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dc.contributor.authorLangdon, Justin Daviden_US
dc.date.accessioned2014-03-14T20:31:45Z
dc.date.available2014-03-14T20:31:45Z
dc.date.issued2007-01-31en_US
dc.identifier.otheretd-02132007-112050en_US
dc.identifier.urihttp://hdl.handle.net/10919/31224
dc.description.abstractThe purpose of this study has two parts directed toward a common goal. First, a state-ofthe-art quarter-car test platform has been designed and constructed to offer increased testing flexibility at a reasonable cost not found commercially. With this new test rig completed, the second objective is a proof-of-concept evaluation of a well known adaptive control algorithm applied to this new quarter-car test rig for the purpose of replicating the dynamic suspension response, such as a response that was recorded during a road test. A successful application of this control algorithm on the quarter-car rig is the necessary first step toward its application on an 8-post test rig for a direct comparison to current practices. Before developing a new test rig, the current state-of-the-art in quarter-car rigs was first evaluated as well as indoor vehicle testing in general. Based on these findings, a list of desired functional requirements was defined for this new design to achieve. The new test rig was built and evaluated to determine how these goals were met and what the next steps would be to improve the rig. The study then focused on evaluating control policies used for reproducing dynamic responses on vehicle road simulators such as 4- post and 7-post shaker rigs. A least-mean squares (LMS) adaptive algorithm is introduced and applied first in software using a linear two-mass quarter-car model, and then to the actual hardware-in-the-loop quarter-car rig. The results of the study show that the resulting quarter-car test rig design is quite flexible in its ability to test a multitude of suspension designs and also its ability to accommodate new hardware in the future such as a body loaders. The study confirms that this particular implementation of the LMS algorithm is a viable option for replicating test vehicle response on an indoor quarter-car test rig. Thus, a future study to compare the use of this algorithm to the current industry standard batch processing method is possible.en_US
dc.publisherVirginia Techen_US
dc.relation.haspartLangdon_Thesis_Rev_Final_ETD_2007.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.subjectvehicle response replicationen_US
dc.subjectsuspensionen_US
dc.subjectsystem identificationen_US
dc.subjectadaptive inverse controlen_US
dc.subjecttest rigen_US
dc.subjectquarter-caren_US
dc.titleDesign and Adaptive Control of a Lab-based, Tire-coupled, Quarter-car Suspension Test Rig for the Accurate Re-creation of Vehicle Responseen_US
dc.typeThesisen_US
dc.contributor.departmentMechanical Engineeringen_US
thesis.degree.nameMaster of Scienceen_US
thesis.degree.levelmastersen_US
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen_US
dc.contributor.committeechairSouthward, Steve C.en_US
dc.contributor.committeememberFerris, John B.en_US
dc.contributor.committeememberSandu, Corinaen_US
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-02132007-112050/en_US
dc.date.sdate2007-02-13en_US
dc.date.rdate2007-05-16
dc.date.adate2007-05-16en_US


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