Multi-axis Heavy-duty Vehicle Hydro-pneumatic Suspension Of Steering Mechanism Multi-objective Optimization

Multi-axis heavy-duty vehicles plays an important role in national economic development and extensive application in the field of transportation,how to improve the steering stability has important research value.Suspension steering mechanism at the wheels on both sides of the installation position and has important effect on vehicle handling stability,and the impact on the vehicle are various,including steering transmission system and wheel alignment parameters,etc.Previous studies was focus on a single objective optimization,only on one wheel steering mechanism installation location optimization and set up the movement of the interference model is more for the plane model,but the simplified analysis method of optimized results can lead to inaccurate.In view of the shortcomings of the above research,this article in view of the installation location points on both sides of the wheel steering mechanism,creat a multi-objective optimization design model which considering steering system movement interference and wheel alignment parameters deviation at the same time.This model makes the optimization of steering mechanism result more accurate and Conform to the actual design.The research object of this article is a multi-axle heavy load vehicles.This paper first analyzes the suspension guide bar system's influence on the vehicle steering transmission system,established the mathematical model of a spatial interference analysis of the Steering knuckle arm ball pin center,after optimizing the goal functional,analysis it in MATLAB and solve.Then,according to the real vehicle data,set up the vehicle chassis multi-body dynamic model of the first shaft,after the analysis of wheel alignment parameters,using the response surface method,make co-simulation in the environment of ADAMS/Insight and ADAMS/View,get the single objective optimization results.After make a normalization treatment on the Two single objective model's functional results,then creat a multi-objective optimization design function that considering steering system movement interference and wheel alignment parameters deviation at the same time.,After considering the sensitivity of each variable,discretization the variables in a reasonable manner.then use MATLAB tools to calculate,finally obtain the multi-objective optimization results,namely obtain the optimized guide bar department installation location.In the steering system movement interference model for single objective optimize,the optimized movement interference quantity reduced from 13.9876 mm to 10.5281 mm,compared with before optimization was reduced by 24.73%,improve the steering stability of steering system to some extent.In the single objective optimization model of wheel alignment parameters movement deviate,the optimal installation location point better improved the fluctuation range of wheel alignment parameters deviated from its initial value in the process of movement,which reduce the standard deviation,Increase running condition of the wheel.In multi-objective optimization model,the multi-objective optimal result value was reduced by 29.52% compared with the former,among them,the amount of interference model was reduced by 11.2%,wheel alignment model standard deviation was reduced by 47.79%.Compared with the single objective optimization,Multi-objective optimization is obtained by a comprehensive multi-factor optimization results.