Acoustic impedance adjustment device and adjustment method based on adaptive micro-perforated plate sound absorber

Abstract

The invention relates to an acoustic impedance adjustment device and adjustment method based on an adaptive micro-perforated plate sound absorber. The acoustic impedance adjustment device includes a noise detector, an adaptive controller, a piezoelectric film drive circuit and a piezoelectric film micro-perforation Board sound absorber. The acoustic impedance adjustment method is based on the incident noise source signal detected by the noise detector in real time, using an adaptive controller to analyze the frequency and sound pressure of the signal, and controlling the piezoelectric film drive circuit to output an optimized excitation voltage to drive the piezoelectric film micro The perforated plate produces a certain vibration velocity, which in turn changes the acoustic impedance of the sound absorber. The invention can optimize the sound absorption coefficient of the resonant sound-absorbing structure of the micro-perforated plate in real time, greatly expand the effective sound-absorbing frequency band of the resonant sound-absorbing structure of the micro-perforated plate, and realize noise reduction on demand.

Description

technical field [0001] The invention relates to the technical field of micro-perforated plate sound absorbers, in particular to an acoustic impedance adjustment device based on an adaptive micro-perforated plate sound absorber and an adjustment method thereof. Background technique [0002] In today's society, science and technology are developing rapidly, and the pace of social progress is accelerating. However, the accompanying radiation noise has also brought a lot of harm to all aspects of people's production and life. Research and control of noise is not only an urgent need to protect the environment, but also a problem that must be solved to improve the quality of industrial products and reduce energy consumption. [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 tradi...

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Problems solved by technology

However, the multilayer composite structure obviously increases the structural complexity, and also greatly increases the cost of materials and processing, and is also limited by the space distance in practical engineering applications.

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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