Study on Multiple Hydraulic Cylinders Synchronous Control Under Impact Load

Abstract

In engineering, it is often necessary to use multiple hydraulic cylinders to drive the load at the same time. Under the impact load, because of the compressibility and leakage of hydraulic oil is inevitable, it is difficult to accurately control the speed of the actuator. Firstly, the compression and leakage of the hydraulic oil under the impact load are analyzed theoretically, and the main factors affecting the speed stability of the hydraulic cylinder are obtained. A multiple hydraulic cylinders synchronous control experimental circuit with electro-hydraulic proportional PID control is designed, which is composed of pump station, oil cylinders, displacement detection sensors and computer control system. The master–slave control strategy, electro-hydraulic proportional closed-loop control and fuzzy PID weighted control algorithm are adopted, and the simulation results show that this method can realize the stable control of hydraulic cylinder speed, and improve the synchronous control accuracy of multiple hydraulic cylinders, and the synchronous accuracy is within 0.5 mm. Finally, the experimental platform is built for practical verification, and through data acquisition and displacement monitoring of the system, it can be proved this method can realize the accurate synchronization of displacement driven by four hydraulic cylinders. The results show that the system is easy to control and has high synchronization accuracy, which can provide a reference for the design of multiple actuators synchronization control.