A Multibody Dynamics Approach to the Modeling of Friction Wedge Elements for Frieght Train Suspensions

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dc.contributor.authorSteets, Jennifer Mariaen
dc.contributor.committeechairSandu, Corinaen
dc.contributor.committeecochairAhmadian, Mehdien
dc.contributor.committeememberSouthward, Steve C.en
dc.contributor.departmentMechanical Engineeringen
dc.date.accessioned2014-03-14T21:36:35Zen
dc.date.adate2007-06-07en
dc.date.available2014-03-14T21:36:35Zen
dc.date.issued2007-05-09en
dc.date.rdate2007-06-07en
dc.date.sdate2007-05-24en
dc.description.abstractThis thesis presents a theoretical application of multibody dynamics with unilateral contact to model the interaction of the damping element in a freight train suspension, the friction wedge, with the bolster and the side frame. The objective of the proposed approach is to produce a stand-alone model that can better characterize the interaction between the bolster, the friction wedge, and the side frame subsystems. The new model allows the wedge four degrees of freedom: vertical displacement, longitudinal (between the bolster and the side frame) displacement, pitch (rotation about the lateral axis), and yaw (rotation about the vertical axis). The new model also allows for toe variation. The stand-alone model shows the capability of capturing dynamics of the wedge which were not possible to simulate using previous models. The inclusion of unilateral contact conditions is integral in quantifying the behavior during lift-off and the stick-slip phenomena. The resulting friction wedge model is a 3D, dynamic, stand-alone model of a bolster-friction wedge-side frame assembly. The new stand-alone model was validated through simulation using simple inputs. The dedicated train modeling software NUCARS® has been used to run simulations with similar inputs and to compare — when possible — the results with those obtained from the new stand-alone MATLAB friction wedge model. The stand-alone model shows improvement in capturing the transient dynamics of the wedge better. Also, it can predict not only normal forces going into the side frame and bolster, but also the associated moments. Significant simulation results are presented and the main differences between the current NUCARS® models and the new stand-alone MATLAB models are highlighted.en
dc.description.degreeMaster of Scienceen
dc.identifier.otheretd-05242007-171207en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-05242007-171207/en
dc.identifier.urihttp://hdl.handle.net/10919/42788en
dc.publisherVirginia Techen
dc.relation.haspartthesis_3_etd_coments.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectunilateral contacten
dc.subjecttrain cab suspensionen
dc.subjectbolsteren
dc.subjectside frameen
dc.subjectfreight trainen
dc.subjectmultibody dynamicsen
dc.subjectfriction wedgeen
dc.subjectBogieen
dc.titleA Multibody Dynamics Approach to the Modeling of Friction Wedge Elements for Frieght Train Suspensionsen
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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