STIFFNESS OF ACTUATOR AMPLIFICATION AND ANALYSE OF GOVERNING ERROR IN ACTIVE VIBRATION ISOLATION
hang Tao1，2;Huang Hongbiao1;Wang Bin1，2;Zeng Taiying3;Xu Jia1，2;Liu Fang1，2;Zhao Fangfang1;Zhu Jianqiang1
1.Joint Laboratory for High Power Laser Physics, Shanghai Institute of Optical and Fine Mechanics CAS;2. Graduate University of Chinese Academy of Science, Beijing 100039, China;3.University of Shanghai for Science and Technology School of Communication and Art Design, Shanghai 200093, China
Abstract：Stiffness of actuator amplification and governing error in active vibration isolation (AVI) are investigated. The stiffness of the actuator should match the stiffness of the external load，and it can be amplified by connecting the actuator with a small stiffness spring in series if the load is heavy or the stiffness of actuator is low. The performance of AVI is analyzed when the governing error is evenly distributed. The results shows that in order to obtain the same performance of vibration isolation, improving relative accuracy of controller and increasing stroke of actuator are both needed when stiffness of actuator is amplified, the stiffness of actuator is equivalent to and can be substituted by its stroke and relative accuracy of controller which provides us the accordance to select controller and actuator in even wider area on AVI design.
2010, Vol. 29 
