Smart Structures and Systems

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Wavelet based system identification for a nonlinear experimental model

  • Li, Luyu (State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology) ;
  • Qin, Han (School of Civil Engineering, Dalian University of Technology) ;
  • Niu, Yun (School of Civil Engineering, Dalian University of Technology)
  • Received : 2016.10.13
  • Accepted : 2017.09.18
  • Published : 2017.10.25
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Abstract

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.

Keywords

Acknowledgement

Supported by : National Science Foundation of China

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