双调谐液体柱形阻尼器及其基本动力性能

Fundamental Dynamic Characteristics of Double Tuned Liquid Column Damper for Suppressing Harmonically Forced Oscillations

借鉴被动调谐质量阻尼器(tuned mass damper,简称TMD)和调谐液体柱形阻尼器(tuned liquid column damper,简称TLCD)各自的优缺点,结合土木工程结构减震装置的经济性和适用性,提出了一种双调谐液体柱形阻尼器(doubly tuned liquid column damper,简称DTLCD),建立了简谐激励作用下单自由度DTLCD控制体系(DTLCD-SDOF)的运动方程,推导了其动力反应放大系数。提出了针对DTLCD的调优策略及优化评价函数,通过相关算法获得DTLCD-SDOF系统的参数优化程序,并利用该程序得到了DTLCD的最优参数。具体分析了不同参数对DTLCD共振峰值和调频宽度的影响,并对阻尼器阻尼参数或受控结构频率发生变化后DTLCD的鲁棒性进行了评价。对DTLCD,TMD,TLCD及DTMD的有效性和鲁棒性进行了对比分析。理论与数值研究结果表明,DTLCD的控制效果明显优于TMD和TLCD,与DTMD效果相同,并且在主结构频率的摄动方面拥有更佳的鲁棒性。事实证明,DTMD比TMD和TLCD更具工程适用性。

Taking the advantages of tuned mass damper (TMD) and tuned liquid column dampers (TLCD) in civil engineering vibration control, a double tuned liquid column damper (DTLCD) was presented considering the cost and efficiency of vibration attenuation used in civil engineering. The motion equation of the DTLCD-single-degree-of-freedom (DTLCD-SDOF) system under harmonic excitation was established, of which the dynamic magnification factor (DMF) was derived. Then, an optimization strategy and evaluation function was proposed to judge the parameters of DTLCD, and a parameter optimization program written in Matlab was used to optimize DTLCD. Effects of each parameter on dynamic magnification factor (DMF) were discussed, as well as the robustness of DTLCD when the damping ratio and frequency were changed. Finally, the effectiveness and robustness of DTLCD was compared with that of the TMD, TLCD and DTMD. The theoretical and numerical results showed that the effectiveness of DTLCD was much better than of the TMD and TLCD, and was the same as that of DTMD; meanwhile, DTLCD had the best robustness in terms of perturbation of structure frequency. It was concluded that DTLCD is a very effective method of vibration control. © 2016, Editorial Department of JVMD. All right reserved.