「運動と振動の制御」シンポジウム講演論文集
Online ISSN : 2424-3000
セッションID: D18
会議情報
D18 調和的な可変減衰を用いたセミアクティブ振動制御 : 免震層構造物への適応(M-OS2-3 セミアクティブ制御,M-OS2 建築・建設構造物の耐震・免震・制振,「海を越え,国を越え,世代を超えて!」)
広畑 賢射場 大輔本宮 潤一中村 守正森脇 一郎
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This paper demonstrates effects of harmonically varying damping on a structure with an isolation layer. We applied the method of harmonically varying damping to vibration mitigation of a single-degree-of-freedom structure with sinusoidal base excitation having two frequencies. In the study, an ideal variable damper was used in conjunction with the secondary sinusoidal base excitation to reduce the response due to the primary base excitation. When the primary sinusoidal base excitation contains a natural frequency of the system, a resonance is induced. However, another resonance can be generated by the modulated component caused by the variable damping device and the secondary base excitation. The additional resonance was adjusted to be out of phase with the primary response, and the response of the structure was effectively reduced as a result of the damping. However, no such study considering multi-degree-of-freedom systems have been conducted. This paper presents the effect of harmonically varying damping on the multi-degree-of-freedom systems, especially; the influence on a structure with an isolation layer is discussed. The new proposed semi-active control laws require the phase information of the structural vibrations. However, obtaining the phases of the vibrations would be difficult if the vibrations were complex. Therefore, in this study, the Stuart-Landau Oscillator filter is used for estimation of the phase information from the response of structure. The filter is taken advantage of the synchronization properties of a nonlinear oscillator, and the output of the oscillator has the characteristic frequency designated by the oscillator. The validity of the proposed system is shown by numerical simulation.
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