A Novel Method with Velocity Control to Restrain Pressure Impact in Electro-hydraulic Position Servo System

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

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A Novel Method with Velocity Control to Restrain Pressure Impact in Electro-hydraulic Position Servo System

XU Xiaoqing, QUAN Long

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Abstract

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

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electro-hydraulic servo system / hydraulic impact / flow rate calculation

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XU Xiaoqing;QUAN Long. A Novel Method with Velocity Control to Restrain Pressure Impact in Electro-hydraulic Position Servo System[J]. Journal of Vibration and Shock, 2013, 32(2): 107-110