Transmitted Noise Reduction Performance of Piezoelectric Single Panel through Piezo-damping

압전감쇠를 통한 압전단일패널의 전달 소음저감성능

  • 이중근 (㈜NSV 기술연구소) ;
  • 김재환 (인하대학교 기계공학과) ;
  • 김기선 (천안공업대학 기계공학과) ;
  • 이형식 (대전기능대학 컴퓨터응용기계과)
  • Published : 2001.12.01

Abstract

The possibility of a noise reduction of piezoelectric single Panels is experimentally studied. Piezoelectric single panel is basically a plate structure on which piezoelectric patch with shunt circuit is mounted. The use of piezoelectric shunt damping can reduce the transmission at resonance frequencies of the panel structure. Piezo-damping is implemented by using a newly proposed tuning method. This method is based on electrical impedance model and maximizing the dissipated energy at the shunt circuit. By measuring the electrical impedance at the piezoelectric patch bonded on a structure, an equivalent electrical model is constructed near the system resonance frequency. Resonant shunt circuit for piezoelectric shunt damping is composed of register and inductor in series, and they are determined by maximizing the dissipated energy throughout the circuit. The transmitted noise reduction performance of single Panel is tested on an acoustic tunnel. The tunnel is a tube with a square cross section and a loud speaker is mounted at one side of the tube as a sound source. Panels are mounted in the middle of the tunnel and the transmitted sound pressure across Panels is measured. By enabling the piezoelectric shunt damping noise reduction is achieved at the resonance frequencies as well. Piezoelectric single panel with piezoelectric shunt damping is a promising technology for noise reduction in a broadband frequency.

Keywords

Electrical impedance model;Energy dissipation;Resonant shunt;Piezo-damping