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工程力学  2015 

基于可变摩擦阻尼力的斜拉索半主动控制算法

DOI: 10.6052/j.issn.1000-4750.2014.04.0336, PP. 94-99

Keywords: 拉索减振,阻尼器,摩擦阻尼力,半主动控制算法,数值分析

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Abstract:

通过比较线性粘滞阻尼器和摩擦型阻尼器的耗能,发现斜拉索采用摩擦型阻尼器获得的最大附加阻尼高于相应的线性粘滞阻尼器,进而提出了基于可变摩擦阻尼力的斜拉索半主动控制算法。该算法通过控制阻尼器位置处的拉索位移振幅来实时调节阻尼力,使其始终满足拉索-阻尼器系统的最优阻尼力幅值与最优阻尼器位移幅值的对应关系。按摩擦型阻尼器的方式耗能,系统获得的最大附加阻尼总是高于线性粘滞阻尼器的被动最优控制,且与振动频率无关,可以实现斜拉索的变频率多模态振动控制。最后,分别针对斜拉索的自由振动和简谐强迫振动进行了半主动控制算法的数值模拟,验证了其减振效果。

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