Smart acoustically active surfaces
作者:
F. Douglas Shields,
L. Dwynn Lafleur,
期刊:
The Journal of the Acoustical Society of America
(AIP Available online 1997)
卷期:
Volume 102,
issue 3
页码: 1559-1566
ISSN:0001-4966
年代: 1997
DOI:10.1121/1.420102
出版商: Acoustical Society of America
数据来源: AIP
摘要:
The use of such materials as PVDF and piezorubber in making smart acoustically active surfaces is discussed and demonstrated. By using one layer as a sensor and applying the signal detected in this layer through an amplifier and filter to a second driving layer it is possible to control either the reflection or transmission of plane waves striking the surface normally. By using two driving layers, both transmission and reflection can be simultaneously controlled. When transmissions are eliminated the control of reflection is independent of changes in backing impedance. By adding a second sensing layer along with two driving layers, reflections and radiation from a vibrating surface can be eliminated simultaneously. Stability problems involved in using pressure and/or velocity sensors in various control algorithms are discussed.
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