Research On The Speed Control Technology Of Hydraulic Control High-speed Reversing Valve With Rotary Spool

Hydraulic control high-speed reversing vibration exciter with rotary spool is mainly used in places where precise vibration is required such as earthquake simulation and fatigue experiments,its key element is the hydraulic control high-speed reversing valve with rotary spool.Spool speed is a key factor affecting the output accurate waveform of vibration exciter,how to get stable and reliable speed becomes a key technical problem.This article started to study the spool speed from two aspects.First,the factors that affected the spool speed were studied and the influencing laws were explored.Second,the mathematical model of the proportional speed-regulated valvecontrolled motor system was obtained by system identification.The PID controller was designed to reduce the valve core speed oscillation and improve the system stability.Supported by the National Natural Science Foundation of China(51675472),The hydraulic control high-speed reversing valve with rotary spool was studied.By analyzing the working principle of the hydraulic control high-speed reversing excitation system with rotary spool,the AMESim simulation model was established and the influence of related parameters on the spool speed of the hydraulic control high-speed reversing valve with rotary spool was studied.The mathematical model of the proportional speed-regulated valve-controlled motor system was established by system identification,The PID controller with the objective of stable spool speed was designed.Related experiments were performed by building a model prototype experiment bench,the correctness of theoretical research was verified.The main research work of this paper is as follows:In the first chapter,the application occasion,working principle and advantages and disadvantages of electro-hydraulic exciter were introduced.The research status of high-frequency servo valves and hydraulic rotary valves at home and abroad were surveyed and their current research progress and results were summarized.The current market demand and the existing research deficiencies were analyzed,and the purpose and significance of the research of the hydraulic control high-speed reversing valve with rotary spool were proposed.Finally,the main research contents and solutions of this paper were explained.In the second chapter,the structure of the hydraulic control high-speed reversing valve with rotary spool and the working principle of the hydraulic control high-speed reversing excitation system with rotary spool were introduced,the mathematical model of the flow area of valve ports which have different shapes was established and valve area characteristics was analyzed.The theoretical basis for establishing the AMESim simulation model of the hydraulic control highspeed reversing valve with rotary spool was provided.In the third chapter,the principle of the hydraulic control high-speed reversing excitation system with rotary spool was introduced.The mathematical model of the hydraulic control highspeed reversing excitation system with rotary spool was built.The AMESim simulation model of the hydraulic control high-speed reversing valve with rotary spool was established.the factors that affect the spool speed(supply pressure,spool inertia,hydraulic torque,external load,axial length of valve port,number of ports)were analyzed and the influence law was explored.In the fourth chapter,the system identification experiment was designed,the proportional speed-regulated valve-controlled motor system was identified to obtain better transfer function.For the unit step response of the proportional speed-regulated valve-controlled motor system,there were steady-state error,excessive overshoot,and unstable speed,to avoid this phenomenon,the PID controller for spool speed control was designed and used for simulation analysis.In the fifth chapter,the prototype experiment bench for the hydraulic control high-speed reversing excitation system with rotary spool was established,the Simulink model of the hydraulic control high-speed reversing excitation system with rotary spool in the open-loop state was built and used to collect data,the accuracy of the AMESim simulation model was verified by experiments.The PID controller Simulink model which based on open loop experiments was built for experiments,by comparing with PID controller simulation results,the effectiveness of the PID controller which built was verified.In the sixth chapter,the main work of this paper was summarized,and the future research directions were prospected.