Design And Optimization Of Mcpherson Suspension System Of Mining Truck Based On Multi-body Dynamics And Finite Element Method

Suspension is an important part of modern trucks.Its kinematics directly affect the ride comfort and handling stability of the truck,and its structural strength has an extremely important impact on the safety of the truck in operation.Therefore,analyzing and optimizing the suspension in terms of kinematics and dynamics is one of the core directions of truck design and development.This paper aims at the application of key technologies of Mac Pherson suspension to large offhighway vehicles,establishes a multi-body kinematics model of the whole vehicle,writes parametric analysis and optimization software for the suspension hard point coordinates,and screens and optimizes the suspension hard points.Collect typical road conditions,establish a multi-body dynamics model of the whole vehicle,obtain the boundary load of the suspension finite element model,and perform finite element simulation analysis on the key components of the suspension.The main work of this paper is as follows:(1)Focusing on the analysis and optimization of the kinematics characteristics of the Mc Pherson suspension of a mining truck,a multi-body kinematics model of the Mac Pherson suspension is established,and the kinematics simulation and analysis are carried out by adopting the analysis method of the two-sided wheel hop in the same direction;Based on the secondary development of ADAMS,a software for parametric analysis and optimization of the kinematics of Mac Pherson suspension was written,and the hard point coordinates with greater influence were selected as design variables to optimize the design of the suspension system.(2)In view of the problems of a few researches on typical working conditions of mining trucks and lack of input excitation for the whole vehicle multi-body dynamics model,the road excitation is collected and analyzed based on data acquisition system for three typical working conditions of mine straight road,unilateral tooling road and bilateral tooling road.(3)Aiming at the multi-body dynamics problem of Mc Pherson suspension and steering system of mining truck,the road excitation signal and multi-body dynamics model are combined to realize the force extraction of key components of Mc Pherson suspension and steering system.Establish a multi-body dynamics model of the mining truck and verify its rationality.Combined with the collected road excitation signals,the dynamic analysis of the whole vehicle is carried out,the suspension system needs to be optimized,and the boundary loads of key components are obtained.(4)The finite element model of the Mc Pherson suspension and steering system of the mining truck was built around the strength of the key components of the Mc Pherson suspension and steering system of the mining truck.Through finite element analysis,the strength characteristics of key suspension components under three typical working conditions are obtained.Based on suspension kinematics optimization and finite element analysis results,optimize the design of steering knuckle arm and center rocker arm.