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dc.contributor.authorHeilmann, Johnen_US
dc.date.accessioned2014-03-14T21:45:59Z
dc.date.available2014-03-14T21:45:59Z
dc.date.issued1996-08-05en_US
dc.identifier.otheretd-09182008-063315en_US
dc.identifier.urihttp://hdl.handle.net/10919/44808
dc.description.abstract

Traditional dynamic vibration absorbers (DVAs) consist of a mass-spring-damper system and are an effective means of attenuating structural vibration over a narrow frequency band. The effective bandwidth of the DVA can be increased by the addition of an externally controlled force, generally applied between the reaction-mass and the primary structure. Such devices are known as hybrid DVAs. This thesis presents a new hybrid DVA configuration which utilizes two reaction-masses in parallel. On this proposed hybrid dual-mass (DM) DVA, the control force is applied between the reaction-masses. It is shown that in broadband control applications, the proposed DM-DVA requires less control force to achieve the same primary attenuation as the traditional hybrid single-mass (SM) DVA. The hybrid DM-DVA was compared to the hybrid SM-DVA with two tests. A numerical simulation of the hybrid DVAs attenuating a single-degree-of-freedom structure was performed. To achieve an equal amount of primary attenuation, the hybrid SM-DVA required 65% higher root-mean-square (RMS) control effort than the hybrid DV-DVA. The numerical model also demonstrated that the hybrid DM-DVA was less sensitive to changes in the system as compared to the hybrid SM-DVA. Additionally, a prototype hybrid DVA was built which could be configured as either the hybrid SM or DM-DVA. The prototype hybrid DVA was used with the feedforward Filtered-X LMS algorithm to control the vibration of a fixed-free beam. The hybrid SM and DM-DVAs attenuated the primary response by a factor of 11.5 and 12.3, while requiring control efforts of 4.9 and 2.7 V/N RMS, respectively. Thus, the hybrid DM-DVA required 45% less control effort while yielding a higher attenuation ratio in this experiment. These results demonstrate the superior performance of the proposed DM-DVA for broadband control applications as compared to the traditional SM-DVA.

en_US
dc.format.mediumBTDen_US
dc.publisherVirginia Techen_US
dc.relation.haspartLD5655.V855_1996.H455.pdfen_US
dc.subjectvibration controlen_US
dc.subjectdynamic vibration absorberen_US
dc.subjectactive/passive controlen_US
dc.subject.lccLD5655.V855 1996.H455en_US
dc.titleA dual reaction-mass dynamic vibration absorber for active vibration controlen_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.committeechairBurdisso, Ricardo A.en_US
dc.contributor.committeechairCudney, Harley H.en_US
dc.contributor.committeememberHendricks, Scott L.en_US
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-09182008-063315/en_US
dc.date.sdate2008-09-18en_US
dc.date.rdate2008-09-18
dc.date.adate2008-09-18en_US


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