Basic Research On An SUV Suspension K&C Characteristics To Ride Comfort

With the popularity of the distributed drive electronic vehicle and thedevelopment of lightweight car body, people are becoming more and more picky tovehicle ride comfort. The popularity of the electronic vehicle leads to moreapplication of wheel drive motor, and in turn, leading to wheel torque fluctuation.This will cause more vibration. In addition, the development of lightweight car bodymay cause the same problem. So many scholars pay more and more attention toresearch on ride comfort.At present, for ride comfort, mainly focused on mechanical characteristics ofspring and damper under the stimulus of the road without taking suspension K&Ccharacteristics into consideration. And at present, research on suspension K&Ccharacteristics mainly focus on vehicle handling stability, this makes the optimizedK&C characteristics is difficult to balance ride comfort requirements.Serves as the project of an SUV, this paper explore suspension K&Ccharacteristics to ride comfort from two parts: modeling and validation wholevehicle, study on the ride comfort evaluation method. This will overcome thecontradiction between vehicle handling stability and ride. At last, this papermentions the optimization idea and method. The details and conclusions are asfollows:Modeling whole vehicle from vehicle performance targets. First of all, we buildvehicle model from structure targets in Adams/Car according to suspensionhardpiont and properties files and validate via the mule SUV K&C characteristicsand field experiment, and then build the vehicle model in VI-CarRealTime fromvehicle performance targets. The establishment of the ride comfort evaluation method applied to this paper.For vehicle ride comfort evaluation, ISO2631currently is widely used, but theevaluation system weakening the transient impact and the driver steering wheelvibration which may affect the driver’s comfort. So we will consider the transientvibration, and the driver’s steering wheel torque fluctuation is introduced into theevaluation method. For the pulse road, we use PTP and RMS values to evaluate thevehicle impact.The influence of suspension K&C on ride comfort. We change the suspensionK&C characteristics and find out the law how different suspension K&Ccharacteristics influence ride comfort with the evaluation method we establishedabove. Through simulation, the results shows: Suspension K&C characteristicsinfluence on vehicle ride comfort is mainly manifested on impulse roads, and Ccharacteristics play a main role, and the Base/Fx in C characteristics influence oncomfort depents on speed, other C characteristics have influence on ride comfortonly when the speed is10km/h.Suspension characteristics optimization. The vehicle is a complex whole, itsride comfort is not only affected by the vehicle internal structure, such as suspensionK&C characteristics, also affected by the external use environment, such as thespeed and road. So in order to improve overall comfort of the vehicle, we mustensure its robustness under the external interference, so we use Taguchi method forvehicle ride comfort and handling stability optimization, in order to meet theperformance requirements.