Feedforward and Feedback Control Strategy for Active Noise Cancellation in Ducts

[+] Author and Article Information
Jwu-Sheng Hu

Department of Control Engineering, National Chao-Tung University, 1001 Ta Hsueh Road, Hsinchu, Taiwan

J. Dyn. Sys., Meas., Control 118(2), 372-378 (Jun 01, 1996) (7 pages) doi:10.1115/1.2802332 History: Received July 28, 1993; Online December 03, 2007


This paper presents the theoretical work about active noise cancellation in ducts. The proposed control system is designed based on the assumption of a one-dimensional sound field. The controller consists of a feedforward block which serves as a noise observer. The feedback portion of the control algorithm is to minimize residual disturbances. Closed-loop stability of the MIMO (multiple-input-multiple-output) system is analyzed and the result shows that the dynamic influenced by the space-feedforward and feedback controllers can be decoupled. Both semi-infinite and finite-length ducts are considered in this study and simulation examples are given to illustrate the effectiveness of the proposed controllers.

Copyright © 1996 by The American Society of Mechanical Engineers
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