The Modeling and Simulation of Electro-Hydraulic Servo Valve Based on Modelica/MWorks

摘要

An electro-hydraulic servo valve is a typical complicated multi-domain system constituted by mechanical, electrical, hydraulic and magnetic components, which is widely used in electro-hydraulic servo systems such as construction machinery, heavy equipment and weapon. The traditional method of modeling and simulation of servo valve is based on block diagram and signal flow, which cannot describe the valve from components level or be used in modeling of overall servo systems, computational causality must be involved in modeling of which, and difficult to be modified.Modelica is an object-oriented modeling language which is suited for large, complex, heterogeneous and multi-domain systems, which is created by Prof.Hilding Elmqvist and developed by Modelica Association. The key features of Modelica are multi-domain, object-oriented and non-causal, which are suitable for modeling of servo valve.MWorks is an integrated computing platform of modeling, simulation and optimization based on Modelica, which is developed by Suzhou Tongyuan Software Information Technology Co., Ltd.with proprietary intellectual property rights.In this paper, a modeling and simulation of electrohydraulic servo valve is discussed, which leads to a readable, easy to modify and reuse model due to the key features of Modelica. The simulation results show similar curves with traditional method, and the model of servo valve can be used in overall system design and simulation. This new servo valve modeling and simulation method based on Modelica/MWorks can provides the engineers a more efficient way to design a servo valve and an overall servo system.