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Experiments on active isolation using distributed PVDF error sensorsA control system based on a two-channel narrow-band LMS algorithm is used to isolate periodic vibration at low frequencies on a structure composed of a rigid top plate mounted on a flexible receiving plate. The control performance of distributed PVDF error sensors and accelerometer point sensors is compared. For both sensors, high levels of global reduction, up to 32 dB, have been obtained. It is found that, by driving the PVDF strip output voltage to zero, the controller may force the structure to vibrate so that the integration of the strain under the length of the PVDF strip is zero. This ability of the PVDF sensors to act as spatial filters is especially relevant in active control of sound radiation. It is concluded that the PVDF sensors are flexible, nonfragile, and inexpensive and can be used as strain sensors for active control applications of vibration isolation and sound radiation.
Document ID
19920061576
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Lefebvre, S.
(NASA Langley Research Center Hampton, VA, United States)
Guigou, C.
(NASA Langley Research Center Hampton, VA, United States)
Fuller, C. R.
(Virginia Polytechnic Institute and State University Blacksburg, United States)
Date Acquired
August 15, 2013
Publication Date
May 22, 1992
Publication Information
Publication: Journal of Sound and Vibration
Volume: 155
Issue: 1, Ma
ISSN: 0022-460X
Subject Category
Instrumentation And Photography
Accession Number
92A44200
Distribution Limits
Public
Copyright
Other

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