COMPARISON OF ACTIVE NOISE CONTROL STRUCTURES IN THE PRESENCE OF ACOUSTICAL FEEDBACK BY USING THEH∞SYNTHESIS TECHNIQUE

✍ Scribed by M.R. Bai; H.H. Lin

• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 285 KB
• Volume: 206
• Category: Article
• ISSN: 0022-460X
• DOI: 10.1006/jsvi.1997.1101

✦ Synopsis

This study compares three control structures of active noise cancellation for ducts: feedback control, feedforward control, and hybrid control. These structures are compared in terms of performance, stability, and robustness by using a general framework of the Ha robust control theory. In addition, the Ha synthesis procedure automatically incorporates the acoustic feedback path that is usually a plaguing problem to feedforward control design. The controllers are implemented by using a digital signal processor and tested on a finite-length duct. In an experimental verification, the proposed controllers are also compared with the well-known filtered-u least mean square (FULMS) controller. The advantages and disadvantages of each ANC structure as well as the adverse effects due to acoustic feedback are addressed.