Optimization Design And Experiment Study Of Wheel Vibration Damping System With Hub Motor

With the continuous rise of international oil prices,the cost of traditional internal combustion engine vehicles is also higher and higher.At the same time,in the context of China's efforts to promote the "resource-saving and environment-friendly" society,electric vehicles are favored by more and more automobile companies and consumers.Electric wheel-drive vehicles are highly valued by universities and enterprises because of their unique advantages such as simple transmission system,high utilization rate of interior space and convenient operation.Although the high degree of integration of drive,transmission and braking systems into the wheel has brought great benefits,problems such as tight space distribution in the wheel are inevitable,which not only makes the efforts of automotive engineers to reduce unsprung mass in vain.The increase of unsprung mass will worsen the dynamic load of the wheel,affect the earthing property of the wheel,and do harm to the driving safety of the vehicle.The increase of unsprung mass to sprung mass ratio will also increase the acceleration of the vehicle body in the sensitive frequency section of human body,which will not only affect the ride comfort of passengers,but also do harm to the health of passengers for a long time.And the motor is placed in the tire,which means that the motor will be in a bad working environment for a long time,which also has a great negative effect on the working stability and service life of the motor.This paper makes an in-depth study of the above problems,and the main research contents and innovation points are as follows:First of all,through the establishment of 1/4 dynamic models of centralized and distributed driving vehicles and the use of Matlab/Simulink software for simulation,it is proved that the increase of unsprung mass is the main reason for the deterioration of vehicle smoothness.Then,a new type of electric wheel structure with a new suspension system and shock absorber is designed on the basis of predecessors,and the corresponding simulation model is established.In order to determine the key parameters of the new suspension system and shock absorber,particle swarm optimization(pso)algorithm based on natural selection was used to optimize and match the parameters,simulation analysis is also carried out.The simulation results show that the new type of electric wheel structure can effectively improve the vehicle ride comfort and improve the vehicle safety and passenger ride comfort.Finally,based on the new electric wheel structure mentioned above,the experimental prototype was studied and manufactured.It was installed on the right rear wheel of a certain model,and pulse experiments were conducted with the left rear wheel under the same conditions,the experimental results of the two kinds of wheels are compared and analyzed,and the experiment proves the feasibility and effectiveness of the new electric wheel structure.