Finite Element Analysis Of Electric Bus Frame And Lightweight Design

In recent years in the face of the worldwide problem of the energy crisis, the scientists developed a new passenger buses which using vehicle power supply to power and drive with motor, called electric buses. Electric buses with traditional passenger cars compared to the most prominent advantage is the use of electrical energy which a renewable energy as a power source to ease the pressure brought by the oil shortage, meantime electric bus in the process of moving, the environment caused by pollution is very small.As we all know, in the traditional passenger cars, the more heaver, the more fuel consumed, the same for electric passenger bus, the heavier the vehicle, the greater the power consumed. With a certain battery capacity, odometer will be shortened. Electric bus, the weight of the frame accounted for the proportion of the total weight, if you can reduce the weight of the frame, electric bus Mileage will be raised. Finite element of electric bus frame static and dynamic analysis in this study, calculation results show that the frame has a larger space-optimized, and its lightweight design.Electric bus frame for the study, the first to use3D graphics software UG to build the geometric modeling; generates geometric model import Hypermesh to pre-treatment, treatment includes:model geometry cleanup, grid divided, material properties given, conditions related to force and boundary conditions applied; finite element pre-processing model will generated and imported into Nastran solver, according to the driving conditions of the set on the frame of the static stress computing and dynamic unconstrained free modal calculated. Static calculation include:the stress conditions of full load bending calculations, the stress conditions of full load reversed calculation, the stress calculations of braking conditions calculations, the stress conditions of full load sharp turning calculation; The calculated results import into Hyperview observation and analysis, can be seen from the results obtained, the frame has a large optimization space; Finally use Optistruct treat the volume of the frame as the objective function, the strength as the constraints, the thickness of each beam as design variables, and take frame on lightweight design.The final results show that the frame of the electric bus after a lightweight design, not only in the static and dynamic performance still meet the requirements, and the mass reduced, achieved a good lightweight result.