Handling Stability And Ride Comfort Analysis And Optimization Of Mining Dump Truck

With the development of national economy increased demand for energy and minerals,the demands for mining dump truck are increasing;mining dump truck is classified as State Congress in key areas of major technical equipment,mining dump truck for the performance of proposed higher requirements.Dynamics performance as the main performance of the truck,have a great impact on the vehicle driving safety,vehicle structural life and ride comfort.Therefore,the researches to the dynamics performance of mining dump truck in line with national policy requirements,to enhance the major equipment manufacturing level,and to ensure the normal national energy and mineral mining,has important economic and engineering application value.According to mining dump truck's unique characteristics and working environment,this paper aims to study characteristic of mining dump truck suspension system,characteristic of stabilizer bar,handling stability and ride comfort of these aspects of the work,to improve the kinetics of dump truck performance to provide reliable theoretical basis and research tools.To this end,analized the 3D flow field of a hydro-pneumatic suspension of domestic mining dump truck for the first time,and obtained their exact stiffness and damping characteristics;established a large-scale mining dump truck flexible coupling dynamics model to improve the accuracy of analysis for the first time;designed a new variable length with nonlinear stiffness anti-roll bar;conducted a ride on the truck test analysis and scoring methods research;According to the handling stability and ride comfort for the suspension system has the characteristics of different requirements,established a dump truck ride and handling stability collaborative optimization model,the collaborative optimization model is optimized using genetic algorithms.Content of this study are as follows:1.Nonlinear characteristics analysis of hydro-pneumatic suspension based on the two-phase flow and dynamic mesh.Mining dump truck use four single-chamber hydro-pneumatic suspension,its main feature is both nonlinear stiffness and damping characteristics,and the suspension structure is very large,suspension bear the load is very large,the current domestic test equipment,can not do the experimental analysis of its characteristics.Based on the coupling characteristics of nitrogen and hydraulic oil of hydro-pneumatic suspension,the dynamic mesh and VOF model was integrated,simulated the three-dimensional dynamics characteristic of hydro-pneumatic suspension of dump truck,which suspension internal flow field clearly visible and thus obtain precise suspension stiffness and damping characteristics,provide the basis for the hadling stability and ride comfort simulation analysis.2.A domestic mining dump truck flexible coupling dynamics model is built.Due to the dump truck frame structure,size and quality is very large,the modal characteristics of the main frame impact vehicle dynamics performance very large.In order to analyze and optimize the vehicle performance accuratly,this paper established the dump truck main frame finite element model in Hypermesh software,and established a frame hinge point related to each constraints,during the modal analysis,and then import the vehicle multi-body dynamics model,the formation of flexible coupling vehicle dynamics model.3.Handling stability analysis based on a new anti-roll bar.For the special working conditions,the kinematics characteristic of front and rear axles and the roll characteristic were analyzed,the results shows that the current structure will lead to vehicle motion asymmetry and bias tire wear phenomenon.To solve this problem,a stiffness variable and length variable anti-roll bar was invented,the new anti-roll bar can solve uncoordinated movement phenomenon,and have the nonlinear stiffness characteristics,its stiffness increases as the vehicle roll angle and increases,the anti-roll performance of the truck can be improved.Using the new stabilizer bar,completly analyzed and evaluated vehicle handling and stability of the mining dump truck by multi-body system dynamics model.4.Ride comfort analysis based on the vehicle drive test and new anti-roll bar.Due to the very poor road conditions and vehicle carrying capacity of mining dump truck,pilot work continuously for a long time of the drivers,so the vehicle ride comfort is very important to the reliability of the vehicle structure,have an important impact on traffic safety.This article refers to IS02631 standards,national standards GB/T4970-1996 "car ride with random input test methods" and QC/T76.8-1993 "dump truck ride comfort test methods ",did the ride comfort test of the truck in an open pit mine.According to the mine road environment,built Class E road surface spectrum according to the ISO standard,using the new anti-roll bar,simulated the ride comfort of the truck,and designed a new impulse test blocks for mining dump truck.5.Collaborative optimization to handling stability and ride comfort of the mining dump truck.According to automotive design experience,to be a better ride,vehicle suspension stiffness should be relatively smaller,but to be a better handling and stability,the suspension stiffness should be compared with the larger.Based on the characteristics of the dump truck,the suspension stiffness and damping,the stiffness of the anti-roll bar,and suspension mounting location were defined as the design variables,handling stability and ride comfort were defined as integrated objectives,the collaborative optimization method is introduced vehicle dynamics analysis,manipulating mining dump truck stability and ride comfort for a collaborative optimization,both the two aspects of performance were improved.In summary,this paper researched the hydro-pneumatic suspension,handling stability and ride comfort of the mining dump truck,and designed a new anti-roll bar for the truck,provided new ideas and methods to mining dump truck for the performance analysis and optimization.