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Multi-cascade phononic crystal vibration isolator

A phononic crystal and vibration isolator technology, which is applied in the field of rail transit, can solve the problems of small damping of spring bearings, short service life of rubber bearings, low-frequency vibration amplification, etc., to achieve convenient replacement, improve vibration isolation effect, and optimize design structure effect

Pending Publication Date: 2021-04-30
TONGJI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional floating plates are widely used, but the disadvantages of short service life of rubber bearings, small damping of spring bearings and low-frequency vibration amplification gradually appear

Method used

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  • Multi-cascade phononic crystal vibration isolator
  • Multi-cascade phononic crystal vibration isolator
  • Multi-cascade phononic crystal vibration isolator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Such as figure 1 As shown, this embodiment is a multi-cascaded phononic crystal isolator, the multi-cascaded phononic crystal isolator is a cylindrical structure, including a vibration isolator outer cylinder, a multi-cascaded phononic crystal The main structure of the vibration isolator and the structure of the inner cylinder of the vibration isolator. The inner cylinder structure of the vibration isolator includes a bearing top plate 4 and an inner cylinder 9; the main structure of the multi-cascade phononic crystal vibration isolator includes a main mass element 5, a secondary mass element 6, a central stiffness element 7, and a circumferential elastic element 8.

[0036] The main structure of the multi-cascaded phononic crystal vibration isolator ( figure 2 ) is placed in the inner cylinder 9, composed of several phononic crystal cells ( image 3 ), each cell is composed of a mass element and an elastic element; the mass element is a cylindrical or hollow cylind...

Embodiment 2

[0045] This embodiment is a multi-cascaded phononic crystal vibration isolator with a phononic crystal substructure, and its basic structure is consistent with that described in Embodiment 1. In particular, this embodiment redesigns the structure of the main mass element in Embodiment 1, such as Figure 7 As shown, a phononic crystal substructure with 3 periods is provided on the solid part of the main mass element 5, and 2 to 4 periods can also be provided as required. The substructure cells are composed of metal layers (such as steel layers) and non-metal layers (such as Rubber layers) are alternately superimposed, forming a primary and secondary cascade system with the main structure of the phononic crystal, and have a certain degree of vibration reduction effect on both high-frequency and low-frequency bands.

Embodiment 3

[0047] This embodiment is a multi-cascade phononic crystal vibration isolator whose elastic element is a polymer material, and its basic structure is similar to that described in Embodiment 1. In particular, in this embodiment, the central rigid element 7 is a cylindrical structure, and the circumferential elastic element 8 is a hollow cylindrical structure. The central stiffness element 7 is preferably a hard polymer material (such as a synthetic resin material), and the circumferential elastic element 8 is preferably a soft polymer material (such as a rubber material). For the schematic diagram of the main structure of the phononic crystal in this embodiment, please refer to Figure 8 , Figure 9 .

[0048]

[0049] The invention is an assembled structure, and the outer cylinder of the vibration isolator is embedded in the floating plate to form a main vibration system. Arrange the limit device on the base corresponding to the central axis of the outer cylinder, put the ...

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Abstract

According to a multi-cascade phononic crystal vibration isolator, phononic crystal cells are arranged in the multi-cascade phononic crystal vibration isolator, a band gap within the frequency band range of 50 Hz to 200 Hz and 1000 Hz to 2000 Hz is generated, vibration of a specific frequency band is eliminated through the band gap, and therefore vibration reduction of a track is achieved, the multi-cascade phononic crystal vibration isolator is of a cylindrical structure and is divided into a vibration isolator outer cylinder structure and a vibration isolator inner cylinder structure; the vibration isolator inner cylinder structure is composed of an inner cylinder and a multi-cascade photonic crystal vibration isolator main body structure, the multi-cascade photonic crystal vibration isolator main body structure is placed in the inner cylinder and is formed by combining a plurality of photonic crystal cells and a bearing top plate, and each cell is composed of a mass element and an elastic element. Characteristics of the circumferential elastic element are brought into full play, and parameter optimization design is facilitated; the isolator has the advantages of being convenient to install, good in compatibility with an outer cylinder and an inner cylinder of an existing floating slab vibration isolator and the like, and has wide applicability in the field of rail transit vibration and noise reduction.

Description

technical field [0001] The invention belongs to the technical field of rail transit and relates to a multi-cascade phonon crystal vibration isolator. Background technique [0002] With the continuous development of rail transit technology, more and more attention has been paid to the environmental protection of rail transit, especially the noise and vibration generated by it. [0003] At present, the vibration and noise reduction measures of rail transit mainly start from three aspects: control on the vibration source / sound source (rail grinding, installation of dynamic vibration absorbers, etc.), control on the transmission path (by using elastic fasteners and floating plates) track, etc.) and on-receiver / acceptor controls. Floating slab tracks are the most effective compared to other vibration reduction measures. [0004] The floating plate track includes traditional steel spring floating plate, rubber spring floating plate, and new rubber vibration damping pad floating ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E01B19/00E02D31/08F16F15/04F16F15/06F16F15/08
CPCE01B19/003E02D31/08F16F15/085
Inventor 杨新文张昭汪永健赵治钧
Owner TONGJI UNIV
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