Behavior of a cracked shaft during passage through a critical speed

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dc.contributor.authorAndruet, Raul Horacioen
dc.contributor.committeechairPlaut, Raymond H.en
dc.contributor.committeememberRojiani, Kamal B.en
dc.contributor.committeememberHolzer, Siegfried M.en
dc.contributor.departmentCivil Engineeringen
dc.date.accessioned2014-03-14T21:50:31Zen
dc.date.adate2009-11-24en
dc.date.available2014-03-14T21:50:31Zen
dc.date.issued1991-08-15en
dc.date.rdate2009-11-24en
dc.date.sdate2009-11-24en
dc.description.abstractThe detection of cracks in structural components and the evaluation of their sizes without the need of removing them from the machine in which they are placed is very important for preventing failures. The objective of this thesis is to study the effects of cracks on the dynamic behavior of shafts under acceleration or deceleration, in order to find methods or procedures capable of detecting the presence of cracks prior to failure. The equations of motion for a simply supported Bernoulli-Euler shaft are developed following Wauer's formulation. Galerkin's Method is used to obtain five-term approximate solutions. The first two natural frequencies are found for both the uncracked and cracked shaft. A computer program is written to perform the numerical integration of the equations. The shaft is subjected to several constant accelerations and decelerations. Tables and figures showing the results are presented along with discussions and comments related to the different runs made and the results obtained. The effect of the initial position angle of the eccentricity is studied to find the influence of this parameter. The effects of crack position and crack depth on the dynamic behavior of the shaft are also included in this work. Time histories and summary graphs are presented to make easier the interpretation of the results. Final conclusions and future research proposals complete the work done in this thesis.en
dc.description.degreeMaster of Scienceen
dc.format.extentxiii, 146 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-11242009-020021en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-11242009-020021/en
dc.identifier.urihttp://hdl.handle.net/10919/45985en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V855_1991.A647.pdfen
dc.relation.isformatofOCLC# 24956712en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V855 1991.A647en
dc.subject.lcshCranks and crankshaftsen
dc.subject.lcshShafting -- Dynamicsen
dc.titleBehavior of a cracked shaft during passage through a critical speeden
dc.typeThesisen
dc.type.dcmitypeTexten
thesis.degree.disciplineCivil Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen
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