可控式TMD-混合水箱系统减振控制策略

Vibration Reduction Strategies of Controllable TMD-Hybrid Tanks System

工程振动或计算、施工误差使结构的固有频率发生偏移或使实际的固有频率与设计值出现偏差,导致被动调谐类阻尼器减振效果明显下降.为了改善调谐阻尼器的这种失谐效应,提出了可控式TMD-混合水箱系统(controllable TMD-hybrid tanks system,简称CTHTS)的概念,通过改变系统中挡板的开合状态,以应对结构频率发生偏移.阐述了该系统中各参数的设置方法,导出了调谐液柱阻尼器(TLCD)、调谐液体阻尼器(TLD)以及结构-混合系统(THTS)的运动方程,并通过算例中CTHTS与普通TMD对结构减振效果的比较,证明了CTHTS的优越性和减振策略的有效性.

Excursions of structures＇ frequencies, result from engineering vibration or discrepancies between structures＇ actual frequencies and designed ones due to calculation or construction errors, will make the vibration reduction effect of a passive tuned damper drop obviously. In order to improve the detuning effect of a passive tuned damper, a controllable TMD-hybrid tanks system （CTHTS） was proposed. Horizontal baffles in this system are switched to deal with the frequency excursion of a structure. The setting of parameters in the system was discussed, and the motion equations for TLCD （tuned liquid column damper）, TLD （tuned liquid damper） and a structure with THTS （TMD-hybfid tanks system） are derived. A numerical example was used to compare the control performance of CTHTS and ordinary TMD （tuned mass damper）. The research results show the advantage of the CTHTS and the effectiveness of the strategies.