Support vector machine based semi-active control of structures:a new control strategy

摘要

The present paper presents the support vector machine (SVM)-based semi-active control algorithm usednfor designing general dampers for multistorey structures under earthquakes. First, the linear quadratic regulatorn(LQR) controller for the numerical model of a multistorey structure formulated using the dynamicndense method is obtained by using the classic LQR control theory. Then, a SVM model is designed andntrained to emulate the performance of the LQR controller. Likewise, this SVM model comprises the observersnand controllers of the control system. Finally, in accordance with the features of general semi-activendampers, a SVM-based semi-active control strategy is put forward. More specifi cally, an online autofeedbacknsemi-active control strategy is developed and then realized by resorting to SVM. In order tonnumerically verify the control effectiveness of the present control strategy, the time history analysis hasnbeen implemented to a structure with general dampers designed by the SVM-based semi-active controlnalgorithm. In numerical simulations, four seismic waves including the El Centro, Hachinohe and Kobenwaves, as well as the Shanghai artifi cial wave, whose peak ground accelerations are all scaled to 0.1 g, arentaken into consideration. Comparative results demonstrate that general semi-active dampers designed usingnthe SVM-based semi-active control algorithm is capable of providing higher level of response reduction.nCopyright © 2009 John Wiley & Sons, Ltd.