| Synchronous control of hydraulic system is an important research direction of hydraulic technology,It is one of the urgent problems to be solved in production practice.The synchronous control of hydraulic motors is more difficult than the synchronous control of hydraulic cylinders in production.Because in hydraulic synchronous control,the speed measurement and fluctuation pulse of the motor are difficult to meet the control characteristics of the synchronous system.This article takes the positioner system driven by the electro-hydraulic servo valve control double hydraulic motor as the research object.Research the synchronization control principle,synchronization control strategy and controller construction in the hydraulic synchronization system.What kind of control method and strategy are adopted to improve the performance of the positioner system is the key to this article.The positioner is a typical multi-rigid body dynamic model,and the Lagrangian energy equation can be used to build the dynamic equation.In the hydraulic system,the working principle of the valve-controlled motor system is first introduced.At the same time,the mathematical model and transfer function of the valve-controlled motor system are established based on the flow continuity equation and the force balance equation.Finally,the ADAMS-AMESIM-MATLAB software is used for joint Simulation to verify the rationality of the model.In the overturning condition of the positioner system,the software exchanges data in real time,The input signal in the control system is the position synchronization error and additional axial force of the two drive screws in the positioner system,which are imported into the controller built in MATLAB/Simulink for closed-loop synchronization control.After feedback and comparison,the output control signal is imported into the hydraulic servo valve in AMESIM to control its spool opening degree,which is used to change the flow of the circulating hydraulic motor to change the motor speed,and finally realize the synchronous control of the position of the hydraulic motor.In order to improve the system response speed and synchronization control accuracy,the valve-controlled hydraulic motor position synchronization system is selected as the research object.In the selection of the control strategy,the PID controller,which is widely used in engineering,is first used to build a mechanical-electric-hydraulic system for co-simulation.In order to improve the control accuracy and robustness,according to the characteristics of the electro-hydraulic servo valve,fuzzy PID control,auto-disturbance rejection control and sliding mode variable structure are respectively used for system co-simulation.Analyze and compare the operating effects of the valve-controlled hydraulic motor position synchronization control system based on different control strategies,the dynamic response of the positioner under the overturning condition,and the performance of the key hydraulic components in the hydraulic system.It provides a solution to the jamming phenomenon of the screw caused by the poor synchronization accuracy of the screw in the turning condition of the positioner,and provides a certain theory and practice for the synchronous control of the valve-controlled hydraulic motor system. |
PDF Full Text Request