Research On Control Technology Of Separate Cavity Independent Control Electro-hydraulic Servo Valve

Electro-hydraulic servo valves are widely used in fields such as aerospace,nuclear industry,and seismic wave testing,due to their advantages of high output power,fast response speed,strong load adaptability,and controllable parameters.However,with the emergence of more and more complex working conditions,the response speed of largeflow electro-hydraulic servo valves put forward higher requirements,at present,China’s high-frequency echo large-flow servo valves are not mature,the gap is large,and high-performance products are still subject to people,becoming one of the neck fields in hydraulic control.This paper mainly introduces the following aspects:Firstly,this paper introduces the working principle of a high-flow electro-hydraulic servo valve and the composition and principle of the electro-hydraulic servo system with independent cavity control.Based on the principle of independent cavity control,a new design scheme for electro-hydraulic servo valve is proposed,including synchronous control and independent control of the cavity,and its working principle is described in detail.In addition,a flow matching strategy for the pilot stage servo valve based on driving power is proposed,and relevant component selection is conducted.Meanwhile,the structure of valve core,valve sleeve,and main valve body are designed to lay the foundation for subsequent analysis.Next,a mathematical model was established for the divided-chamber synchronized control electro-hydraulic servo valve and its relevant analysis was conducted.The AMESim software was used to build a simulation model and compare it with the traditional three-stage electro-hydraulic servo valve.Then,a mathematical model was built for the divided-chamber independent control of the main valve spool,and its static and dynamic characteristics were analyzed using AMESim software to provide a theoretical basis for its forward design.Finally,four operational modes of the main spool of the independent chamber control electro-hydraulic servo valve were analyzed from a mechanical perspective.Based on the analysis results,a transcendental control strategy was proposed to improve the response speed of the main spool,and an acceleration feedback control strategy was introduced to further enhance its response characteristics.The feasibility of the transcendental control strategy was verified using simulation software,and it was found that the response speed of the main spool was significantly improved.