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Wang B.,Wuhan University | Wang B.,Bridge Science Research Institute LTD | Wang B.,Hubei Key Laboratory of Bridge Structure Safety and Health | Wang Z.,Bridge Science Research Institute LTD | And 5 more authors.
Journal of Earthquake Engineering and Engineering Vibration | Year: 2011

To investigate the parametric optimization algorithm of multiple tuned liquid mass damper, the three parameters improved weighted satisfaction degree equation with dynamic magnification factor of main structure and MTLMD system is established by using satisfaction degree objective function. The optimal damping ratio and frequncy ratio of MTLMD system with the suspenders on Dashengguan Bridge across the Yangtze River in Nanjing are analyzed, and the relationship with the satisfaction degree, confidence index and optimized parameters are obtained. The research indicates: the optimization algorithm with satisfaction degree index is to transmit the optimization objective to the realization of the maximum value of the minimal satisfaction degree essentially, the results obtained by using this algorithm is better than that with traditional optimization method, and this new algorithm makes MTLMD system optimization objective much more clear and intelligent. The results can be applied to engineering practice. Source

Wang B.,Bridge Science Research Institute LTD | Wang B.,Hubei Key Laboratory of Bridge Structure Safety and Health | Wang B.,Wuhan University | Wang Z.-X.,Bridge Science Research Institute LTD | Wang Z.-X.,Hubei Key Laboratory of Bridge Structure Safety and Health
Zhendong yu Chongji/Journal of Vibration and Shock | Year: 2013

In order to solve cable vibration problems due to span increase for a cable-stayed bridge, a lever mass damper (LMD) for cable vibration reduction was proposed. The structural characteristics and action mechanism of a LMD were introduced, the cable-LMD system's vibration equations were established. The equivalent damping force model of LMD and the modal mass ratios of LMD and the cable were deduced, and the cable logarithmic decay rates of the first 15 modes were studied through theoretical calculations and model tests. The results showed that due to three feedback functions of LMD inertia, stiffness and damping, and the adjusting amplification effect of the cable, the vibration reduction effect of LMD is better than that of a viscous shearing damper with the same installation height. Because of the better bridge landscape effect, and convenience for installation and maintenance, LMD provided a reliable solving scheme for cable vibration control of a cable-stayed bridge with thousand-meter scale span. Source

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