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Resonance sound-absorbing structure for sheet

A resonant sound-absorbing, thin-plate technology, applied in the direction of sound-generating devices, instruments, etc., can solve the problems of increasing the weight of sound-absorbing structures, great influence of damping effect, and low sound-absorbing coefficient, and achieve light weight, small installation space, and improved absorption The effect of sound coefficient

Inactive Publication Date: 2008-12-24
INST OF ACOUSTICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0003] The disadvantage of this kind of thin-plate resonance sound-absorbing structure is that the sound absorption coefficient is relatively low, and the constrained damping layer will greatly increase the weight of the sound-absorbing structure, and its damping effect is greatly affected by changes in temperature and the like.
If the cavity is filled with fiber or foam material, it will also pollute the environment

Method used

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  • Resonance sound-absorbing structure for sheet
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  • Resonance sound-absorbing structure for sheet

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Embodiment 1

[0023] This embodiment is a thin-plate sound-absorbing structure applied to low frequencies. figure 2 Shown is the structural representation of this embodiment, it and figure 1 The main difference of the thin-plate resonant sound-absorbing structure shown is that the constrained damping layer 2 is replaced by a piezoelectric ceramic sheet 6 . The advantage is that the equivalent damping coefficient of the piezoelectric ceramic sheet can be adjusted through the parameters of the shunt circuit, so that the sound absorption coefficient of the metal plate can be controlled, and it can be greatly improved near the resonance frequency. Moreover, the piezoelectric ceramic sheet is lighter than the constrained damping layer, and its damping characteristics are not affected by environmental factors such as temperature. In addition, the thin-plate resonance sound-absorbing structure of the present invention does not need to close the cavity, which greatly reduces the installation spac...

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Abstract

The invention relates to a thin plate resonance sound absorption structure which comprises a metal thin plate and a piezoelectric ceramic piece pasted on the metal thin plate. A resistor is connected between the two poles of the piezoelectric ceramic piece. The structure of the invention can fulfill the following technical effects of: being capable of effectively improving acoustical absorptivity at the basic frequency of the thin plate, tuning out another sound absorption peak through adjusting inductance and effectively widening the width of sound absorption frequency band through the combination of the sound absorption peak tuned out and the basic frequency sound absorption peak of the thin plate. Besides, the structure of the invention has light weight and small installation space and the acoustical absorptivity around the resonance frequency can reach more than 0.9.

Description

technical field [0001] The invention belongs to the field of sound absorption control, in particular, the invention relates to a thin plate sound absorption structure. Background technique [0002] The thin-plate resonant sound-absorbing structure is a low-frequency sound-absorbing structure. The basic principle of sound absorption is that when the sound wave is incident on the surface of the plate, the modal vibration of the plate is excited, the sound energy is converted into the vibration energy of the plate, and the damping of the plate is used. Loss, the vibration energy of the board is converted into heat energy, so as to achieve the purpose of sound absorption. The boards of this sound-absorbing structure are usually made of wood, metal materials, plastics and the like. Due to the relatively small loss factor of these materials, the sound absorption coefficient in the first mode is usually very low. In order to provide sufficient damping and improve the sound absorp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10K11/172
Inventor 常道庆刘克田静
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI
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