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Conformal embedded metamaterial structure for low-frequency vibration and noise reduction of corrugated sandwich board

A vibration and noise reduction, sandwich panel technology, applied in the direction of shock absorbers, elastic shock absorbers, friction shock absorbers, etc., can solve the problems of complex processing and installation, occupying extra space, high cost, etc., to overcome the problem of processing And the effect of complex installation, low processing and manufacturing costs, and convenient installation

Active Publication Date: 2021-06-25
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problems existing in the above-mentioned background technology and provide a conformal embedded metamaterial structure for low-frequency vibration and noise reduction of corrugated sandwich panels. The metamaterial structure has both low-frequency sound insulation, vibration reduction and acoustic It has excellent radiation suppression performance, and is easy to manufacture and install, low in cost, high in reliability, and does not occupy additional space. It overcomes the complex processing and installation, high cost, and Poor reliability, and many disadvantages such as taking up extra space

Method used

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  • Conformal embedded metamaterial structure for low-frequency vibration and noise reduction of corrugated sandwich board
  • Conformal embedded metamaterial structure for low-frequency vibration and noise reduction of corrugated sandwich board
  • Conformal embedded metamaterial structure for low-frequency vibration and noise reduction of corrugated sandwich board

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Embodiment 1

[0059] The shape of the arrayed elastic element 1b is selected as a rectangle, with a length of 76mm, a width of 20mm, and a thickness of 0.8mm, and the material is steel; the cross-sectional shape of the arrayed mass element 2 is selected as a rectangle, with a length of 20mm and a width of 20mm, and its height is 20mm. The material is steel; for the convenience of calculation, the damping element 3 attached to the elastic element 1b is equivalent to the damping of the elastic element, and the loss factor is taken as 0.1; the shape of the arrayed through hole 4 is rectangular, 76mm long and 10mm wide ;A sound insulation study was carried out on the typical corrugated sandwich panel structure of the floor aluminum profile of a certain type of high-speed train. The span of the cells is about 130mm. Periodic boundary conditions are applied when calculating sound insulation. Calculation results refer to Image 6 , compared with the light sandwich panel, in the wide low frequency...

Embodiment 2

[0061] The shape of the arrayed elastic element 1b is selected as a rectangle, with a length of 76mm, a width of 20mm, and a thickness of 0.8mm, and the material is steel; the cross-sectional shape of the arrayed mass element 2 is selected as a rectangle, and the length and width of each mass element are 20mm , there are three kinds of heights, namely 25mm, 15mm, 10mm, arranged in order according to the way of 25mm-15mm-10mm-25mm..., the material is steel; for the convenience of calculation, the damping element 3, etc. The effect is the damping of the elastic element, and the loss factor is 0.1; the shape of the arrayed through-hole 4 is rectangular, with a length of 76 mm and a width of 10 mm; the vibration reduction research is carried out for the corrugated sandwich panel structure in Case 1, and the structural length is selected as 1440 mm. A unit side load is applied at one end of the structure. Refer to the calculation results of vibration displacement response Figure ...

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Abstract

The invention provides a conformal embedded metamaterial structure for low-frequency vibration and noise reduction of a corrugated sandwich board. The conformal embedded metamaterial structure comprises a matrix structure body, mass elements arranged in an array and through holes arranged in an array mode, wherein the matrix structure body comprises elastic elements arranged in an array mode and a conformal support substructure; the conformal supporting substructure is arranged at the two ends of the elastic elements arranged in an array mode; the elastic elements arranged in an array mode are sequentially spaced by the through holes arranged in an array mode to realize arrayed arrangement, and each elastic element is provided with a mass element; each elastic element and the mass element arranged on the elastic element form a local resonance microstructure unit, and the local resonance microstructure units are arranged in an array mode, so that the conformal embedded metamaterial structure can generate a local resonance effect, elastic wave propagation in the corrugated sandwich board is restrained, and therefore, the corrugated sandwich board has strong low-frequency sound insulation capability and low-frequency vibration and radiation noise suppression capability.

Description

technical field [0001] The invention belongs to the fields of new materials and new structures for vibration and noise control, and in particular relates to a material structure for low-frequency vibration and noise reduction of corrugated sandwich panels. Background technique [0002] The corrugated sandwich panel is composed of upper and lower surface panels and a single or multi-layer corrugated web core layer. It has the advantages of light weight, high rigidity and high strength, and has been widely used in defense equipment, transportation and other fields. Since this type of structure can be manufactured in a large size through extrusion molding, in some fields, this type of structure is also called hollow extrusion profile, or simply hollow profile. However, this lightweight structure is easily excited by low-frequency vibration and noise, which affects the ride comfort of the equipment, endangers the health of the occupants, and reduces the reliability and service l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16F7/08F16F7/12
CPCF16F7/08F16F7/12F16F7/128
Inventor 肖勇郭佳佳王帅星胡洋华温激鸿郁殿龙李永强朱智军
Owner NAT UNIV OF DEFENSE TECH