WU Jingbiao JIANG Zhe ZHU Lifeng

(Institute of the Vibration and Noise, Jiangsu University  Zhenjiang 212013)

Received Mar. 23, 2009

Revised Apr. 22, 2009

Abstract With the theory of radiation modes, piezoceramics are used as control actuators in the active control of sound radiation. According to the characteristics of the first four radiation mode shapes, the arrangement of four group of actuators is presented. Theoretical analysis and numerical calculation demonstrate that the four group of actuators can not only reduce the sound power effectively, but also decouple the control equations. While controlling of the sound powers of the first four radiation modes, these actuators can convert the complicated control system with multiple input/output into several simple and independent systems with single input/output.

PACS numbers: 43.50,43.40