Research On The Characteristic And Control Strategy Of The Triaxial Hydraulic Loading System For Vehicle's Wheels And Transmission Bridges

With the rapid development of vehicle industry,the problem of the vehicle's running stability has become an concern issue,vehicle's wheels and transmission bridges is an important problem to decide the stability of the vehicle running.Research objective of this paper is triaxial hydraulic loading system for vehicle's wheels and transmission bridge which introduced the secondary regulation technology,from test research,Characteristics,control strategies and decoupling of triaxial hydraulic loading system for vehicle's wheels and transmission bridge,the conclusion is provide theoretical basis for improving hydraulic secondary regulation loading technique.Multi-degree of freedom transfer function model for the vehicle's wheels and transmission bridges system is established,correctness of the model is verified by the text,utilization of the model,dynamic analysis of vehicle's wheels and transmission bridges is conducted,vehicle's wheels and transmission bridges consists of three parts,speed control system and left and right wheel loading system,analysis includes frequency domain and time domain characteristics,affect of flexible links and system parameters.To improve the system characteristics,this paper introduction of fuzzy control,dynamic robust compensation control and H? robust control to the vehicle's wheels and transmission bridges,from the dynamic simulation analysis,the control effect of the above three control methods is more obvious.There are two coupled interference in the system,one is hydraulic coupled interference,the other is mechanical coupled interference,they will bring adverse effects to the system,so this paper give two method,one is decoupling by the decoupling element,the other is dynamic robust compensation decoupling,from the dynamic simulation analysis,the results of the decoupling are satisfactory.To further analyze the characteristics of the system,and experimental study of the system,text include static characteristic test,step and sinusoidal response characteristics test,PID controller parameter tuning test.From the test results,dynamic simulation results are correct,thus it can be verified multi-degree of freedom transfer function model of vehicle's wheels and transmission bridges is correct.Text conclude that further evidence of the system has good static and dynamic,loading text requirements to meeted for vehicle's wheels and transmission bridges meet the vehicle wheel axle load test requirements.