INTEGRATED STRUCTURAL IDENTIFICATION AND VIBRATION CONTROL OF LARGE-SIZE STRUCTURES UNDER UNKNOWN EXCITATION

摘要

Structural health monitoring and vibration control of civil engineering structures have been actively investigated but treated separately according to their individual primary objective pursued. It's highly desirable to explore efficient algorithms for conducting integrated structural health monitoring and vibration control. In this paper, a time domain algorithm is proposed for integrated structural identification and vibration control of large-size structures under unknown excitation. A large-size structural building is decomposed into small size substructures based on its finite element formulation. Interaction effect between adjacent substructures is considered as ' additional unknown inputs' to each substructure. Structural parameters are estimated based on the extended Kalman estimator. Structural optimal active control forces are determined by the linear quadratic Gaussian (LQG) control scheme based on estimated values of structural parameters. The unmeasured external excitations are estimated by the leastsquares estimation approach. A numerical example of integrated structura l identification and vibration control of a multi-story shear building under unmeasured external excitation is studied to illustrate the performance of the proposed algorithm.