| The increasing number of traditional cars has brought many benefits to people's daily life,but it has also caused increasingly serious environmental pollution problems.With the reduction of oil resources year by year,traditional cars fuelled by gasoline and oil have exacerbated resource constraints.At the same time,the city's road conditions have become more complex,and traditional cars have not been able to meet people's requirements for convenient travel.This new kind of automobile comes into being-distributed drive electric vehicle,which occupies the absolute advantage in such aspects as maneuverability,energy conservation and stability.The research on it has received the attention of enterprises and related research institutions.Through extens ive promotion,it can effectively solve the problems of environmental pollution and resource shortage,and contribute to the rational use of the natural environment and the sustainable development of human society.Distributed driven electric vehicles are powered by vehicle-mounted power sources,eliminating the need for intermediate transmission components,simplifying the vehicle structure,reducing the quality of the vehicle,and driving the wheels directly through the motor.Due to the more and more diversified motion forms of distributed driven electric vehicles,the chassis structure of traditional automobiles has gradually failed to meet the actual needs,so it is necessary to redesign the chassis of electric vehicles.In this paper,according to the current trend of intelligent electric vehicles,the distributed drive electric vehicle chassis is studied and the chassis transmission structure is optimized.First of all,in the structure design to meet the chassis requirements of distributed drive electric vehicles,such as straight,crab,in situ steering and other conditions;Then,the dynamic simulation model of multi-rigid body of the vehicle is established,and the dynamic simulation analysis of the vehicles under various typical driving conditions is carried out.The force of the main load bearing components of the chassis transmission system is obtained.Finally,through the finite element analysis,the weak link of the chassis force can be found at the beginning of the design,and the structure can be optimized to provide theoretical basis and technical reference for the subsequent vehicle chassis design and manufacturing physical model.The main research contents of this paper are as follows:(1)The chassis structure of distributed drive electric vehicle is designed.Firstly,the technical parameters of the vehicle are determined by collecting relevant data of the electric vehicle.Then the distributed drive electric vehicle chassis is studied in detail,and a chassis structure that can increase the movement form of electric vehicle is proposed,and the vehicle-mounted quality is arranged reasonably.Then the frame,independent steering mechanism and independent suspension mechanism are designed and modeled respectively.Finally,SOLIDWORKS,a 3d modeling software,is used to design the whole vehicle and establish a model of distributed drive electric vehicle.(2)The vehicle dynamics model is established and simulated.Firstly,the multi-body dynamics simulation software ADAMS is used to establish the vehicle dynamics model.Then the dynamic simulation of the vehicle is carried out under different working conditions.At last,according to the result of simulation,the reason is analyzed.(3)Finite element analysis and optimization design for the main parts of the vehicle.Firstly,finite element analysis software ANSYS is used to build the finite element model of the main parts,including frame flange,shock absorber guide rod,support shaft,lower steering arm and frame.Then the parts are simulated by finite element method.Finally,according to the results obtained,the causes are analyzed,and the structure of the main parts is optimized. |
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