Study On The Ride Comfort Of Battery Rear-mounted Electric Vehicle Based On Sensitivity Analysis

With the public attaching more and more importance to environmental problems and the energy crisis becoming more and more severe,people focus their attention on the means of transportation closely related to daily travel,experts and scholars generally believe that the traditional fuel automobile is one of the main culprits of air pollution.Replacing oil-fueled vehicle with electric vehicle could solve these thorny problems,through national policy support and continuous research and development of automobile enterprises in technology,the pure electric vehicle market is unprecedentedly hot,people are more inclined to buy pure electric vehicles as a means of transportation.At the same time,they also hope that pure electric vehicles can have a good ride,so that drivers and passengers can have a comfortable ride experience,and the cargo can be kept intact.Only by making the designed pure electric vehicle more in line with the market demand can we have a broader market prospect.In this paper,based on multi-body dynamics theory,the rigid-flexible coupling vehicle model with the steering tie rod of the front suspension as the flexible body is established by using the dynamics simulation software ADAMS/Car.According to the requirements in GB/t4970-2009,on the established b-class road surface,the vehicles comfort under medium-high speed steering condition was analyzed,The simulation results of rigid-flexible coupling vehicle model and rigid body vehicle model were compared and analyzed,it is proved that the rigid-flexible coupling model with the steering tie rod as the flexible body can reflect the vehicle comfort more accurately.Then,according to the requirements in GB/ t6323-2014,the rigid-flexible coupling vehicle model with the steering tie rod of the front suspension as a flexible body and the rigid-body vehicle model as a flexible body were compared and analyzed respectively for vehicle handling stability,It is concluded that the design of the steering tie rod of the front suspension as a flexible body has little effect on the stability of vehicle handling.Finally,the sensitivity analysis and multi-objective optimization were carried out for the shape and location of the battery pack,compared with the vehicle comfort simulation results before and after optimization,the optimized battery pack shape and installation location parameters improved the vehicles comfort of the model.