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《Earthquake Resistant Engineering and Retrofitting》 2007-01
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A Improved Algorithm for Instantaneous Optimal Control of Structures Subjected to Seismic Excitation

Du Yong-feng,Liu Yan-hui,Li Hui(Institute of Earthquake Protection and Disaster Mitigation,Lanzhou Univ.of Tech.,Lanzhou 730050,China)  
A generalized algorithm for instantaneous optima control of structures subjected to earthquake excitation is presented based on the way in which the earthquake is input to a structural system.The control objective function is constituted in every time step,and the calculation is realized using the numerical method of state transition.An expression of control force is obtained,which includes both the effect of initial structural response and initial external seismic excitation of this time step.The model for calculating the control force is conceptually improved compared to existing instantaneous optimal control algorithm.An expression of optimal control force coefficients is derived in replacement of the solving of traditional Riccati equation,which is a differential equation,and the efficiency of the calculation is thus improved.Simulation result shows that the proposed method is advantageous over the classical optimal control and instantaneous optimal algorithms in terms of control efficiency,and has almost the same stability with the classical optimal control algorithms.
【Fund】: 国家自然科学基金资助项目(50548016)
【CateGory Index】: TU311.3
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