Abstract Some comm on questions are discussed and analyzed in w hich the hydraulic system design of electro—hydraulic servo static＆．dynamic universal test machine，which include load matching，servo valve applying，actuator natural frequency improving，clamping device and cooling system design．Some principles are put forward to which design the sim ilar hydraulic system ，the principles was verified by to design 1 MN electro-hydraulic servo static＆dynamic universal test machine and yield good result，it can serve as a reference for engineers w ho w ant to design this kind of test machines．
YANG Ke-Sen, XI Zhong-Hui, LI Hong-Wei, CHENG Yong-Quan. Some design principles on hydraulic system of the electro-hydraulic servo static& dynamic universal test machine. Chinese Journal of Engineering Design, 2002, 9(3): 144-146.
