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Proceedings Paper

Acoustic boundary control method for interior sound suppression
Author(s): Jian Q. Sun; S. M. Hirsch
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Paper Abstract

Suppressing interior sound radiation in helicopters, fixed- wing aircraft and land vehicles is a very important problem. It has been studied quite extensively in the past few decades. There are two mainstream methods for this problem: active noise cancellation (ANC) using loudspeakers and sound radiation reduction via structural controls (often called active structural acoustic control or ASAC). An ANC system often requires an impractically high dimensionality to achieve the level of global noise reduction in a three dimensional volume that ASAC systems with a relatively low dimensionality are capable of, while actuators for structural control systems are power intensive and less reliable. This paper presents an acoustic boundary control method that may reserve the advantages of both ANC and ASAC. Numerical simulation results of interior noise control are presented to demonstrate the ability of the acoustic boundary control to cancel sound fields due to different primary sources. A discussion is also presented on the spatial characteristics of the acoustic boundary control as a function of frequency. An interesting phenomenon is discovered that may have significant implications to the actuator grouping studies.

Paper Details

Date Published: 6 June 1997
PDF: 7 pages
Proc. SPIE 3041, Smart Structures and Materials 1997: Smart Structures and Integrated Systems, (6 June 1997); doi: 10.1117/12.275708
Show Author Affiliations
Jian Q. Sun, Univ. of Delaware (United States)
S. M. Hirsch, Univ. of Delaware (United States)

Published in SPIE Proceedings Vol. 3041:
Smart Structures and Materials 1997: Smart Structures and Integrated Systems
Mark E. Regelbrugge, Editor(s)

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