Sound absorption bandwidth increasing type micro-perforated plate sound absorber based on piezoelectric material

Abstract

The invention provides a sound absorption bandwidth increasing type micro-perforated plate sound absorber based on a piezoelectric material. The sound absorber comprises a micro-perforated plate soundabsorber body, wherein the micro-perforated plate sound absorber body is of a Helmholtz resonator structure and comprises a piezoelectric micro-perforated plate, a rigid wall and a back cavity; the front surface and the back surface of the piezoelectric micro-perforated plate are divided into a plurality of areas at intervals; each area is plated with a conductive material coating to form an electrode area; each area is subjected to voltage excitation by a respective excitation circuit; the number of voltage excitation applied to each area is 1; each excitation circuit comprises a direct-current power supply, a power amplifier, a transformer and a signal generator; one end of each transformer is connected with the electrode area of the piezoelectric micro-perforated plate, and the other end of each transformer is connected with the respective power amplifier; and the power amplifiers are powered by the direct-current power supplies through signals input by the signal generators. According to the sound absorber, the sound absorption coefficient of the micro-perforated plate sound absorber can be optimized, meanwhile, the noise of the PVDF micro-perforated plate can be inhibited, and the sound absorption bandwidth of the micro-perforated plate sound absorber based on the piezoelectric material can be greatly increased.

Description

technical field [0001] The invention relates to a micro-perforated plate sound absorber, in particular to a micro-perforated plate sound absorber with increased sound absorption bandwidth based on piezoelectric materials, which belongs to the technical field of acoustics. Background technique [0002] In the rapidly developing modern society, with the continuous acceleration of the industrialization process, the accompanying noise pollution has also brought great troubles to people's production and life. Eliminating noise pollution and improving the living environment are the common voice of the whole society, so noise must be studied and controlled. [0003] There are three main measures for noise control, one is to control the noise source; the other is to control the transmission of noise; the third is to take isolation measures on the receiver to reduce the harm of noise to the receiver. It is a traditional and effective technology to control the transmission path, incl...

AI Technical Summary

Problems solved by technology

However, the multilayer composite structure significantly increases the structural complexity based on piezoelectric materials, and also greatly increases the cost of materials and processing based on piezoelectric materials. In practical engineering applications, it is also limited by the space distance.

The second method is to place sound-absorbing material on the back of the single-layer micro-perforated plate, but adding sound-absorbing material will bring secondary pollution to the entire structure, and the advantages of the micro-perforated plate as a green and environmentally friendly sound-absorbing material cannot be brought into play

However, the active sound absorption control system makes the structure of the entire sound absorber too complicated, and it is more likely to be limited by the space distance in practical applications

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