利用耦合系统自由振动响应识别结构被控模态和TMD参数  

Parameter identification of controlled structural mode and TMD based on the free vibration tests of the coupled system

作　　者：温青 华旭刚[2] 王修勇[1] 陈政清 孙洪鑫[1] 曹张 WEN Qing;HUA Xu-gang;WANG Xtu-yong;CHEN Zheng-qing;SUN Hong-xin;CAO Zhang(Hunan Provincial Key Laboratory of Structures for Wind Resistance and Vibration Control, School of Civil Engineering,Hunan University of Science and Technology,Xiangtan 411201,China;Key Laboratory for Wind and Bridge Engineering of Hunan Province,Hunan University,Changsha 410082,China)

机构地区：[1]湖南科技大学土木工程学院结构抗风与振动控制湖南省重点实验室,湖南湘潭411201 [2]湖南大学风工程与桥梁工程湖南省重点实验室,湖南长沙410028

出　　处：《振动工程学报》2019年第4期565-573,共9页Journal of Vibration Engineering

基　　金：国家重点基础研究发展计划(973计划)项目(2015CB057702);国家自然科学基金资助项目(51708208)

摘　　要：准确从安装TMD后的结构-TMD耦合系统中识别结构被控模态和TMD参数是TMD现场调试的必需条件.针对TMD现场调试中参数识别问题,提出了一种通过结构-TMD耦合系统自由振动试验识别结构被控模态的模态质量、频率和阻尼比以及TMD频率和阻尼比的方法.该方法首先采用随机子空间算法评估耦合系统的离散状态空间模型,然后将其减缩和转化为结构被控模态和TMD耦合的两自由系统连续状态空间模型;最后,利用连续状态矩阵,识别结构被控模态的模态质量、频率和阻尼比以及TMD频率和阻尼比.数值分析研究结果表明:1)该方法抗噪能力强;2)TMD与原结构各模态耦合越强,质量比识别结果误差越大,其他参数识别结果均满足工程要求.通过单层框架结构试验研究,验证了该方法的可行性.Accurate identification of the structural modal parameters and TMD physical parameters based on the vibration tests of the structure-TMD coupled system is necessary for in-situ TMD tuning. In this paper,a method is proposed to identify mo-dal mass,frequency and damping ratio for the structural controlled mode and frequency and damping ratio of TMD from the free vibration tests of the structure-TMD coupled system.The flowchart of the proposed method is as follows: first,the dis-crete state matrix is estimated by stochastic subspace identification;then,a reduced two degrees-of freedom state space model of structural controlled mode and TMD coupled system is estimated;finally.the corresponding parameters are identified from the state space estimated. Numerical analysis was studied and it indicates that: 1) the proposed method is strong in robust-ness, 2) arid the stronger of coupling in the structure and TMD, the worse of estimation of mass ratiobut the estimation of the other parameters is of high accuracy. Experimental tests were performed on a single-story frame structure to evaluate effec-tiveness of the method.

关 键 词：参数识别 TMD-结构耦合系统 模态分析 状态空间 自由振动测试 

分 类 号：TU311.3[建筑科学—结构工程] TU352.1