Development of a laser-based automated mechanical mobility measurement system for one-dimensional experimental modal analysis

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dc.contributor.authorAgee, Barry L.en
dc.contributor.committeechairMitchell, Larry D.en
dc.contributor.committeememberWicks, Alfred L.en
dc.contributor.committeememberWest, Robert L. Jr.en
dc.contributor.departmentMechanical Engineeringen
dc.date.accessioned2014-03-14T21:50:53Zen
dc.date.adate2009-12-04en
dc.date.available2014-03-14T21:50:53Zen
dc.date.issued1992-02-13en
dc.date.rdate2009-12-04en
dc.date.sdate2009-12-04en
dc.description.abstractA laser-based automated mechanical mobility measurement system has been developed that can obtain a very high spatial resolution of frequency response functions (FRFs) for experimental modal analysis where one-dimensional structural motion predominates. With this system FRFs are measured and recorded in a format that is readily imported into a popular modal analysis software. A scanning laser Doppler velocimeter is coupled to a multi-channel FFf analyzer system for efficient data collection and management of spatially distributed FRFs. The objectives in designing this measurement system is to take advantage of the laser's non-contacting nature, its high spatial resolution, and its fast point-to-point movement. By using the scanning capabilities of the laser, experimental mobility FRF data can be collected in those structures that have dominant response in one direction at up to 16,000,000 positions. Moreover, the laser does not mass load the structure thus making the structure time invariant unlike "roving" accelerometers. The design and implementation of this automated mechanical mobility measurement system is presented. Instrumentation interfacing and control issues as well as software development issues are addressed in this thesis. Procedures required to implement the laser-based measurement system are presented. The performance of the laser-based system is presented along with an illustrative example of its use on a free-free rectangular plate where the vibration response is primarily in one direction.en
dc.description.degreeMaster of Scienceen
dc.format.extentxv, 157 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-12042009-020017en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-12042009-020017/en
dc.identifier.urihttp://hdl.handle.net/10919/46076en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V855_1992.A333.pdfen
dc.relation.isformatofOCLC# 25753566en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V855 1992.A333en
dc.subject.lcshMotion control devicesen
dc.subject.lcshMotion -- Measurementen
dc.titleDevelopment of a laser-based automated mechanical mobility measurement system for one-dimensional experimental modal analysisen
dc.typeThesisen
dc.type.dcmitypeTexten
thesis.degree.disciplineMechanical Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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