Geometric Parameter Optimization And Dynamic Simulation Of Double Wishbone Front Suspension Of Electric Wheel Mining Dump Truck

As one of the important parts of the vehicle,the suspension is generally composed of elastic elements and shock absorbers.The geometric parameters of the suspension system affect the handling stability of the vehicle and the degree of tire wear.A large electric wheel mining dump truck has always used the traditional candle suspension.Now it is necessary to design a new double wishbone front suspension to meet the actual demand.In order to explore whether its performance meets the best use requirements,this thesis takes the wheel lateral slip as the main evaluation goal,and studies the dimensional parameters and performance parameters of the suspension.The main contents are as follows:Firstly,according to the data provided,the three-dimensional model of the front suspension is built.In order to facilitate the follow-up simulation work,the three-dimensional solid model is split and simplified,and the structural diagram of the multi link model of the front suspension is obtained.Based on the structural diagram,the suspension model is built in Adams and assembled with the experimental bench.The kinematics simulation and result analysis of parallel wheel jump of the assembled suspension are carried out in ADAMS,and the variation curves of wheel slip,toe in angle,camber angle,kingpin caster angle and kingpin inclination angle with wheel jump are obtained.Then,the model is integrated with isight to analyze the sensitivity of the suspension,and the suspension hard point coordinates that have a great impact on the wheel side slip and wheel alignment parameters are obtained.Then,according to these hard point coordinates with great influence,the approximate model is fitted,and the response surface fitting model and orthogonal polynomial fitting model are obtained respectively.At the same time,the accuracy of the approximate model is also verified.Based on the two approximate models,the multi-objective optimization is carried out respectively.The objective is to minimize the wheel side slip and ensure that the positioning parameters do not change greatly.The two groups of optimized suspension hard point coordinates are obtained.On the premise of ensuring the minimum amount of side slip,check whether the changes of wheel alignment parameters of the two groups of optimized models meet the requirements.At the same time,the changes of wheel alignment parameters of the two optimization results are compared,and the optimized suspension hard point coordinates are finally determined,which improves the kinematic performance of the suspension.Finally,based on the kinematics optimized model,the dynamic simulation of suspension is carried out.Analyze the simulation results,complete the sensitivity analysis,build the response surface approximate model according to the sensitivity analysis results,and optimize the liner linear stiffness of the upper and lower cross arms of the suspension with the liner linear stiffness of the suspension as the input and the wheel side slip as the output optimization objective.According to the optimization results,the simulation results show that the wheel side slip before and after optimization is reduced.Based on the spatial dimension data of suspension installation provided by the manufacturer,this thesis completes the construction of the three-dimensional model of the suspension,simplifies the model according to the requirements,obtains the mechanism diagram of the suspension,completes the construction of the suspension dynamic model and the simulation of kinematics and dynamic behavior,and finds out the optimized suspension index.According to the main optimization objectives,the hard point coordinate optimization of suspension and the linear stiffness optimization of bushing are completed.This provides theoretical data support for the rear suspension design.