the magnetic rheological body to be widely applied in many fields. The study on the performance of magnetorheological materials mainly focuses on the shear properties perpendicular to the magnetic field, such as viscosity, shear yield stress, shear modulus, and the like.
The physical property of the magneto-rheological body is changed in real time by controlling the intensity of the applied magnetic field, so that the band gap range of the periodic structure is changed. The method has the advantage of real-time active control. Compared with the traditional vibration isolation, the periodic structure can realize the integrated design of the structure and the vibration isolation system, has the advantages of light weight, wide vibration isolation frequency, real-time active control and the like, and has wide application prospect in the field of engineering vibration isolation.
Disclosure of Invention
The technical problem is as follows: the utility model aims at providing a rigidity adjustable periodic structure with magnetic rheological body. The film or plate substrate is provided with periodic concave holes, and the magnetorheological body and the nonmagnetic block body are filled in the periodic concave holes, so that the physical parameters of the magnetorheological body are changed by changing the strength of an external magnetic field, and the real-time active control on the band gap range is realized. Can be applied to the field of vibration reduction and isolation.
The technical scheme is as follows: the utility model relates to a rigidity adjustable periodic structure with magnetic rheological body, this periodic structure fill the magnetic rheological body in the shrinkage pool including film or the board base member that has periodic or quasi-periodic shrinkage pool to and be used for encapsulating the resin layer of shrinkage pool, the form that distributes is two component or three component forms.
Wherein:
and a non-magnetic block is filled below the magnetic rheological body filled in the concave hole.
The concave holes filled with the non-magnetic blocks or the magnetic rheological bodies are arranged on one side or two sides of the thin film or plate substrate.
In the periodic structure, the smallest repeating unit forming the periodic structure is called a unit cell, and the arrangement shape among the unit cells can be a square, a triangle or other polygons.
When the two-component form is adopted, the magnetic rheological body fills the concave hole, and the cross section of the magnetic rheological body is circular, oval, rectangular or other polygonal shapes.
When the three-component mode is adopted, the side, far away from the base body, of the concave hole is filled with the non-magnetic block, the residual part in the concave hole is filled with the magnetic rheological body, and the cross section of the magnetic rheological body is also circular, oval, rectangular or other polygons.
The thin film or plate substrate and the concave hole are made of rubber or epoxy resin, and the non-magnetic block is made of a non-metal material or a non-magnetic metal.
The non-metal material is ceramic or plastic; the non-magnetic metal is lead, copper, aluminum, austenitic stainless steel and alloys thereof.
Has the advantages that: compared with the prior art, the utility model has the advantages of it is following:
1) the band gap characteristic of the periodic structure means that elastic waves or sound waves in certain frequencies are remarkably inhibited when the elastic waves or the sound waves propagate in a film or a plate, so that the periodic structure can prevent the elastic waves or the sound waves from propagating in a specific frequency range, and the purposes of vibration reduction and noise reduction are achieved.
2) The traditional vibration reduction and noise reduction device has large size and high manufacturing cost, and the periodic structure has the advantages of designable frequency, strong pertinence, small size, good effect and the like. Meanwhile, the manufacturing is convenient, and the standardized production is convenient.
3) Most of the periodic structure vibration damping devices are passively controlled, namely once the structure is determined, the attenuation frequency range of the periodic structure vibration damping devices is determined, and the band gap range is difficult to expand or change. The periodic structure with the magneto-rheological body can realize active control over the band gap range in real time.
Drawings
FIG. 1 is a cylindrical periodic structure diagram of the scatterer vibrator arranged on one side of the concave hole of the utility model;
fig. 2 is a cylindrical periodic structure diagram of the scatterer vibrators arranged on both sides of the concave hole of the utility model;
fig. 3 is a periodic structure diagram of the scatterer vibrator arranged on one side of the concave hole of the utility model in a cuboid shape;
FIG. 4 is a top view of the periodic structure of the present invention arranged in regular triangles between unit cells;
FIG. 5 is a diagram of a unit cell structure of the periodic structure of the present invention;
FIG. 6 is a cross-sectional view of a unit cell of a three-component periodic structure according to the present invention;
FIG. 7 is a cross-sectional view of a unit cell of a two-component periodic structure according to the present invention
The figure shows that: the magnetic flow type magnetic material comprises a film or plate substrate 1, a concave hole 2, a non-magnetic block 3, a magnetic flow body 4 and a resin layer 5.
Detailed Description
The utility model relates to a rigidity adjustable periodic structure with magnetic rheological body, this periodic structure fill nonmagnetic block and magnetic rheological body in the shrinkage pool including film or the board base member that has periodic or quasi-periodic shrinkage pool to and be used for encapsulating the resin layer of shrinkage pool, the form that distributes is two units or three units.
The periodic structure comprises a film or plate substrate with periodic or quasi-periodic concave holes, a magnetorheological body filled in the concave holes and a resin layer used for encapsulating the concave holes, wherein the distribution form is two components.
The recesses filled with non-magnetic blocks or magneto-rheological bodies may be arranged on one or both sides on the film or plate substrate.
The smallest repeating unit constituting the periodic structure is called unit cell, and the arrangement shape among the unit cells can be square, triangle or other polygons.
Further, when the two-component form is adopted, the magnetic rheological body fills the concave hole, and the cross section shape can be circular, oval, rectangular or other polygonal shapes. When the three-component mode is adopted, the side, far away from the base body, in the concave hole is filled with the non-magnetic block, and the cross section of the non-magnetic block can also be round, oval, rectangular or other polygons. The residual part in the concave hole is filled with the magnetic rheological body.
The material of the film or plate substrate and the concave hole can be rubber or epoxy resin, and the material of the block body can be non-metal materials such as ceramics and plastics, or non-magnetic metals such as lead, copper, aluminum and austenitic stainless steel and alloys thereof.
The forming method of the utility model is as follows:
the concave holes in m rows and n columns are arranged on the film or plate substrate on one side or both sides according to periodic or quasi-periodic arrangement; when the two-component form is adopted, the concave hole is filled with the magnetic rheological body, and when the three-component form is adopted, the concave hole is filled with the non-magnetic block and the magnetic rheological body. This forms a periodic structure having band gap characteristics. The repeating unit with the smallest periodic structure is called unit cell, and the arrangement mode between the unit cells can be square, triangle or other regular polygon. The material of the film or the plate substrate can be rubber or epoxy resin, and the material of the block can be non-metal materials such as ceramics and plastics, or non-magnetic metals such as lead, copper, aluminum and austenitic stainless steel and alloys thereof.
The band gap characteristic of the periodic structure means that elastic waves or sound waves in certain frequencies are remarkably suppressed when propagating in a film or a plate, and the periodic structure can be applied to vibration reduction and noise reduction by applying the characteristic. The magnetic rheological body mainly comprises magnetic particles, carrier liquid and additives, and shows fluid characteristics in the absence of an external magnetic field; after a magnetic field is applied, the magnetorheological body begins to solidify, and the magnetic particles are arranged into a chain, column or more complex net-shaped structure; when the applied magnetic field is removed, the magnetorheological fluid regains fluid behavior. The physical property of the magnetic fluid can be changed in real time by controlling the intensity of the applied magnetic field, so that the band gap range of the periodic structure is changed. The method has the advantage of real-time active control.
The invention will be described in further detail by way of example with reference to the accompanying drawings:
example 1:
as shown in fig. 1, 5, 6 and 7, the present embodiment is a stiffness-adjustable periodic structure with magneto-rheological bodies arranged on one side. The unit cells are arranged in a square mode, and the lattice constant is set to be a1The thickness of the film or board substrate is h, m rows and n rows of concave holes are formed in the film or board substrate, and the concave holes are cylindrical. FIG. 6 is a three component form, in which a non-magnetic block is placed on the bottom layerThe layer is filled with the magnetic rheological body. Fig. 7 is a two-component form, the recess is filled with magneto-rheological fluid.
Example 2:
as shown in fig. 2, 5, 6 and 7, the present embodiment is a stiffness-adjustable periodic structure with magneto-rheological bodies arranged on both sides. The unit cells are arranged in a square mode, and the lattice constant is set to be a1The thickness of the film or board substrate is h, m rows and n rows of concave holes are formed in the film or board substrate, and the concave holes are cylindrical. Fig. 6 is a three-component form, wherein a non-magnetic block is placed on the bottom layer, and the upper layer is filled with magnetic rheological bodies. Fig. 7 is a two-component form, the recess is filled with magneto-rheological fluid.
Example 3:
as shown in fig. 3, the present embodiment is a periodic structure with rectangular cross-sectional shape of the stiffness-adjustable vibrator with the magneto-rheological body, which is arranged on one side. The unit cells are arranged in a square mode, and the lattice constant is set to be a1The thickness of the film or board substrate is h, m rows of n rows of concave holes are formed in the film or board substrate, and the cross section of each concave hole is rectangular. The three-component type magnetic flow sensor can adopt a three-component type, wherein a non-magnetic block body is placed on the bottom layer, and the upper layer is filled with magnetic rheological bodies. It can also adopt two-component form, and the recessed hole is filled with magnetic rheological body.
Example 4:
as shown in fig. 4, 5, 6 and 7, the present embodiment is a stiffness-adjustable periodic structure with magneto-rheological bodies arranged on one side. The unit cells are arranged in a regular triangle, and the lattice constant is set as a1The thickness of the film or board substrate is h, m rows and n rows of concave holes are formed in the film or board substrate, and the concave holes are cylindrical. Fig. 6 is a three-component form, wherein a non-magnetic block is placed on the bottom layer, and the upper layer is filled with magnetic rheological bodies. Fig. 7 is a two-component form, the recess is filled with magneto-rheological fluid.
The above description is only a preferred embodiment of the present invention, and it should be noted that: for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be considered as the protection scope of the present invention.
Claims (7)
1. A rigidity-adjustable periodic structure with magnetorheologic bodies is characterized in that the periodic structure comprises a film or board substrate (1) with periodic or quasi-periodic concave holes (2), the magnetorheologic bodies (4) filled in the concave holes (2) and a resin layer (5) for encapsulating the concave holes (2), and the periodic structure is distributed in a two-component or three-component form.
2. The periodic structure with the adjustable rigidity and the magnetic rheological body as claimed in claim 1, characterized in that the nonmagnetic block (3) is filled below the magnetic rheological body (4) filled in the concave hole (2).
3. A stiffness tunable periodic structure with magneto-rheological bodies according to claim 2, characterized in that the recesses (2) filled with non-magnetic blocks (3) or magneto-rheological bodies (4) are arranged on one or both sides on a thin film or plate substrate (1).
4. The periodic structure with adjustable rigidity and magnetic rheological body of claim 1, wherein the periodic structure, the smallest repeating unit composing the periodic structure is called unit cell, and the arrangement shape among the unit cells can be square, triangle or other polygons.
5. A periodic structure with adjustable rigidity and a magnetorheostat according to claim 1, characterized in that when a binary form is used, the magnetorheostat (4) fills the recess (2) and the cross-sectional shape is circular, elliptical, rectangular or other polygonal shape.
6. Periodic structure with adjustable rigidity and magnetic rheological body according to claim 1, characterized in that when three-component form is adopted, the side of the concave hole (2) far away from the film or plate substrate (1) is filled with non-magnetic blocks (3), the residual part of the concave hole (2) is filled with magnetic rheological body (4), and the cross section is also circular, oval, rectangular or other polygonal shape.
7. The periodic structure with adjustable rigidity and magnetic rheological body according to claim 1, characterized in that the material of the film or plate substrate (1) and the recessed hole (2) is rubber or epoxy resin, and the material of the non-magnetic block (3) is non-metal material or non-magnetic metal.
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| CN201920847912.0U CN210637424U (en) | 2019-06-06 | 2019-06-06 | Rigidity-adjustable periodic structure with magnetic rheological body |
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| CN201920847912.0U CN210637424U (en) | 2019-06-06 | 2019-06-06 | Rigidity-adjustable periodic structure with magnetic rheological body |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110388402A (en) * | 2019-06-06 | 2019-10-29 | 东南大学 | A kind of adjustable periodic structure of rigidity with magnetic rheological body |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110388402A (en) * | 2019-06-06 | 2019-10-29 | 东南大学 | A kind of adjustable periodic structure of rigidity with magnetic rheological body |
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