Analysis Of Ride Comfort And Research Of Lightweight Of Distributed Driven Electric Vehicles

With the development of society and the overall economic strength of the country,a brand-new driving revolution is quietly coming,that is,new energy vehicles.The use of wheel hub motors to drive cars is the main direction for the development of new energy vehicles.As in-wheel motor drives electric vehicles,motors and other components are added to the wheels,causing the unsprung mass of the vehicle to increase,which will inevitably lead to changes in the performance of the vehicle.Therefore,the research on the ride comfort of distributed-driving electric vehicles is conducted through simulation analysis.This paper introduces the application status and research status of wheel hub motors,and understands the evaluation methods of automotive ride comfort.Based on vibration analysis theory and mathematical model,a Simulink model of a hub motor direct drive electric vehicle system is established.Firstly,the 1/4 model was analyzed.By changing its unsprung mass,the body vibration acceleration,tire grounding force,and suspension vibration input force were studied.Then the vehicle model was established.According to the standard-fitting B-type road random excitation model,the effects of different non-spring masses on the vibration acceleration and pitching acceleration of the center of mass of the vehicle body were analyzed.The simulation results proved that the effective control of the unsprung mass was Helps improve the smooth performance of the car.In order to reduce the unsprung mass,on the basis of understanding the topology optimization design ideas and methods,using the variable density method and HyperWorks software,combined with the characteristics of the structure,restraint,force and other characteristics of the stator frame of the hub motor,the modal analysis of the stator bracket was performed.And topology optimization of the structure,and a revised design of the optimized structure.The purpose is to reduce the weight of the stator support as much as possible while satisfying the structural strength,and to check the stiffness of the optimized stator support to ensure the reliability of the optimized stator support structure.