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Design method of honeycomb-microperforated film composite structure

A design method and composite structure technology, applied in the direction of sound-emitting devices, instruments, layered products, etc., can solve the problems that it is difficult to adjust the sound absorption coefficient and sound absorption frequency band of the composite structure at any time, and change the environmental noise, and achieve engineering manufacturing Easy, wide-ranging application prospects

Active Publication Date: 2019-08-02
NANCHANG HANGKONG UNIVERSITY
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Problems solved by technology

Judging from the existing research results, once the traditional honeycomb-micro-perforated composite structure is assembled, the honeycomb sandwich structure has a fixed absorption of noise, without changing the internal shape of the honeycomb-micro-perforated composite structure, it is difficult to adjust the composite structure at any time Sound absorption coefficient and sound absorption frequency band
Not suitable for the changeable environmental noise in various fields of modern life and production

Method used

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  • Design method of honeycomb-microperforated film composite structure
  • Design method of honeycomb-microperforated film composite structure
  • Design method of honeycomb-microperforated film composite structure

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Embodiment Construction

[0036] The present invention will be described in detail below in conjunction with the accompanying drawings. see Figure 2 to Figure 6 .

[0037] In order to obtain better sound-absorbing properties of the honeycomb sandwich structure, the present invention considers that the upper surface plate 1 is made into a micro-perforated plate, such as figure 2 shown.

[0038] in such as figure 2 Take out a honeycomb core 6 in the shown honeycomb sandwich structure, and add a piece inside the honeycomb core 6 Figure 5 As shown in the DE micro-perforated film 3, since the size of the DE micro-perforated film 3 installed in the honeycomb core is relatively small, regardless of the additional acoustic impedance caused by the vibration of the film itself, the upper and lower sides of the DE micro-perforated film 3 are first plated with a certain thickness of The conductive electrode is then connected with an external voltage generating terminal 5 by a lead wire 4 . Wherein, the DE...

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Abstract

The invention designs a novel honeycomb-microperforated film composite structure with electrically adjustable sound absorption performance based on a composite material honeycomb panel structure. Thedesign of the novel honeycomb-microperforated film composite structure comprises the following steps: calculating according to a theoretical model of a double-layer microperforated plate to obtain a perforation aperture and the influence of a perforation rate on the sound absorption performance of the structure; designing a DE microperforated film which can change the microperforation parameters by controlling an external voltage; carrying out numerical simulation and calculating to find a perforation rate adjustment range which is more suitable for adjustment. A design method provided by theinvention is simple in principle; the characteristic of adjustable sound absorption peak can be realized only by partially adding the honeycomb-microperforated film composite structure into the traditional honeycomb structure. The novel honeycomb-microperforated film composite structure is high in practicality and easy to operate and popularize.

Description

technical field [0001] The invention belongs to a low-noise design method of a honeycomb-micro-perforated film composite structure, in particular to a design method of a honeycomb-micro-perforated film composite structure with an electrically adjustable sound absorption frequency. Background technique [0002] Honeycomb sandwich composite structure is a kind of structure widely used in the field of aviation and construction engineering with light-weight characteristics while retaining the corresponding physical properties. Ordinary honeycomb sandwich panel structure has the characteristics of sound insulation. In order to achieve the integrated design of sound absorption and insulation, it is necessary to use additional porous materials to achieve the purpose of sound absorption, which results in a large amount of additional structural weight. For aviation, It is undoubtedly a fatal shortcoming in the field of construction. Therefore, it is of great significance to study th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10K11/172G10K11/168B32B3/12B32B3/24
CPCG10K11/172G10K11/168B32B3/12B32B3/266B32B2307/102
Inventor 张翔吴锦武
Owner NANCHANG HANGKONG UNIVERSITY
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