Dynamic and static characteristics of 2D electrohydraulic proportional servo valve in vibration environment
                                            PENG Kuandong1, ZHANG Xueliang1, ZUO Qiang2, ZHENG Long1, ZENG Bin3
(1.Institute of Highend Equipment, Hangzhou Polytechnic, Hangzhou 311402, China;2.School of Engineering, Zhejiang University City College, Hangzhou 310015, China;3.School of Information Engineering, Zhejiang A＆F University, Hangzhou 311300, China)

Abstract: In order to solve the need of reliable high pressure and large flow proportional servo directional valve for hydraulic system under vibration environment and the new requirements of actual high end hydraulic system, the compact 2D electro hydraulic proportional servo directional valve with large flow rate was proposed. The working principle of the spiral servo mechanism of the valve was analyzed, the mathematical model was established, the flow equation of the guide control stage was derived, and the mechanical balance equation of the main valve core was derived based on the vibration condition, and the dynamic response simulation analysis was carried out by using Matlab. Experiments on static and dynamic characteristics were carried out. The experimental results show that simulation analysis, mathematical analysis and experimental results are basically consistent. Under the vibration environment, the hysteresis loop is 2.9% and the static characteristic is good. The bandwidth corresponding to -3 dB，-90 °is about 85 Hz. The dynamic characteristic basically accords with the design requirement, the vibration reliability is good.

Key words: walking machinery; matlab; electrohydraulic proportional servo valve; static and dynamic characteristics