Local resonance type photonic crystal primitive cell

Abstract

The utility model provides a local resonance type phononic crystal primitive cell which comprises a silicon rubber base body serving as an outer ring, a steel scatterer is arranged in an inner cavity of the silicon rubber base body, and the steel scatterer and the silicon rubber base body are connected and fixed through a soft material wrapping layer. The four spring mass subsystems are nested in the steel scattering body; a soft material wrapping layer is arranged on the side wall of the inner cavity of the silicone rubber base body. According to the utility model, a plurality of complete and directional band gaps in a low-frequency range can be effectively formed, and low-frequency elastic waves are effectively inhibited; the hollow and height difference design is adopted among the external silicon rubber base body, the steel scatterer and the spring mass subsystem, so that the vibration damping material has a sufficient deformation space to play a vibration damping role; the steel scatterer, the spring mass subsystem and other structures ensure that the anti-vibration pad has an enough supporting effect, band gap regulation and control of the local resonance type photonic crystal can be effectively achieved through material selection flexibility, and low-frequency vibration control of different frequency bands is achieved.

Description

Technical Field

[0001] The utility model provides a local resonance type phononic crystal unit cell, belonging to the technical field of shock absorbers. Background Technique

[0002] The vibration reduction problem of urban rail transit in China is a key problem that needs to be solved urgently at present. The environmental vibration problem caused by urban rail transit during operation will cause damage to the upper ancient building groups, affect the accuracy of precision instruments in scientific research institutes and other units, and the office environment in vibration-sensitive areas such as hospitals and libraries. In the long term, it will also seriously affect the living environment of the surrounding residents and cause a series of problems such as ground settlement. At present, the vibration reduction measures developed for urban rail transit can play a good role in reducing high-frequency vibration, but the control effect on low-frequency vibration is very limited. Compared with the influence of high-frequency vibration, low-frequency vibration has a more serious impact on the above problems and is more difficult to control. Content of the Utility Model

[0003] In view of the above technical problems, the utility model provides a local resonance type phononic crystal unit cell, which includes a silicone rubber matrix as the outer ring. A steel scatterer is arranged in the inner cavity of the silicone rubber matrix, and the steel scatterer and the silicone rubber matrix are connected and fixed by a soft material wrapping layer; four spring-mass subsystems are nested in the steel scatterer; a soft material wrapping layer is arranged on the inner cavity side wall of the silicone rubber matrix.

[0004] The spring-mass subsystem includes a steel spring and a rubber matrix. The helical steel spring is embedded in the straight cylindrical rubber matrix, and the height of the steel spring is lower than that of the rubber matrix.

[0005] The silicone rubber matrix and the spring-mass subsystem are of the same height, and the height of the steel scatterer is lower than that of the silicone rubber matrix and the spring-mass subsystem.

[0006] Compared with the prior art, the utility model has the following technical effects:

[0007] 1. The local resonance type phononic crystal has a significant effect in low-frequency control. The phononic crystal unit cell proposed by the utility model is composed of a silicone rubber matrix, a steel scatterer, a soft material wrapping layer and a spring-mass subsystem, belonging to a design scheme of a local resonance type phononic crystal structure. This design scheme can effectively form multiple complete and directional band gaps in the low-frequency range, and fully exerts the advantage of the local resonance type phononic crystal in effectively suppressing low-frequency elastic waves.

[0008] 2. The outer silicone rubber matrix and the steel scatterer of the utility model adopt a hollow structure, so that materials such as silicone rubber have sufficient deformation space to play their vibration reduction role; the soft material wrapping layer connecting the two also forms a spring-damping system when subjected to external forces, and can also play a certain vibration reduction role.

[0009] 3. The spring-mass subsystem combines the dual advantages of steel springs and rubber, has the advantages of stable performance and strong energy-bearing capacity. Embedding it into the steel scatterer is conducive to improving the elasticity and supporting effect of the overall structure, and working together with the external silicone rubber to achieve a dual vibration reduction effect; and the two belong to different vibration reduction materials, with a better vibration reduction range.

[0010] 4. In addition to constituting the local resonance type phononic crystal structure design, the steel scatterer can also ensure that the damping layer has sufficient stiffness in the case of damage to easily aging materials such as silicone rubber, and continue to play its good supporting role.

[0011] 5. Since the steel scatterer can ensure sufficient support, for the proposed local resonance type phononic crystal unit cell design, on the basis of ensuring the effectiveness of the selected vibration reduction materials, the manufacturing materials of the outer ring matrix, wrapping layer, spring-mass subsystem and other structures of the unit cell can be flexibly selected according to different vibration reduction purposes. On the basis of exerting the overall low-frequency band gap formed by local resonance, the band gap regulation of the local resonance type phononic crystal (that is, realizing the control of the low-frequency band gap offset) can be effectively achieved by changing the material parameters, and the low-frequency vibration in different frequency bands can be effectively controlled.

[0012] 6. When arranging two or more unit cells horizontally and vertically, in addition to exerting the functions of various spring-damping systems inside the unit cell, a spring-damping system is also formed between the unit cells. Therefore, on the basis of the design of various spring-damping systems, not only the local resonance characteristics are exerted, but also the periodic characteristics are further formed, which can play a better vibration reduction role. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a schematic structural diagram of the present utility model;

[0014] Figure 2 is a schematic cross-sectional structural diagram of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0015] The specific technical solutions of the present utility model will be described in conjunction with the accompanying drawings.

[0016] As Figure 1 and Figure 2 shown, the local resonance type phononic crystal unit cell mainly consists of an outer silicone rubber matrix 1, a steel scatterer 3 is arranged in the inner cavity of the silicone rubber matrix 1, and the steel scatterer 3 and the silicone rubber matrix 1 are connected and fixed by a soft material wrapping layer 2; four spring-mass subsystems 4 are nested in the steel scatterer 3; a soft material wrapping layer 2 is arranged on the inner cavity side wall of the silicone rubber matrix 1.

[0017] The described spring mass subsystem 4 includes a steel spring and a rubber matrix. The helical steel spring is embedded in the straight cylindrical rubber matrix, and the height of the steel spring is lower than that of the rubber matrix.

[0018] The silicone rubber matrix 1 and the spring mass subsystem 4 are of the same height, and the height of the steel scatterer 3 is lower than that of the silicone rubber matrix 1 and the spring mass subsystem 4.

[0019] The present utility model considers the stiffness requirements of the track structure vibration damping pad. The material of the local resonance type phononic crystal primitive cell structure is composed of silicone rubber, alloy steel and epoxy resin. Among them, the steel scatterer 3 and the silicone rubber matrix 1 are connected and fixed by a soft material wrapping layer 2, and the four spring mass subsystems 4 in the middle are nested inside the steel scatterer 3.

[0020] A middle hollow design is adopted between the outer silicone rubber matrix 1 and the inner steel scatterer 3 of the local resonance type phononic crystal primitive cell. In order to make the initial primitive cell structure have better vibration damping effect, a new local resonance type phononic crystal unit cell structure can be obtained by adding a spring mass subsystem 4 into the initial primitive cell structure. To ensure the vibration damping deformation space of the outer silicone rubber matrix 1; the steel scatterer 3 adopts an opening design, and four spring mass subsystems 4 are embedded inside.

[0021] A height difference design is adopted between the inner steel scatterer 3 and the outer silicone rubber matrix 1 and the spring mass subsystem 4. Among them, the silicone rubber matrix 1 and the spring mass subsystem 4 play a major role in vibration damping. Since the overall structure of the phononic crystal adopts a hollow design, the overall stiffness of the local resonance phononic crystal primitive cell structure will be reduced to some extent. In order to increase the overall stiffness and low-frequency bandgap width of the new local resonance phononic crystal primitive cell structure, the spring mass subsystem 4 composed of a steel spring structure and rubber is embedded into the open steel scatterer 3 to form a new composite scatterer structure. The inner steel scatterer 3 and other structures together ensure that the vibration damping pad has sufficient supporting effect.

Claims

1. The primitive cell of the locally resonant phononic crystal is characterized in that It includes a silicone rubber matrix (1) as the outer ring. A steel scatterer (3) is arranged in the inner cavity of the silicone rubber matrix (1). The steel scatterer (3) is connected and fixed to the silicone rubber matrix (1) by a soft material wrapping layer (2); four spring-mass subsystems (4) are nested in the steel scatterer (3); and a soft material wrapping layer (2) is arranged on the inner cavity side wall of the silicone rubber matrix (1).

2. The primitive cell of the locally resonant phononic crystal according to claim 1, wherein The spring-mass subsystem (4) includes a steel spring and a rubber matrix. The helical steel spring is embedded in the straight cylindrical rubber matrix, and the height of the steel spring is lower than that of the rubber matrix.

3. The primitive cell of the local resonance type phononic crystal according to claim 1, characterized in that, The silicone rubber matrix (1) and the spring-mass subsystem (4) are of the same height, and the height of the steel scatterer (3) is lower than that of the silicone rubber matrix (1) and the spring-mass subsystem (4).

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