Demonstration of a Wireless, Self-Powered Electroacoustic Liner System
Publication Type:
Journal
Authors:
Co-Authors:
Phipps, A., Liu, F., Sheplak, M., and Nishida, T.
Year Published:
2009
Abstract:
This paper demonstrates the system operation of a self-powered active liner for the suppression of aircraft engine noise. The fundamental element of the active liner system is an electromechanical Helmholtz resonator (EMHR), which consists of a Helmholtz resonator with one of its rigid walls replaced with a circular piezoceramic composite plate. For this system demonstration, two EMHR elements are used, one for acoustic impedance tuning and one for energy harvesting. The EMHR used for acoustic impedance tuning is shunted with a variable resistive load, while the EMHR used for energy harvesting is shunted to a flyback power converter and storage element. The desired acoustic impedance conditions are determined externally, and wirelessly transmitted to the liner system. The power for the receiver and the impedance tuning circuitry in the liner are supplied by the harvested energy. Tuning of the active liner is demonstrated at three different sound pressure levels (148, 151, and 153dB) in order to show the robustness of the energy harvesting and storage system. An acoustic tuning range of approximately 200Hz is demonstrated for each of the three available power levels.
Journal:
Journal of the Acoustical Society of America
Volume:
125
Issue:
2
Pagination:
873-881
ISSN:
Short Title:
Date Published:
2/4/2009