Vibration control of a seismically-excited structural building with MR dampers based on ICA-LQG

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (5) : 194-201.

LIN Xiu-fang 1,2 CHEN Shu-mei 2

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Abstract

Recently, MR damper has become an important smart semi-active control device. Firstly, to achieve its application in vibration control of a structural building, a new intelligent control strategy ICA-LQG combining the imperialist competitive algorithm (ICA) and the linear quadratic Gaussian (LQG) control approach was proposed to calculate ideal controlling forces. To overcome difficulties of determining weighted matrixes of LQG controller, ICA was adopted to optimize its parameters according to the constraint conditions for objectives to be optimized and damping force. Secondly, dynamic characteristics of MR damper based on Bouc-Wen model were obtained with tests. Finally, the clipped-optimal control (COC) was used to convert ideal controlling forces calculated with ICA-LQG into the control current of MR damper. To validate the effectiveness of the proposed semi-active control strategy ICA-LQG-COC integrating ICA-LQG and COC, a 3-story frame building was taken as an example, the aseismic results obtained with uncontrolled, two passive control, traditional LQG-COC and ICA-LQG-COC approaches, respectively were analyzed contrastively. The numerical results obtained under three seismic excitations demonstrated that in all control methods mentioned above, the proposed semi-active control strategy ICA-LQG-COC exhibits the most excellent comprehensive control performance and it can reduce the maximum displacement and acceleration responses of the structural building to the utmost extent.

Key words

magnetorheological (MR) damper / vibration control / imperialist competitive algorithm (ICA) / linear quadratic Gaussian (LQG) control

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LIN Xiu-fang 1,2 CHEN Shu-mei 2 . Vibration control of a seismically-excited structural building with MR dampers based on ICA-LQG[J]. Journal of Vibration and Shock, 2018, 37(5): 194-201

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