Optimization And Simulation Analysis Of FSAE Racing Car’s Controllability And Stability

Controllability and stability is a key indicator to measure the level of design and sports performance of the racing car.For FSAE racing car,good controllability and stability can not only improve the flexibility of the racing car to achieve excellent results in the race,but also ensure that the racing car responds to the driver’s wishes with a precise and quick response to protect the driver’s safety.The dynamic competition in the Chinese university student formula racing competition also tested the controllability and stability of the racing car.Therefore,it is very necessary to study the controllability and stability of FSAE racing car.In order to improve the controllability and stability of FSAE racing car,based on the development and design parameters of the FSAE racing car of Taiyuan University of Technology,the FSAE racing car model was established using the software ADAMS/Car.The front suspension system is designed for multi-objective optimization,and simulation analysis and evaluation of the car’s controllability and stability is carried out.According to the vehicle design parameters of FSAE racing car,the FSAE racing car model is built in ADAMS/Car software in the paper,including front and rear suspension subsystems,steering subsystem,front and rear tire subsystems,brake subsystems,powertrain subsystem,and body subsystem.The parallel wheel travel simulation experiment of the front suspension system was performed.The simulation results were analyzed.It was found that the variation range of the toe angle and the front wheel track is not very large,but the camber angle,the kingpin inclination angle,the caster angle and the height of the suspension roll center are relatively large.After that,the ADAMS/Insight software was used to establish an optimal design experiment.Taking the toe angle,the camber angle,the kingpin inclination angle,the caster angle,the front wheel track and the height of the suspension roll center as the optimal design goals,selecting the inner hard point coordinates of the upper and lower control arm and steering tie rod as the design variables for multi-objective optimization.According to the simulation results for comparative analysis,it can be seen that the range of kinetic characteristic parameters of the optimized suspension is significantly reduced,and the kinetic characteristic of the suspension is improved.According to the optimization results,changing the related hard point coordinates of the front suspension to establish two models before and after optimization.According to the requirements in the national standard GB/T6323-2014,using the event builder module in ADAMS/Car software to compile the driving control file and driving path of the relevant experiment,Through the file driven events module in ADAMS/Car software,four typical controllability and stability simulation experiments are carried out for two types of models,including steady rotation,steering wheel angle step input,snake-like crossing,and steering portability.The experiment results were analyzed,and the vehicle’s controllability and stability of the two models was evaluated according to the requirements in the standard QC/T480-1999 to prove that the controllability and stability of the optimized racing car is improved.