Wavelet based system identification for a nonlinear experimental model

被引:1
|
作者
Li, Luyu [1 ,2 ]
Qin, Han [2 ]
Niu, Yun [2 ]
机构
[1] Dalian Univ Technol, State Key Lab Coastal & Offshore Engn, Dalian 116024, Liaoning, Peoples R China
[2] Dalian Univ Technol, Sch Civil Engn, Dalian 116024, Liaoning, Peoples R China
基金
美国国家科学基金会;
关键词
nonlinear system identification; wavelet transform; nonlinear test model; adjustable dampers; shake table test; SUBSPACE IDENTIFICATION; TRANSFORM; PARAMETERS;
D O I
10.12989/sss.2017.20.4.415
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
Traditional experimental verification for nonlinear system identification often faces the problem of experiment model repeatability. In our research, a steel frame experimental model is developed to imitate the behavior of a single story steel frame under horizontal excitation. Two adjustable rotational dampers are used to simulate the plastic hinge effect of the damaged beam-column joint. This model is suggested as a benchmark model for nonlinear dynamics study. Since the nonlinear form provided by the damper is unknown, a Morlet wavelet based method is introduced to identify the mathematical model of this structure under different damping cases. After the model identification, earthquake excitation tests are carried out to verify the generality of the identified model. The results show the extensive applicability and effectiveness of the identification method.
引用
收藏
页码:415 / 426
页数:12
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