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    題名: Effects of a Dynamic Vibration Absorber on Nonlinear Hinged-Free Beam
    作者: Yi-Ren Wang;Ting-Hung Kuo
    關鍵詞: Nonlinear vibration;Beam vibration;Internal resonance;Vibration absorber
    日期: 2016-01-06
    上傳時間: 2016-04-22 13:45:31 (UTC+8)
    出版者: American Society of Civil Engineers
    摘要: This study examined the vibrations of a hinged-free nonlinear beam placed on a nonlinear elastic foundation. The authors found
    that specific combinations of an elastic modulus in the elastic foundation resulted in 1:3 internal resonances in the first and second modes of
    the beam. This prompted adding a dynamic vibration absorber (DVA) on the elastic beam in order to prevent internal resonance and suppress
    vibrations. When the DVA was placed at the free end of the beam, the boundaries were time dependent. Thus, a shifting polynomial function
    was used to convert the nonhomogeneous boundary conditions into homogeneous boundary conditions. The authors analyzed this nonlinear
    system using the method of multiple scales (MOMS). Fixed-point plots were also used to facilitate the observation of internal resonance. This
    made it possible to study the influence of nonlinear geometry and nonlinear inertia associated with the vibration of the elastic beam.
    The authors also examined the combination of optimal mass ratio and elastic modulus for the DVA in order to prevent internal resonance
    and achieve optimal damping effects. In the nonlinear beam investigated in this study, the placement of a DVA between 0.25l and 0.5l from
    the hinged end of the beam proved the most effective for damping; locations between 0.7l and 0.8l on the beam were ineffective. Finally,
    numerical methods and simple experiments were studied to compare the results from MOMS and demonstrate the effects of the DVA of this
    model.
    關聯: Journal of Engineering Mechanics 142(4), 04016003(25pages)
    DOI: 10.1061/(ASCE)EM.1943-7889.0001039
    顯示於類別:[航空太空工程學系暨研究所] 期刊論文

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