Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

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

A technology of micro-perforated plates and adjustment devices, which is applied in the direction of sound-generating devices and instruments, can solve the problems of inability to use micro-perforated plates, increase material and processing costs, and space distance limitations, and achieve simple structure and manufacturing process, and effective expansion The effect of absorbing sound frequency and saving occupied space

Inactive Publication Date: 2018-01-19
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Acoustic impedance adjustment device and adjustment method based on adaptive micro-perforated plate sound absorber
  • Acoustic impedance adjustment device and adjustment method based on adaptive micro-perforated plate sound absorber
  • Acoustic impedance adjustment device and adjustment method based on adaptive micro-perforated plate sound absorber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0047] Below in conjunction with accompanying drawing, the present invention will be further described, and the present invention is applicable to single-layer or multi-layer piezoelectric film micro-perforated sound absorbers:

[0048] Such as figure 1 Shown is an acoustic impedance adjustment device based on an adaptive micro-perforated plate sound absorber, the adjustment device includes a noise detector 100, an adaptive controller 200, a piezoelectric film drive circuit 300, and a piezoelectric film micro-perforated plate sound-absorbing Body 400. The adaptive controller 200 includes a signal analysis module 201 and an impedance adjustment signal calculation module 202 . The piezoelectric film drive circuit 300 includes a dual-channel DC stabilized power supply 301 , a signal amplifier circuit 302 and an audio transformer 303 . The dual-channel DC stabilized power supply 301 is used to supply power to the signal power amplifier circuit 302 . The piezoelectric film micro...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

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...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G10K11/172
Inventor 王焕钦李子博朱利凯孔德义刘淑梅段秀华李山山殷世平
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products