An adaptive LQR controller based on PSO and maximum predominant frequency approach for semi-active control scheme using MR Damper

被引:8
作者
Kumar, Gaurav [1 ]
Kumar, Ashok [1 ]
Jakka, Ravi S. [1 ]
机构
[1] Indian Inst Technol, Dept Earthquake Engn, Roorkee 247667, Uttarakhand, India
关键词
Maximum predominant period; PSO; LQR; MR damper; PARTICLE SWARM OPTIMIZATION; SEISMIC RESPONSE REDUCTION; STRUCTURAL CONTROL; MAGNETORHEOLOGICAL DAMPERS; ALGORITHM; DESIGN; MODEL;
D O I
10.1051/meca/2018018
中图分类号
TH [机械、仪表工业];
学科分类号
0802 ;
摘要
In the linear quadratic regulator (LQR) problem, the generation of control force depends on the components of the control weighting matrix R. The value of R is determined while designing the controller and remains the same later. Amid a seismic event, the responses of the structure may change depending the quasiresonance occuring between the structure and the earthquake signal. In this situation, it is essential to update the value of R for conventional LQR controller to get optimum control force to mitigate the vibrations due to the earthquake. Further, the constant value of the weighting matrix R leads to the wastage of the resources using larger force unnecessarily where the structural responses are smaller. Therefore, in the quest of utilizing the resources wisely and to determine the optimized value of the control weighting matrix R for LQR controller in real time, a maximum predominant period tau(max)(p) and particle swarm optimization-based method is presented here. This method comprises of four different algorithms: particle swarm optimization (PSO), maximum predominant period approach tau(max)(p) to find the dominant frequency for each window, clipped control algorithm (CO) and LQR controller. The modified Bouc-Wen phenomenological model is taken to recognize the nonlinearities in the MR damper. The assessment of the advised method is done on a three-story structure having a MR damper at ground floor subjected to three different near fault historical earthquake time histories. The outcomes are equated with those of simple conventional LQR. The results establish that the advised methodology is more effective than conventional LQR controllers in reducing inter-story drift, relative displacement, and acceleration response.
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页数:10
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