环形调液阻尼器振动控制中拍的研究

The beat phenomenon in structural vibration control using circular tuned liquid column dampers

对环形调液阻尼器减振控制中的拍现象进行研究,分析了环形调液阻尼器对结构纯扭转振动控制中的拍现象,分别考虑无阻尼结构体系、主体结构有阻尼而CTLCD无阻尼的体系及主体结构和CTLCD中均有阻尼的体系,从数学角度对拍现象发生的机理进行解释。研究结构表明,当拍现象发生时,主体结构的振动不仅不会受到抑制,有时反而会加强;当环形调液阻尼器的阻尼增大到一定程度时,拍现象会消失;对于受廹振动,发生拍现象时,由于结构反应的瞬态部分不能得到迅速衰减,结构的瞬态响应将会占结构响应的很大一部分,如果仅考虑结构的稳态响应会带来较大的误差。

This paper focuses on a better understanding of the beat phenomenon that maybe observed in the structural vibration control system using Circular Tuned Liquid Column Damper（CTLCD）.The undamped control system,linearly damped structure with undamped CTLCD and damped control system are analyzed respectively to understand the beat phenomenon from a mathematical point of view.The results show that the response of the main structure cannot be suppressed with the appearance of beat phenomenon and even be magnified.The beat phenomenon on the free vibration of a structure can be disappeared for CTLCD with higher damping.The transient response of the structure can not be degraded promptly when beat phenomenon appears for forced vibration,so there would exist great errors if only the stead response of a structure is considered.