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8-2Šª
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1990”N
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1917-1922•Å
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PROCEEDINGS OF THE JAPAN EARTHQUAKE ENGINEERING SYMPOSIUM
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Yoshikazu YAMADA, Hirokazu IEMURA, Kazuyuki IZUNO, Yoshihisa IWASAKI, Satoru OHNO
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PHASE-DELAYED ACTIVE CONTROL OF STRUCTURES WITH IDENTIFICATION OF RANDOM EARTHQUAKE GROUND MOTION
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Phase-delayed active control of structures under stochastic base excitation is investigated. The synthesis of an active control system discussed in this study is based on stochastic control theory in which an energy-based stochastic criterion is employed for optimal control. Accordingly, an optimal control law for input with a predominant frequency is developed which consists of a response feedback portion and a ground-input feedforward portion even when the dynamic properties of the ground are not known. The effectiveness of the phase-delayed active control law including identification of ground motion is demonstrated with a numerical simulation, which shows that the proposed control law brings considerable control force (RMS) reduction compared with the feedback control for the same level of response reduction in both cases.
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