Analyze The K&C Characteristics Of A Car Suspension And The Vehicle Handling Stability

The handling stability of the car directly affects the driving safety of the car.It has been used as one of the indicators to evaluate the performance of the car,and the chassis system of the car determines the handling stability.Suspension is an important part of the chassis of a car.The performance of the suspension will directly affect the handling stability of the car.In this thesis,the K & C characteristics of the front and rear suspension and the handling stability of the whole car are analyzed and studied with a certain car as the research object.The main research contents are as follows:Based on the hard-point parameters measured by the vehicle's three-dimensional structural model and the elastic element properties measured experimentally,a rigid-flexible coupling model of the vehicle's front and rear suspension systems and a rigid-body model,a steering system model,and rigid-flexible front and rear stabilizer bars were established based on ADAMS/car.Coupling model with rigid body model,tire system model,body system model,brake system model.The rigid-flexible coupling model and rigid body model of the front and rear suspensions were subjected to two-wheel parallel wheel jump kinematics and lateral force co-loaded elastic kinematics simulation and real vehicle experimental analysis.The toe angle,camber angle,and suspension were analyzed.Variations of suspension performance parameters such as stiffness and roll center during vehicle movement.Suspension performance parameters all changed within a reasonable range.The simulation results of the rigid-flexible coupling model more closely matched the experimental results of the real vehicle,which provided a basis for the design and development of the suspension of subsequent models.Aiming at the small error of experiment and simulation results in the elastic kinematics analysis,based on the response surface analysis method,the main performance parameters of front rigid flexible coupling suspension model are optimized with the stiffness of front suspension bush as the design variable and the toe and camber angle as the objective function.After comparing and analyzing the simulation results before and after optimization,the error of experiment and simulation results of the two main performance parameters is smaller The K&C performance of the suspension is improved,which shows that the stiffness of the bushing is the main factor affecting the elastic kinematic characteristics of the suspension.According to the optimization model,a rigid-flexible coupling dynamics model of the vehicle is established.According to the national standards for vehicle stability experiments,steering wheel angle pulses,steering wheel angle steps,serpentine,steady-state turning,steering portability,and Low-speed and high-speed turn-back simulation tests;and according to the corresponding evaluation standards,the results of various steering stability simulations are evaluated and scored to obtain a comprehensive score of vehicle handling stability.