TIME-DOMAIN ANALYSIS AND SYNTHESIS OF ACTIVE NOISE-CONTROL SYSTEMS INDUCTS

Citation
Z. Wu et al., TIME-DOMAIN ANALYSIS AND SYNTHESIS OF ACTIVE NOISE-CONTROL SYSTEMS INDUCTS, The Journal of the Acoustical Society of America, 101(3), 1997, pp. 1502-1511
Citations number
24
Categorie Soggetti
Acoustics
ISSN journal
00014966
Volume
101
Issue
3
Year of publication
1997
Pages
1502 - 1511
Database
ISI
SICI code
0001-4966(1997)101:3<1502:TAASOA>2.0.ZU;2-J
Abstract
This paper presents time-domain analysis and synthesis of active low-f requency noise control systems in rigid-walled ducts. In contrast to f requency-domain analysis, time-domain modeling provides a direct physi cal insight of the noise cancellation mechanism, where noise signals a re assumed to be arbitrary real functions of time instead of harmonics . The time-domain analysis is based on a state-space model which is de rived from the governing wave equation using combined numerical (finit e difference) and analytical techniques. Optimal feedback control laws are synthesized for a variety of active noise control systems with di fferent sensor and source arrangements. The responses of closed-loop s ystems are simulated, and the results are compatible with those of tra nsfer function synthesis. In addition, the active control systems so d esigned have the potential of providing global, broadband, and optimal noise reductions without running into the annoying feedback problems in most feedforward control systems. (C) 1997 Acoustical Society of Am erica.