【摘要】 运用压电智能材料频响范围宽、响应速度快的特点,设计制作了双向受力压电主动杆件,通过动力特性以及驱动性能测试,得到了压电主动杆件的驱动增益函数和频响特征;基于遗传算法,对网壳结构进行主动控制时主动杆件的数目和布置位置进行了优化设计;运用8个自主研制的压电主动杆件,对一凯威特网壳模型进行了主动控制振动台试验,对压电主动杆件采取循环开/关闭合驱动的方法,实现了对结构的多点最优控制,并使结构的竖向及水平加速度和位移均得到了良好的控制。结构的模态频率最大抑制达到14%,模态阻尼比最大提高了2.2。更多还原

【Abstract】 According to the wide frequency response range and fast response characteristics of the piezoelectric smart material,a two-way stress piezoelectric driving lever is designed.After testing the dynamic performance and driving effects of the piezoelectric driving lever,its driver gain function and frequency response feature are attained.Then based on the result of genetic algorithm,an optimization design of the driving lever′s numbers and layout comes out.After that,an active control experiment on the vibrating table is made,in which eight piezoelectric driving levers are used to operate on the Kewitte latticed shell model with the closed switch method.The final results show that the special design of the experiment can implement optimal multi-point control over the structure.The acceleration and displacement of vertical and horizontal get a good control effect respectively,the maximum modal frequency control attain to 14%,and the maximum modal damping increase is 2.2,which further inspects and verifies the theory and method proposed in this paper.更多还原