Dynamic Simulation Of Pure Electric Bus Chassis

Since twenty-first Century, the country is facing the dual pressures of environment and resources. The corresponding policies were introduced in various countries. The development of new energy vehicles was a mainstream direction, while promotion of pure electric bus was becoming a new trend in the city.As the main bearing part of the pure electric bus, the chassis has a direct influence on the ride comfort and ride comfort of the whole vehicle. Therefore, the finite element method is used to analyze the dynamics of the chassis.In the research of the dynamic performance of the pure electric bus chassis, the three-dimensional model of the chassis was established by Creo2.0. ANSYS Workbench was used to establish the finite element model and research the grid division and statics,which includes bending, torsion, emergency braking and turning. The results are analyzed and summarized to find out the strength and stiffness of the component and put forward suggestions for improvement. Secondly, the Lanczos Block method was used to study the structure of the chassis.The natural frequency and vibration mode of the first 6 order were extracted to provide a data base for avoiding resonance.At the same time, the prestressed model of the chassis was studied.For the foundation of harmonic response and random vibration, the frequency and vibration mode of the first 20 steps were extracted. Then, a modal superposition method was used to study the harmonic response of the chassis under the excitation of an electric air compressor. The chassis was determined to withstand the load.From the results of the position of the peak value of the response curve,the frequency of the resonance was near 30 Hz and 50 Hz, which provided data reference for the improvement of structure and avoided resonance. Finally, the power spectrum density function of road surface is generated by using the fast Fourier inverse transform method and the MATLAB_Simulink module. Through the random vibration analysis of the chassis, the Workbench was analyzed and integrated to find out the location of the fatigue and provide important theoretical basis for the structural improvement of the chassis.Through the analysis of the static, mode, harmonic response and random vibration of the pure electric bus chassis, the dynamic characteristics of the chassis were obtained,which is of great significance for improving the ride comfort stability of pure electric buses.