Physical modelling and analysis of electro-hydraulic position servo systems for single rod hydraulic cylinders

Abstract

The electro-hydraulic position servo system of a single rod hydraulic cylinder is used in a large number of engineering applications due to its compact structure, but due to its asymmetric structure and complex mathematical model, many factors cannot be accurately analysed by mathematical methods. To address this problem, a physical model of the electro-hydraulic servo system of a single rod hydraulic cylinder is established using Matlab/Simulink multi-domain physical modelling method to study and analyse its performance. The response graphs and Bode plots are obtained by inputting sinusoidal and square wave signals respectively. The simulation results show that: the physical model of the electro-hydraulic position servo system of a single rod hydraulic cylinder can directly add the corresponding components and environmental influence factors according to the working principle, the model accuracy is high, no transfer function is required, and the simulation results are more accurate and closer to the actual situation, which is conducive to the analysis of the control performance of the electro-hydraulic position servo system and has a more effective reference value to improve the accuracy of the system model simulation.

Keywords

• single rod hydraulic cylinder|electronic hydraulic position valve system|physical model|matlab/simulink