NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Active control of structurally-coupled sound fields in elastic cylinders by vibrational force inputsActive control of structurally-coupled sound fields in elastic cylinders is analytically and experimentally studied. The primary (noise) field in the cylinder model is generated by the coupled dynamic response of the shell under loading by a single exterior acoustic source. Control of the interior sound field is achieved by applying vibrational force inputs directly to the shell wall. Action of the point controllers serve to increase the input impedance of select structural modes of the shell which are well-coupled to the interior acoustic cavity, thus substantially reducing sound transmission into the cavity. Spatially-averaged noise reductions in excess of 30 dB are demonstrated for acoustic resonant conditions within the cavity. Twin controller configurations are presented which demonstrate the ability to independently control orthogonal modes of the interior acoustic space. Benefits and drawbacks of this new methodology for noise control are discussed and clearly demonstrated.
Document ID
19900059922
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Jones, J. D.
(Purdue University West Lafayette, IN, United States)
Fuller, C. R.
(Virginia Polytechnic Institute and State University Blacksburg, United States)
Date Acquired
August 14, 2013
Publication Date
July 1, 1990
Publication Information
Publication: International Journal of Analytical and Experimental Modal Analysis
Volume: 5
ISSN: 0886-9367
Subject Category
Acoustics
Accession Number
90A46977
Funding Number(s)
CONTRACT_GRANT: NAG1-390
Distribution Limits
Public
Copyright
Other

Available Downloads

There are no available downloads for this record.
No Preview Available