基于结构加速度响应控制时不同激励下MTMD性能的比较研究

COMPARATIVE STUDY ON PERFORMANCE OF ACCELERATION-RESPONSE- CONTROL-BASED MTMD FOR STRUCTURES UNDER VARIOUS EXCITATIONS

基于结构的加速度响应控制 ,导出了四种类型激励下设置MTMD结构的加速度传递函数。于是MTMD的最优参数评价准则可定义为设置MTMD结构最大加速度动力放大系数最小值的最小化。MTMD的有效性评价准则定义为设置MTMD结构最大加速度动力放大系数最小值的最小化与未设置MTMD结构最大加速度动力放大系数之比值。数值结果表明 ,四种激励下MTMD的最优平均阻尼比、鲁棒性和有效性近似相同。然而 。

Based on the structural acceleration response control,the acceleration transfer function is formulated for the structure with MTMD under four types of excitations.The criterion for assessing the optimum parameters of the MTMD may then be defined as the minimization of the minimum values of the maximum acceleration dynamic magnification factors of the structure with MTMD.The assessment criterion of the MTMD effectiveness is defined to be the minimization of the minimum values of the maximum acceleration dynamic magnification factors,normalized with respect to the uncontrolled maximum acceleration dynamic magnification factor.The numerical results indicate that the MTMD for four types of excitations practically possesses the same optimum average damping ratio,robustness,and effectiveness.However,four types of excitations make a great difference in the optimum tuning frequency ratio of the MTMD.