调谐液体阻尼器对多层多模态平台结构的运动控制研究

Motion control of a multi-layer multi-modal platform structure with a tuned liquid damper

基于双向流固耦合理论,建立了调谐液体阻尼器(tuned liquid damper,TLD)与多层多模态平台结构的数值模型,系统性研究TLD减振频率和安装高度对多层结构前两阶共振模态的影响,通过数值方法将阻尼力做功定量化,结合晃荡波、平台运动的相位延滞关系,分析TLD对多层多模态平台结构的阻尼特性。研究表明,TLD不同安装位置的控制效果与结构对应模态的最大振型相关,晃荡过程中产生的倍频激励可拓宽TLD的减振频带。此外,保持2%的质量比不变,多TLD联合减振系统对多层结构的减振效果更为稳定,无局部负面激励,两个共振点处的平均减振率均高于其他方案。

Based on the two-way fluid structure coupling theory,the numerical model of a tuned liquid damper(TLD)and a multi-layer multi-modal platform structure was established.The effects of the TLD damping frequency and installation height on the first two resonant modes of the multi-layer structure were systematically studied.The damping force was quantified by numerical method.Combinedly considering the phase delay relationship between the sloshing wave and platform motion,the damping characteristics of the TLD on the multi-layer multi-modal platform structure were analyzed.The results show that the control effect of the TLD at different installation position is related to the maximum vibration modal shape of the corresponding mode of the structure.The damping frequency band of TLD can be widened under the excitation of the double frequency component generated in the sloshing process.In addition,keeping the mass ratio of 2%unchanged,the multi-TLD system has a more stable vibration reduction effect on the multi-layer structure without any local negative excitation effect.The average vibration reduction ratios at the two resonance points are better than those of other schemes.