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Device for regulating and controlling low-frequency sound insulation performance of sandwich plate structure and parameter determination method thereof

A technology for determining structural parameters and parameters, applied in chemical instruments and methods, sound-producing instruments, layered products, etc., can solve the problems of low calculation efficiency and large time complexity of the ergodic method, and achieve the effect of improving low-frequency sound insulation performance.

Pending Publication Date: 2021-04-20
ZHEJIANG UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the computational efficiency of the traversal method is low, and the time complexity of the calculation is large

Method used

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  • Device for regulating and controlling low-frequency sound insulation performance of sandwich plate structure and parameter determination method thereof
  • Device for regulating and controlling low-frequency sound insulation performance of sandwich plate structure and parameter determination method thereof
  • Device for regulating and controlling low-frequency sound insulation performance of sandwich plate structure and parameter determination method thereof

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Embodiment

[0052] Taking the UHV converter transformer as an example, the low-frequency components of the noise generated by it are relatively significant and have obvious modulated noise at 100Hz and its high-order harmonics. Conventional sound insulation measures are difficult to achieve a good noise reduction effect. For this reason, for the low-frequency noise radiated by the UHV converter transformer, especially its 3rd harmonic (300Hz) and 4th harmonic (400Hz) noise, the device of this embodiment is designed outside the converter transformer shell, and the The structural parameters of the device are designed in a targeted manner to effectively reduce the 300Hz and 400Hz harmonic noise radiated by it.

[0053] see figure 1 with figure 2 In this embodiment, the device for controlling the low-frequency sound insulation performance of the sandwich panel structure is a sandwich panel structure composed of periodic units 8, and each periodic unit 8 includes a perforated upper panel 1, ...

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Abstract

The invention relates to a device for regulating and controlling low-frequency sound insulation performance of a sandwich plate structure and a parameter determination method thereof, and belongs to the technical field of sound absorption and sound insulation. The device comprises an upper panel, an upper frame, a flexible plate, a lower frame and a lower panel which are sequentially combined from top to bottom, a through hole is formed in the upper panel, and a mass block is arranged on the flexible plate; and the upper frame and the lower frame are the same in structure and are both composed of criss-cross partition plates, the whole device is divided into a plurality of periodic units, and each periodic unit is correspondingly provided with a through hole and a mass block. The low-frequency sound insulation performance of an existing sandwich plate structure can be improved under the condition that the mass (surface density) and the thickness of the sandwich plate are kept unchanged. Meanwhile, a special sound transmission theoretical model can be established for the device to be used for directly calculating the sound insulation index of the device and accurately regulating and controlling the frequency of a sound insulation peak of the device, and has good engineering application prospects.

Description

technical field [0001] The invention relates to the technical field of sound absorption and sound insulation, in particular to a device for regulating the low-frequency sound insulation performance of a sandwich panel structure and a parameter determination method thereof. Background technique [0002] The sandwich panel structure has the advantages of light weight, high rigidity, and good impact resistance. It has been widely used in aerospace, transportation, and construction fields. However, limited by the law of mass, the sound insulation performance of the structure in the middle and low frequency bands is still insufficient. Generally, the sound insulation performance of the sandwich panel structure can be improved by perforating the sound incident side panel of the sandwich panel, inserting a layer of perforated panels in the middle of the sandwich panel, and filling the sandwich panel with porous elastic materials or non-bonded particles. Panneton and Kang et al. use...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10K11/168B32B27/30B32B27/36B32B27/02B32B27/12B32B3/08
Inventor 翟国庆林秦豪董丽奚晓斌佘海林
Owner ZHEJIANG UNIV
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