Passive vibration isolation using axially loaded curved beams

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dc.contributor.authorAbolfathi, Ali
dc.contributor.authorWaters, Tim P.
dc.contributor.authorBrennan, Michael J. [UNESP]
dc.contributor.institutionUniversity of Southampton
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2014-05-27T11:26:19Z
dc.date.available2014-05-27T11:26:19Z
dc.date.issued2011-12-01
dc.description.abstractA nonlinear spring element of a vibration isolator should ideally possess high static and low dynamic stiffness. A buckled beam may be a good candidate to fulfil this requirement provided its internal resonance frequencies are high enough to achieve a wide frequency range of isolation. If a straight beam is used, there is a singularity in the force-displacement characteristic. To smooth this characteristic and eliminate the singularity at the buckling point, beams with initial constant curvature along their length are investigated here as an alternative to the buckled straight beam. Their force displacement characteristics are compared with different initial curvature and with a straight buckled beam. The minimum achievable dynamic stiffness with its corresponding static stiffness is compared for different initial curvatures. A case study is considered where the beams are optimized to isolate a one kilogram mass and to achieve a natural frequency of 1 Hz, considering small amplitudes of vibration. Resonance frequencies of the optimized beams for different curvature are presented. It is shown that an order of magnitude reduction in stiffness compared with a linear spring is achievable, while the internal resonance frequencies of the curved beam are high enough to achieve an acceptable frequency range of isolation.en
dc.description.affiliationDynamics Group Institute of Sound and Vibration Research (ISVR) University of Southampton, Highfield Campus, Southamtpon, SO17 1BJ
dc.description.affiliationDepartamento Do Engenharia Mecãnica Universidade Estadual Paulista, Av. Brasil Centro, 56, 15385-000 Ilha Solteira, Sao Paulo
dc.description.affiliationUnespDepartamento Do Engenharia Mecãnica Universidade Estadual Paulista, Av. Brasil Centro, 56, 15385-000 Ilha Solteira, Sao Paulo
dc.format.extent2960-2967
dc.identifier.citation18th International Congress on Sound and Vibration 2011, ICSV 2011, v. 4, p. 2960-2967.
dc.identifier.scopus2-s2.0-84871521715
dc.identifier.urihttp://hdl.handle.net/11449/73043
dc.language.isoeng
dc.relation.ispartof18th International Congress on Sound and Vibration 2011, ICSV 2011
dc.rights.accessRightsAcesso aberto
dc.sourceScopus
dc.subjectBuckled beams
dc.subjectConstant curvature
dc.subjectCurved beams
dc.subjectDynamic stiffness
dc.subjectForce-displacement characteristics
dc.subjectFrequency ranges
dc.subjectInitial curvature
dc.subjectInternal resonance
dc.subjectLinear spring
dc.subjectMagnitude reduction
dc.subjectNonlinear springs
dc.subjectPassive vibration
dc.subjectResonance frequencies
dc.subjectSmall amplitude
dc.subjectStatic stiffness
dc.subjectVibration isolators
dc.subjectWide frequency range
dc.subjectBuckling
dc.subjectCurved beams and girders
dc.subjectNatural frequencies
dc.subjectOptimization
dc.subjectStiffness
dc.subjectCurve fitting
dc.titlePassive vibration isolation using axially loaded curved beamsen
dc.typeTrabalho apresentado em evento
unesp.campusUniversidade Estadual Paulista (Unesp), Faculdade de Engenharia, Ilha Solteirapt

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