新型半主动调谐质量阻尼器减震性能的数值模拟  

Numerical study on seismic performs of a new semi-active tuned mass damper

作　　者：王梁坤 施卫星[1] 周颖[1,2] WANG Liangkun;SHI Weixing;ZHOU Ying(Department of Disaster Mitigation for Structures,Tongji University,Shanghai 200092,China;State Key Laboratory of Disaster Reduction in Civil Engineering,Tongji University,Shanghai 200092,China)

机构地区：[1]同济大学结构防灾减灾工程系,上海200092 [2]同济大学土木工程防灾国家重点实验室,上海200092

出　　处：《地震工程与工程振动》2019年第1期172-179,共8页Earthquake Engineering and Engineering Dynamics

基　　金：国家重点研发计划(2016YFC0701101);国家自然科学基金项目(51678449)~~

摘　　要：为了改良被动式调谐质量阻尼器(TMD)对建筑结构的减震效果,本文提出了一种新型的可实时调节频率和电涡流阻尼的半主动调谐质量阻尼器(SATMD)。由Hilbert-Huang变换(HHT)识别出结构的瞬时频率,通过基于HHT的控制算法实时调节SATMD的质量进行频率的调谐;通过基于线性二次型高斯(LQG)的控制算法实时调整磁导间距来调节电涡流阻尼系数。为了验证SATMD对建筑结构的减震效果,以一单自由度结构模型为例进行地震响应模拟,同时采用一经优化设计的被动TMD作为对比,并考虑由于主结构的累积损伤等引起自身频率下降而造成被动TMD的去谐效应。以主结构的加速度和位移时程峰值、整体均方根值及TMD的耗能性能作为评价指标,对比了SATMD在主结构发生损伤前后对被动TMD的改良效果。数值模拟结果表明,在主结构发生损伤前后,SATMD均比经优化设计的被动TMD有更好的减震效果及耗能能力。In order to improve the effect of traditional tuned mass damper(TMD)under earthquake excitations,a novel TMD named semi-active TMD(SATMD)is proposed,which can retune its frequency and eddy current damping in real time.The structural instantaneous frequency is identified through Hilbert-Huang transformation(HHT),and the mass of SATMD is adjusted through HHT-based control algorithm.The eddy current damping can be adjusted in real time through adjusting the air gap based on the linear-quadratic-Gaussian(LQG)-based control algorithm.In order to verify the vibration control effect of the SATMD,a primary structure equipped with a SATMD excited by earthquake excitations is proposed as a numerical simulation.An optimal passive TMD is used for comparison and the detuning effect is considered,which is caused by the cumulative damage of primary structure.Maximum and root-mean-square(RMS)value of structural acceleration and displacement time history response,and energy dissipation effect of TMD are used as evaluation indexes.The results show that SATMD performs better than the optimized passive TMD both before and after damage occurs to the primary structure.

关 键 词：半主动调谐质量阻尼器 可变频率 可变阻尼 减震效果 耗能能力 

分 类 号：TU352[建筑科学—结构工程] TU31