New Modeling and Analysis of Three-Stage Electro-Hydraulic Servo Valve

To develop higher performance three-stage electro-hydraulic servo valve, a new modeling software, AMEsim, is used to develop its non-linear model according to the construction and principles presented in this paper. The results of simulation and experimental test about an existing valve are consistent, which proves the model is right. Based on the analysis of the model, the performances of three-stage electro-hydraulic servo valve are mainly affected by pilot valve performance, spool and sleeve performance, position transducer performance and servo controller performance. The methods of modeling and analysis possess universal significance to other similarity system.