Research On Loading Control Model Of Servo Load Simulation System

Steering gear load simulation system is one of the main equipment of aircraft ground hardware-in-the-loop simulation,it can simulate the stress state of steering gear during the flight,the repeated tests and experiments on the performance of the experimental data obtained,and judge its performance advantages and disadvantages,in order to redesign and improve to craft,technical parameters of the steering gear system as a whole.Therefore,the performance of load simulator is directly related to the reliability and confidence of the simulation and test experiment,which is the basis for ensuring the accuracy and performance of aviation,space model products and weapon systems.In view of how to improve the load performance of load simulator,most scholars at home and abroad have focused on reducing the amount of spare capacity.Friction torque loading precision is not high,the author of this paper and appeared in the process of load fluctuation and time lag issues,from the analysis and study on friction torque load in the process of friction mechanism,adopt the method of experiment to explore the combined with PID control,the maximum increase friction torque load steady performance and dynamic performance.To this end,this article mainly carries on the following work:Firstly,the loading method and calculation method of friction torque are explained.Friction in the process of analysis of the friction torque loading static characteristic and dynamic characteristic of low speed performance of the system,and further explored by experiment when the friction coefficient at low speed with load and the changes of the hydraulic cylinder pressure by using the method of curve fitting is obtained under different pressure of friction torque compensation empirical formula,preparation for the next step of friction torque compensation experiment.Then,the transfer function method is applied to establish the mathematical model of loading system,and the empirical formula of torque compensation is added to the mathematical model for simulation.The mathematical model of the system is established by using the differential equation integral module method.The feasibility of the first modeling method is verified by simulation.The simulation results show that the torque compensation experience formula improves the control precision of the system.But the fluctuation and the response lag problem of the system,add the PID regulator to control model,the use of critical proportion method of setting PID controller parameters,by comparing the P controller,PI controller and PID controller,the simulation results of PI controller can effectively improve the system stability,dynamic performance and steady-state performance.Finally carries on the friction torque load experiment,the first by experimental verification friction torque compensation empirical formula is improved the precision of load torque,but appeared in the process of friction torque load fluctuation and lag problem was not solved,therefore,the PID controller module is added to the PLC control system,and then further experiments to explore after friction torque compensation and PID controller to adjust the influence of the system in all aspects.In conclusion,the combination of friction torque compensation and PID control improves the load performance of the system.