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dc.contributor.authorStafford, Joseph F.en
dc.date.accessioned2014-03-14T21:40:52Zen
dc.date.available2014-03-14T21:40:52Zen
dc.date.issued1976en
dc.identifier.otheretd-07212010-020106en
dc.identifier.urihttp://hdl.handle.net/10919/43822en
dc.description.abstractA system of software has been developed for the simulation of structural dynamic modal testing by the method of steady-state sinusoidal excitation by discrete shakers. An analytical method commonly known as Asher's Method was employed to optimize the shaker forceamplitude distributions for the purpose of isolating individual modes of vibration. The method involves the use of transfer functions of the structure to determine the natural frequencies and force-amplitude distributions. Each force-amplitude distribution was used in the calculation of the coincident and quadrature displacements for the associated modes of vibration. Narrow-band frequency sweeps were used to determine the purity of isolated modes through the use of coincident-quadrature response plots in the Argand plane. In addition, modal energies of partially isolated modes were examined for the effects of interfering modes, again as a measure of modal purity.en
dc.format.extentxi, 103 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.publisherVirginia Techen
dc.relation.isformatofOCLC# 39285035en
dc.relation.haspartLD5655.V855_1976.S725.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V855 1976.S725en
dc.titleA numerical simulation of multiple-shaker model testingen
dc.typeThesisen
dc.contributor.departmentAerospace and Ocean Engineeringen
dc.description.degreeMaster of Scienceen
thesis.degree.nameMaster of Scienceen
thesis.degree.levelmastersen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.disciplineAerospace and Ocean Engineeringen
dc.type.dcmitypeTexten
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-07212010-020106/en
dc.date.sdate2010-07-21en
dc.date.rdate2010-07-21en
dc.date.adate2010-07-21en


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