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基于磁流变弹性体的调频TMD减振装置

DOI: 10.13197/j.eeev.2015.05.29.tujw.005, PP. 29-34

Keywords: 调频TMD,磁流变弹性体,频率识别,HHT变换,振动控制,刚度退化

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Abstract:

调谐质量阻尼器(TMD)只有在TMD的固有频率与主结构自振频率一致时,才会取得良好的减振效果。而工程结构在长期使用过程中,由于刚度退化、活荷载经常变化等原因,主结构的自振频率会发生改变,大大降低了传统TMD的减振效果。为了克服上述不足,结合磁流变弹性体刚度可调的智能特性,本文提出了基于磁流变弹性体的调频TMD装置。采用HHT变换和自然激励法相结合的方法识别主结构的固有频率,之后根据识别的频率,改变磁流变弹性体的剪切模量,使得调频TMD的频率可以实时跟踪主结构的固有频率。最后对某环形步道的竖向振动响应进行了仿真分析,结果表明调频TMD克服了传统TMD的不足,可以在较宽的频率范围内取得良好的减振效果。

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