Estimating Uncertainties in the Joint Reaction Forces of Construction Machinery

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dc.contributor.authorAllen, James Brandonen
dc.contributor.committeechairSandu, Corinaen
dc.contributor.committeememberAhmadian, Mehdien
dc.contributor.committeememberWicks, Alfred L.en
dc.contributor.departmentMechanical Engineeringen
dc.date.accessioned2014-03-14T20:37:47Zen
dc.date.adate2009-06-05en
dc.date.available2014-03-14T20:37:47Zen
dc.date.issued2009-05-11en
dc.date.rdate2012-04-24en
dc.date.sdate2009-05-20en
dc.description.abstractIn this study we investigate the propagation of uncertainties in the input forces through a mechanical system. The system of interest was a wheel loader, but the methodology developed can be applied to any multibody systems. The modeling technique implemented focused on efficiently modeling stochastic systems for which the equations of motion are not available. The analysis targeted the reaction forces in joints of interest. The modeling approach developed in this thesis builds a foundation for determining the uncertainties in a Caterpillar 980G II wheel loader. The study begins with constructing a simple multibody deterministic system. This simple mechanism is modeled using differential algebraic equations in Matlab. Next, the model is compared with the CAD model constructed in ProMechanica. The stochastic model of the simple mechanism is then developed using a Monte Carlo approach and a Linear/Quadratic transformation method. The Collocation Method was developed for the simple case study for both Matlab and ProMechanica models. Thus, after the Collocation Method was validated on the simple case study, the method was applied to the full 980G II wheel loader in the CAD model in ProMechanica. This study developed and implemented an efficient computational method to propagate computational method to propagate uncertainties through "black-box" models of mechanical systems. The method was also proved to be reliable and easier to implement than traditional methods.en
dc.description.degreeMaster of Scienceen
dc.identifier.otheretd-05202009-172358en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-05202009-172358/en
dc.identifier.urihttp://hdl.handle.net/10919/33046en
dc.publisherVirginia Techen
dc.relation.haspartJamesMastersThesisMay20.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectCaterpillar 980G Series II wheel loaderen
dc.subjectpolynomial chaos collocationen
dc.subjectstochastic rigid body modelingen
dc.subjectNewtonian projection methoden
dc.titleEstimating Uncertainties in the Joint Reaction Forces of Construction Machineryen
dc.typeThesisen
thesis.degree.disciplineMechanical Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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