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dc.contributor.authorBallew, Brent Stevenen_US
dc.date.accessioned2014-03-14T20:36:39Z
dc.date.available2014-03-14T20:36:39Z
dc.date.issued2008-04-28en_US
dc.identifier.otheretd-05132008-202826en_US
dc.identifier.urihttp://hdl.handle.net/10919/32707
dc.description.abstractPrevious work in the Railway Technology Laboratory at Virginia Tech focused on better capturing the dynamics of the friction wedge, modeled as a 3D rigid body. The current study extends that work to a half-truck model treated as an application of multibody dynamics with unilateral contact to model the friction wedge interactions with the bolster and the sideframe. The half-truck model created in MATLAB is a 3D, dynamic, multibody dynamics model comprised of four rigid bodies: a bolster, two friction wedges, and a sideframe assembly. The model allows each wedge four degrees of freedom: vertical displacement, longitudinal displacement (between the bolster and sideframe), pitch (rotation around the lateral axis), and yaw (rotation around the vertical axis). The bolster and the sideframe have only the vertical degree of freedom. The geometry of these bodies can be adjusted for various simulation scenarios. The bolster can be initialized with a pre-defined yaw (rotation around the vertical axis) and the sideframe may be initialized with a pre-defined pitch/toe (rotation around the lateral axis). The multibody dynamics half-truck model simulation results have been compared with results from NUCARS®, an industry standard train modeling software, for similar inputs. The multibody dynamics models have also been extended to a variably damped full-truck model and a variably damped half-truck warping model. These models were reformulated to react dynamically to simulated truck warp inputs. The ability to better characterize truck warping properties can prevent train roll over and derailments from truck hunting. In a quarter-truck variably damped configuration the effects of a curved wedge surface has also been explored. Actual friction wedges have surfaces which are slightly curved, this iteration in the multibody dynamics friction wedge modeling attempts to draw one step closer to actual friction wedge geometry. This model lays the ground work for a contact dependant wedge wearing model based on material properties and tribology.en_US
dc.publisherVirginia Techen_US
dc.relation.haspartBrentBallewThesis.pdfen_US
dc.rightsI hereby certify that, if appropriate, I have obtained and attached hereto a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee. I hereby grant to Virginia Tech or its agents the non-exclusive license to archive and make accessible, under the conditions specified below, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report.en_US
dc.subjecttrain cab suspensionen_US
dc.subjectunilateral contacten_US
dc.subjectmultibody dynamicsen_US
dc.subjectfriction wedgeen_US
dc.subjectBogieen_US
dc.subjectbolsteren_US
dc.subjectside frameen_US
dc.subjectfreight trainen_US
dc.titleAdvanced Multibody Dynamics Modeling of the Freight Train Truck Systemen_US
dc.typeThesisen_US
dc.contributor.departmentMechanical Engineeringen_US
dc.description.degreeMaster of Scienceen_US
thesis.degree.nameMaster of Scienceen_US
thesis.degree.levelmastersen_US
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen_US
thesis.degree.disciplineMechanical Engineeringen_US
dc.contributor.committeechairSandu, Corinaen_US
dc.contributor.committeememberHong, Dennis W.en_US
dc.contributor.committeememberAhmadian, Mehdien_US
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-05132008-202826/en_US
dc.date.sdate2008-05-13en_US
dc.date.rdate2008-06-05
dc.date.adate2008-06-05en_US


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