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dc.contributor.authorLiam, Christopher Charlesen_US
dc.date.accessioned2014-03-14T20:37:14Z
dc.date.available2014-03-14T20:37:14Z
dc.date.issued2011-05-06en_US
dc.identifier.otheretd-05162011-104944en_US
dc.identifier.urihttp://hdl.handle.net/10919/32874
dc.description.abstractThis study conducted a series of tests on a shock mitigating seat designed for high speed craft using various input excitations to better understand the relationship between various seat and operational conditions, and the response of the seat. A seat model of the test seat is used for a parametric study of various spring, damping and operational configurations. A seat shake rig is implemented to simulate motions of multiple high-speed craft as well as various defined inputs. At each test input the occupant weight and suspension preload is varied and the response is analyzed to find changes in acceleration, which is representative of the changes in force and displacement. By representing the seat as a based-excitation two-degree-of-freedom system, we develop the equations of motion and model them in Simulink to analyze the effects of various spring rates and damping coefficients. Based on the results it is found that an increase in occupant mass results in a decrease in observed acceleration. Increasing suspension preload is found to be detrimental to the mitigating abilities of the seat, changing the dynamics to those similar of a rigid-mounted seat. An analysis of the defined inputs resulted in confirming various seat characteristics. The analysis of the Simulink model revealed that increasing the spring rate results in an increase in acceleration. An increase in damping coefficient resulted in an increase in acceleration and ride harshness.en_US
dc.publisherVirginia Techen_US
dc.relation.haspartLIAM_CC_T_2011.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.subjecthigh speed craften_US
dc.subjectshock mitigating seatsen_US
dc.titleTesting and Modeling of Shock Mitigating Seats for High Speed Craften_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.committeechairAhmadian, Mehdien_US
dc.contributor.committeememberInman, Daniel J.en_US
dc.contributor.committeememberTaheri, Saieden_US
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-05162011-104944/en_US
dc.date.sdate2011-05-16en_US
dc.date.rdate2011-05-18
dc.date.adate2011-05-18en_US


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