Simulation And Optimization Of Full Hydraulic Steering System For An Articulated Rubber-tired Vehicle

Articulated rubber-tired vehicle is a special kind of underground transport vehicles?It can transport mechanized coal mining equipment and hydraulic support to the underground directly with fast speed and great capacity,which can save a lot of auxiliary operators thus improving transport efficiency.Full hydraulic steering system,which has no mechanical connection between the steering gear and steering mechanism,connecting steering cylinder with the hydraulic tubing,is commonly used in agricultural machinery,engineering machinery,forklifts and other industries.The prominent problem that faces the steering system for an articulated rubber-tired vehicle now is the pressure pendulum in the process of steering,which seriously affect the performance of the steering system.Therefore,this paper takes the load-sensitive full hydraulic steering system of the articulated rubber-tired vehicle as the research object,aiming at the problem of the pressure pendulum of the hydraulic steering system for an articulated rubber-tired vehicle.The research is as follows:Starting from the hinged way,the analysis of the articulated steering system is carried out to study the factors influencing the cylinder pressure and the stroke of the steering cylinder.To reflect the actual conditions,AMESim is used to model two important components-the priority valve and the steering units of the full hydraulic steering system,and then analyze its performance.ADAMS is used to establish virtual prototype model of articulated rubber-tired vehicle.According to the AMESim hydraulic model and the ADAMS virtual prototype model,the mechanical-hydraulic co-simulation model of the full hydraulic steering system for an articulated rubber-tired vehicle is established.Based on the simulation results of the steering system,it is found that there is a serious pressure pendulum in the steering process.In view of this problem,an optimization of articulated steering system has been conducted with the maximum stroke distance of the left and right cylinders as well as the maximum cylinder pressure as the minimum optimization target and the design of the hinge position of the cylinder as the design variable.The validity of the optimization is verified through the mechanical-hydraulic co-simulation model of the full hydraulic steering system for an articulated rubber-tired vehicle.The simulation results show that the maximum pressure of the steering system is reduced by 18.86%,the amplitude of the vibration is reduced by 19.41%.The optimization effect is obvious.