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Development of a statistical method for validating ESDM strain-field output

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dc.contributor.authorDoktor, Christopher A.en
dc.contributor.committeechairWest, Robert L. Jr.en
dc.contributor.committeememberMitchell, Larry D.en
dc.contributor.committeememberWicks, Alfred L.en
dc.contributor.departmentMechanical Engineeringen
dc.date.accessioned2014-03-14T21:27:40Zen
dc.date.adate2009-01-24en
dc.date.available2014-03-14T21:27:40Zen
dc.date.issued1995-12-05en
dc.date.rdate2009-01-24en
dc.date.sdate2009-01-24en
dc.description.abstractThis thesis addresses the problem of developing a statistical method for validating the ESDM strain-field output. Specifically, it addresses the problems of estimating the ESDM strain-field uncertainty, choosing an appropriate standard measurement, estimating the uncertainty in the standard measurement, and comparing the ESDM strain-fields against a finite set of standard measurements. A solution to each of these problems is presented. Specifically, it is shown that 1) the uncertainty in the strain-field may be estimated from the ESDM dynamic stiffness matrix; 2) strain gages are chosen to validate the ESDM strain-fields; 3) the uncertainty of the strain gage measurements may be estimated from the uncertainty in the system calibration, the output voltage of the system and the tolerance of the strain gage gage factor; and 4) the ESDM strain-fields may be validated against a set of strain gage measurements by a combining a 2-group z-test (hypothesis test on two means with known variances) with a qualitative analysis of the field. This statistical validation method is then evaluated in test-based simulation to determine if it provides reliable assessments of the ESDM strain-field accuracy. The results of the simulation show that the validation method does, indeed, provide reliable assessment of the ESDM strain-field accuracy. The results also show that the ESDM method should be capable of accurately estimating dynamic strain-fields, provided it is not subjected to substantial error in the calculated position and orientation of the laser or nonstationary behavior in the structure.en
dc.description.degreeMaster of Scienceen
dc.format.extentxix, 208 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-01242009-063032en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-01242009-063032/en
dc.identifier.urihttp://hdl.handle.net/10919/40726en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V855_1995.D653.pdfen
dc.relation.isformatofOCLC# 34619237en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectstatisticsen
dc.subject.lccLD5655.V855 1995.D653en
dc.titleDevelopment of a statistical method for validating ESDM strain-field outputen
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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