柔性自适应桁架及其振动最优控制实验  

Flexible adaptive truss testbed and its optimal control experiment for vibration

作　　者：赵国伟[1] 黄海[1] 夏人伟[1] 

机构地区：[1]北京航空航天大学宇航学院,北京100083

出　　处：《北京航空航天大学学报》2005年第4期434-438,共5页Journal of Beijing University of Aeronautics and Astronautics

基　　金：北京市科技新星资助项目 (95 2 873 90 0 )

摘　　要：基于dSPACE系统和所研制的锆钛酸铅(PZT)压电作动器,建立了第一阶频率低达5Hz的三棱柱自适应桁架实验平台,通过有限元建模和实验参数修正,利用异位加速度反馈信号进行了线性二次型Gauss(LQG)最优反馈控制实验和仿真.结果表明:对比无控状态,采用最优控制只需很小控制电压,可使桁架在低阶典型频率激励下的振幅降低90 %以上;而当桁架受扰动后,振动衰减时间减少超过80 % ;验证了实验平台配置的合理性和所研制的PZT压电作动器、控制模型的有效性;控制数值仿真与实验在加控前后振幅抑制程度相同,控制仿真与实验中振幅衰减过程的差别通过激振过程仿真与实验的对比得到了阐明.With dSPACE system and developed piezoelectric ceramic actuators, an adaptive truss shaped as a triangular prism was constructed as a testbed in this work. The first order natural frequency of the truss is as low as 5 Hz. With the feedback signals from accelerometers on different locations of the structure, and using linear quadratic Gaussian controller based on finite element method model and parameter modification through test, the experiments and simulations of vibration control were conducted. The results show that compared to the situation without control, the vibrating amplitude of the controlled adaptive truss under an exciting with fixed frequency can be damped more than 90%, and the sustained time of vibration after disturbance can be decreased over 80% with the proposed optimal control method. The configuration of testbed is verified to be reasonable, and also the property of actuators and control modeling are valid. In simulation and experiment, the vibrating amplitudes are decreased to same value, and the difference of amplitudes decreasing processes are illuminated by the contrast of exciting processes.

关 键 词：智能结构 桁架 振动控制 压电材料 

分 类 号：O302[理学—力学]