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朱保兵
（上海建筑設(shè)計(jì)研究院有限公司，上海200041）

[摘要] 拉索結(jié)構(gòu)系統(tǒng)在外部激勵(lì)下作用下將產(chǎn)生低頻諧振，會(huì)導(dǎo)致大的振幅而可能有破壞性事故發(fā)生，故需要一種有效的方法控制這種振動(dòng)。而在拉索的錨座處沿拉索軸向?qū)嵤┲鲃?dòng)控制卻是一種很好的方法。本文在考慮拉索抗彎剛度的基礎(chǔ)上，建立了拉索振動(dòng)主動(dòng)控制模型。通過(guò)線性二次型最優(yōu)控制(LQR)策略對(duì)拉索振動(dòng)實(shí)施了主動(dòng)控制仿真計(jì)算，分析了抗彎剛度對(duì)拉索振動(dòng)主動(dòng)控制的影響，使該控制方法更適合在工程實(shí)際中應(yīng)用。
[關(guān)鍵詞] 拉索；低頻諧振；抗彎剛度；主動(dòng)控制

Effect of cables bending stiffness on active vibration control
Zhu Baobing
(Shanghai Institute of Architectural Design and Research Co., Ltd., Shanghai 200041, China)

Abstract: Large amplitudes of cables can be induced by low order frequency harmonic oscillations. Then, some destructive accidents will happen, and some efficient control methods will be needed. Axial active control at the boundary, i.e., cables anchorage, is an attractive approach. Considering the bending stiffness of cables, active vibration control model ofcables is given. Based on linear quadratic optimal control strategy, active vibration control ofcables is simulated. Effect of cables bending stiffness on active vibration controlis analyzed.Therefore,the control method can be better used in future practice.
Keywords: cables; low order frequency harmonic oscillations; bending stiffness; active control