A novel method with velocity control to restrain pressure impact in an electro-hydraulic position servo system

作者：Xu Xiao Qing; Quan Long^*

来源：Journal of Vibration and Shock, 2013, 32(2): 107-110.

• Dynamic process
• Electro hydraulic servo system
• Electrohydraulic position servo systems
• Flow rate calculations
• High pressure chambers
• Hydraulic impacts
• Oil flow rate
• Oil sources
• Pressure impact
• Servo-valve
• Source pressure
• Velocity feedback
• Volume change
• Volume flow rate

An electro-hydraulic position servo system has a large demand of source oil flow rate in starting, reversing and dynamic processes. Hydraulic impact may appear when the supply of flow rate is not enough. To solve this problem, a novel method with velocity feedback was proposed. An actuator velocity was detected and the volume flow rate caused by volume change of the actuator's high pressure chamber was calculated. When the volume flow rate was larger than the actual flow rate supplied by a oil source, a shorter process of source pressure sudden drop would appear. With adjusting the servo valve's input, the actuator's actual flow rate could be controlled always less than the supplied flow rate and the hydraulic impact could be eliminated. Simulation results and test results showed that the proposed method is easy to realize, and the hydraulic impact caused by the insufficient source oil flow rate is restrained obviously.

• 出版日期2013
• 单位太原理工大学