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dc.contributor.authorBlanc, Arthuren_US
dc.date.accessioned2014-03-14T20:45:28Z
dc.date.available2014-03-14T20:45:28Z
dc.date.issued2001-07-27en_US
dc.identifier.otheretd-09172001-144121en_US
dc.identifier.urihttp://hdl.handle.net/10919/35080
dc.description.abstractAn innovative implementation of the skin concept for the reduction of the radiated sound power from a vibrating structure is proposed. The skin has a periodic structure and continuously covers a vibrating beam. Thus, this skin decouples the vibrating structure from the acoustic field by modifying the wavenumber spectrum of the radiating surface. First, structural acoustics and periodic structure theories are reviewed in order to predict how bending waves propagate along a periodic beam and how this beam radiates sound. These theories are then extended to the case of multi-layered structures in order to understand the behavior of a beam loaded with a periodic skin. In order to design the beam and skin structural periods, two different methods are used: Galois sequences and an optimization process using a real-valued genetic algorithm. Simulations are run for the case of periodic beams and beams coupled with periodic smart skins in both finite and infinite configurations. Results show that periodic beam can radiate less sound than equivalent uniform structures. Results also show the potential of periodic skin for application to the structural radiation problem for frequencies higher than approximately 100Hz with an approximately 10dB of radiated sound power attenuation.en_US
dc.publisherVirginia Techen_US
dc.relation.haspartBlanc_MsThesis.pdfen_US
dc.rightsI hereby certify that, if appropriate, I have obtained and attached hereto a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee. I hereby grant to Virginia Tech or its agents the non-exclusive license to archive and make accessible, under the conditions specified below, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report.en_US
dc.subjectbending wavesen_US
dc.subjectsmart skinen_US
dc.subjectsound radiationen_US
dc.subjectperiodic structuresen_US
dc.subjectstructural acousticsen_US
dc.titleControl of Sound Radiation From Structures with Periodic Smart Skinsen_US
dc.typeThesisen_US
dc.contributor.departmentMechanical Engineeringen_US
thesis.degree.nameMaster of Scienceen_US
thesis.degree.levelmastersen_US
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen_US
dc.contributor.committeechairFuller, Christopher R.en_US
dc.contributor.committeememberJohnson, Martin E.en_US
dc.contributor.committeememberBurdisso, Ricardo A.en_US
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-09172001-144121/en_US
dc.date.sdate2001-09-17en_US
dc.date.rdate2002-09-21
dc.date.adate2001-09-21en_US


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