Optimization Of Macpherson Suspension Kinematic Performance Of A Mini-car And Analysis Of Handling Stability Of The Vehicle

With the rising possession quantity of automobile and strengthening construction of highway traffic,as well as the improving designed speed of the vehicle,automobile safety problems is getting more and more critic.Handling stability is one of the most basic and most important performance of a whole vehicle,has a decisive influence on the vehicle safety travel.The suspension system is the core content of the vehicle design and chassis development,and how well its performance is has a direct affect on the handling stability during the vehicle driving.In recent years,domestic mini-car occupies a pivotal position in the whole automobile market,which is result of the improvement of self-developed technology of national car brand,and the development of automotive lightweight and miniaturization.Under the circumstance that safety laws and regulations of mini-car need to be developed,the development of the suspension system with good performance and improving handling stability,is not only the premise to guarantee the safe travel of micro-car safety,but also the important means to maintaining the competitiveness of mini-car in the whole automobile market.This thesis mainly discusses an mini-car which is Front engine Rear wheel drive,in the view of influence of suspension kinematic properties on the vehicle handling stability,based on the theory of multi-body dynamics,using the virtual prototype simulation software ADAMS/Car module to establish the front McPherson suspension kinematics model of the mini-car,using the parallel wheel travel to simulate the wheel vibration in the process of car driving in the actual road,the change rule of the performance parameters of suspension system is analyzed.Combined with sensitivity analysis and experimental design methods,designed a multi-objective optimization experiment for wheel alignment parameters,and statistical analyzed the fitting of optimization objectives with the method of analysis of variance,the result obtained by contrastive analysis shows that the change rule of caster angle and toe angle along with the wheel travel become more reasonable.The powertrain,tires,rear suspension and other subsystem models were established based on ADAMS/Car,the modeling methods and scope of application are discussed in detail in the process of modeling,proposed to build the whole vehicle model that support to analysis a variety of vehicle performance.Finally,built a complete model of vehicle dynamics to analysis the vehicle handling stability in accordance with the test requirements specified in the national standard,achieved the analysis of vehicle handling stability by simulation after the suspension optimized.Focused on the virtual prototype technology,support the in-depth research on the handling stability and active safety of mini-car with the process of modeling and simulation,realize the analysis of influence of suspension structure on the vehicle handling stability,help to develop the suspension system applicable to mini-car with good performance,and provide the theoretical basis for the establishment of multi-vehicle performance analysis model.