Reduced order design method for electro hydraulic position

servo system of a rotational equipments of large scale

XIAO Guo-lin1, DENG Zhi-yong1, TANG Guo-yuan2, HUANG Dao-min3, XIE Jin-hui1

（1. Wuhan Second Ship Design and Research Institute, Wuhan 430064, China; 2. School of Naval Archetecture

and Ocean Engineering, Huazhong University of Science and Technology, Wuhan 430074, China;

3. Air Force Early Warning Academy, Wuhan 430010, China）

Abstract: Hydraulic position servo systems are usually high order systems, which lead to some inconvenient for its design and optimization. Aiming at the require of some rotational equipment of large scale, the transform function of the system was built, and the distribution of poles and zeros was analyzed, which lead to the result that the non-dominant poles were remotely distributed to the dominant poles. Based on the works of above ,a reduced order method was presented to obtain the second order approximation of the system. The simulation indicates that the time response of the approximated second order system coincides with the original system well. The calibration method was presented, in which the calibration component was added to the forward path of the system .A pole and a zero of the calibrated system could be counteracted. Based on this,the parameters of this calibration component were calculated, which could ensure system no overshoot and rapid response.The simulation results indicate a good coincidence with the design requirement of the system.