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A method for the spatial functionalization of the dynamic response of a structure with structural stability considerations

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dc.contributor.authorNeumann, Michael L.en
dc.contributor.departmentMechanical Engineeringen
dc.date.accessioned2014-03-14T21:38:10Zen
dc.date.adate2009-06-11en
dc.date.available2014-03-14T21:38:10Zen
dc.date.issued1993en
dc.date.rdate2009-06-11en
dc.date.sdate2009-06-11en
dc.description.abstractThe scanning Laser Doppler Vibrometer (LDV) has developed into a useful tool for rapidly acquiring spatially dense structural dynamic response information in a noncontacting manner. The research presented in this paper is part of a larger project at the Structural Imaging and Modal Analysis Laboratory in the Department of Mechanical Engineering at Virginia Polytechnic Institute and State University, Blacksburg, VA, to develop a six-degree-of-freedom (6-DOF) structural response model based on experimental data. This paper represents a portion of the research for the 6-DOF structural imaging project. A method for creating a functionalized description of a discreetly sampled 2-D data field containing response measurements evenly spaced in laser scan angie coordinates is presented. A filtering process involving a median and edge-median filter algorithm followed by a Discrete Fourier Transform/low-pass spatial frequency domain filter/Inverse Discrete Fourier Transform algorithm is used to reduce the effect of errant data recorded by the LDV data acquisition system. A means of evaluating the performance of this process is developed. Finally, an experiment to determine the relationship between structural response stability and ambient temperature and relative humidity is presented. The response of a lightly damped structure was studied over a twenty-six hour period. A direct relationship between temperature and the dynamic response of the structure was found. This study is important to the overall 6-DOF project since structural stability is assumed in merging the various scans of the structure to obtain 6-DOF information. Recommendations are given for further research of topics discussed in this thesis.en
dc.description.degreeMaster of Scienceen
dc.format.extentxv, 143 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-06112009-063931en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-06112009-063931/en
dc.identifier.urihttp://hdl.handle.net/10919/43199en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V855_1993.N466.pdfen
dc.relation.isformatofOCLC# 30443376en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V855 1993.N466en
dc.subject.lcshStructural dynamicsen
dc.subject.lcshStructural stability -- Measurementen
dc.titleA method for the spatial functionalization of the dynamic response of a structure with structural stability considerationsen
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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