Adaptive Control on the Acoustic Field in a Duct

• Main Authors: Ching-han Yu, 游清翰
• Other Authors: An-Chyau Huang
• Format: Others
• Language: zh-TW
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/xecg2h

碩士 === 國立臺灣科技大學 === 機械工程系 === 94 === Abstract In this paper, we use an adaptive controller based on the function approximation technique for the active noise cancellation in a duct. If the delay time in the secondary path is known, the update laws for the weighting vectors can be selected using Lyapunov-like design so that asymptotic convergence of the output error can be proved. We also discuss the effect of the approximation error on the system performance and some modifications are proposed to robustify the design. Experimental results for reduction in the single-frequency noise and dual-frequency noise cases show that the proposed controller can give consistently better performance compared with the LMS and FXLMS strategies. Keyword：Active noise control, Function Approximation Technique, LMS algorithm, FXLMS algorithm.