空间桁架模型压电摩擦阻尼器半主动优化控制

Semi-active optimization control of space truss model with piezoelectric friction damper

基于压电材料的逆压电效应,将压电陶瓷驱动器与被动摩擦阻尼器结合,设计了一种新型压电摩擦阻尼器,通过施加电压来改变摩擦片间的滑动摩擦阻尼力,从而实现结构的实时半主动控制。分析了该阻尼器的工作原理和构造方法,推导了相应的阻尼力模型。采用遗传算法对空间桁架模型结构进行了不同数量下压电摩擦阻尼器布置位置的优化研究,并利用基于线性二次型经典最优控制(LQR)算法的半主动控制策略,分析了不同数量压电摩擦阻尼器在随机布置和优化布置下对结构地震反应的控制效果。结果表明,新型压电摩擦阻尼器对空间桁架模型结构的地震反应有较好的抑制效果,采用遗传算法进行阻尼器优化布置后,最大控制效果可达57%,相比随机布置阻尼器时控制效果可提高近8%。

Based on the piezoelectric effect of piezoelectric materials,a new piezoelectric friction damper was designed by combining the piezoelectric ceramic with passive friction damper. The sliding friction damping force was changed between the friction plate by applying voltage,and real-time semi-active control to structure was realized. Working principle and construction method of the damper was analyzed and the corresponding damping force model was derived.Different numbers of piezoelectric friction damper layout optimization was researched for space truss structure by using genetic algorithm. And through adopting the semi-active control strategy based on LQR algorithm,different numbers of piezoelectric friction damper control effect of seismic response was analyzed at random layout and optimized layout of dampers. The results show that the piezoelectric friction damper has good mitigation effect to seismic response of the space truss model. After using genetic algorithm to optimize damper layout,the biggest control effect reaches 57%,and the control effect is improved by 8% compared with the random setting damper.