Active control of sound radiation from a simply supported beam: Influence of bending near-field waves

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dc.contributorVirginia Tech. Department of Mechanical Engineering. Vibration and Acoustics Laboratoriesen
dc.contributor.authorGuigou, Catherineen
dc.contributor.authorFuller, Chris R.en
dc.contributor.departmentMechanical Engineeringen
dc.date.accessed2015-05-12en
dc.date.accessioned2015-05-27T19:50:23Zen
dc.date.available2015-05-27T19:50:23Zen
dc.date.issued1993-05-01en
dc.description.abstractActive control of sound radiation from a baffled simply supported finite beam is analytically studied. The beam is subjected to a harmonic input force and the resulting acoustic field is minimized by applying a control point force. For a single frequency, the flexural response of the beam subject to the input and control forces is expressed in terms of flexural waves of both propagating and near-field types. The optimal control force complex amplitude is derived by minimizing the acoustic radiated pressure at one point located in the far field. The far-field radiated pressure, the displacement of the vibrating beam, and the one-dimensional wave-number spectrum of the beam velocity are extensively studied. In order to further understand control mechanisms, the radiated pressure due to the flexural propagating wave and the flexural near-field wave, respectively, is investigated at the minimization point before and after the control is involved. The analysis shows that, when the control is applied, the combination of the radiated pressure due to the two different types of waves (as their associated radiation is out-of-phase) at the minimization point causes the large pressure attenuation. These results demonstrate that structural near fields are important in terms of predicting performance in active control of structurally radiated sound.en
dc.description.sponsorshipUnited States. Office of Naval Research - Grant No. ONR-N00014-92-J-1170en
dc.format.extent10 pagesen
dc.format.mimetypeapplication/pdfen
dc.identifier.citationGuigou, C., & Fuller, C. R. (1993). Active control of sound radiation from a simply supported beam: Influence of bending near-field waves. Journal of the Acoustical Society of America, 93(5), 2716-2725. doi: 10.1121/1.405847en
dc.identifier.doihttps://doi.org/10.1121/1.405847en
dc.identifier.issn0001-4966en
dc.identifier.urihttp://hdl.handle.net/10919/52689en
dc.identifier.urlhttp://scitation.aip.org/content/asa/journal/jasa/93/5/10.1121/1.405847en
dc.language.isoen_USen
dc.publisherAcoustical Society of Americaen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectAcoustic wavesen
dc.subjectRadiation monitoringen
dc.subjectAcousticsen
dc.subjectStructural beam vibrationsen
dc.subjectAcoustic radiation pressureen
dc.titleActive control of sound radiation from a simply supported beam: Influence of bending near-field wavesen
dc.title.serialJournal of the Acoustical Society of Americaen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten

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