Impact On The Vehicle Ride Comfort Caused By The Changes Of Electric Vehicle Unsprung Mass

With the development of society and the continuous improvement of people's life, automobiles are becoming a tool of transportation. A good auto product should be an artwork. At the same time, people have a higher demand for transportation comfort. To ensure the safety, high efficiency and comfort of traffic and transportation, automobile ride comfort is getting more and more important .Automobile ride comfort is one of the most important performances of automobiles. Many automobiles companies are researching the automobile ride comfort and improving it to enhance the competitive power of their own automobiles. Therefore, the analysis of Vehicle ride comfort, has become a very important task.Electric vehicles is better than traditional vehicle in energy saving, environmental protection, and performance, it is the product of common role by the socio-economic benefits, energy and environmental protection. Electric vehicle has already become the new energy vehicle developmental mainstream which is recognized by the world. And using electric wheel drive system on electric which can reduce vehicle quality improve the performance and reduce the costs of vehicle is a feasibility technology. However, due to the introduction of Motor Wheel and the increasing of non-hoisting quality, the vehicle performance is greatly changed. Therefore, combining with the development of a new generation of domestic electric vehicle, this dissertation studies the simulation and analysis of vehicle ride.The whole dissertation includes five chapters:In chapter one, this dissertation review on the development of electric vehicles, and introduce the background and significance of this article. The summarization about this article is done.In chapter two, the knowledge, methodology and factors about Vehicle Ride Comfort is summed up in this dissertation, the weighted rms value of the acceleration method to evaluate Vehicle Ride Comfort is used.In chapter three, based on the software ADAMS/Car, this dissertation established a electric vehicle model. Model includes the front and rear suspensions system, the tire system, the rigid body system and the steering system. Through simulation, this dissertation tunes the stiffness of the front and rear suspensions system to meet the needs of Vehicle Ride Comfort simulation.In chapter four, based on the software ADAMS/Car Ride, this dissertation generates road spectrum document. The Vehicle Ride Comfort simulation of electric vehicle with different unsprung mass is done. Through comparison and analysis, the impact of unsprung mass on the Vehicle Ride Comfort is summed up.In chapter five, this dissertation describes the main results of the studies. Through this study, the Vehicle Ride Comfort of electric vehicles degrades with the increase of unsprung mass. The low-frequency vertical vibration acceleration of electric vehicles heart significantly increases with the increase of unsprung mass.Consequently, the vertical performance of electric vehicles with wheel-drive has been greatly changed. Therefore, in the development process of electric vehicle with wheel-drive, it should be to minimize the unsprung mass or use relatively small wheel motor.