Finite Element Analysis And Improvement Of Frame Structure On XX6860GE City Bus

As one of the main carriers of urban transportation,passenger cars play a very important role.According to the nature of the functions,buses can be divided into tourist buses,passenger buses,group buses,special school buses,urban buses,and urban and rural buses.The frame is a component that provides effective support for the whole vehicle.Under the condition of ensuring the safety and stability of the vehicle,all the components of each assembly are connected to the frame and bear the load from various aspects,which requires the frame.The load capacity is large enough.At this stage,with the development of the automobile industry,the safety and smooth running of passenger cars are increasingly valued by experts and scholars.Since the frame is the main part of the load in the car,the bearing capacity of the frame directly affects the whole vehicle.Bearing capacity and life,so the check of the strength and rigidity of the frame becomes more important(1)Establish the ANSYS finite element model of the target bus frame structure.Taking the XX6860 GE city bus as the research object,the finite element model of the frame structure is established.According to the drawings provided by the manufacturer,the three-dimensional geometric model of the passenger car frame is established in the 3D simulation software CATIA.(2)Static strength analysis of the target bus frame structure.According to the static condition of the passenger car in the actual process and the driving condition under the driving state,it is simplified into four typical working conditions: starting condition,braking condition,bending condition and torsion condition,and the strength of the frame structure is detailed.And the calculation and analysis of the stiffness,the stress and deformation of the frame structure under these working conditions are obtained,and the corresponding evaluation is made,which also provides the direction for the later improvement.(3)Random vibration fatigue simulation based on the frame structure of the target bus.In order to obtain the fatigue life value of the vehicle frame,the modal analysis of the first 20 natural frequencies and vibration modes of the frame structure is required.The analysis can provide data for subsequent analysis of the frame and avoiding resonance.The modal analysis method can be used to analyze the stress distribution,displacement amplitude and displacement,velocity and acceleration of the frame at the maximum amplitude of the frame through data analysis under the condition of random vibration of the frame.The dynamic characteristics of the frame;using the calculation result data,according to the Gaussian three-interval method and the Miner linear fatigue cumulative damage law,calculate the fatigue life value of the frame under the random vibration of the road surface,and obtain the fatigue life value of the vehicle frame.(4)Improvement of the frame structure based on the static strength calculation of the target passenger car.On the basis of the above static strength analysis,the analysis and calculation results show that under the premise that the static strength meets the working conditions,the frame structure and the part arrangement are partially modified,and the vibration displacement is made on the basis of ensuring the strength and rigidity.Reasonable distribution on the rack can also reduce the weight of the frame and optimize the performance of the vehicle.Based on the daily practical work,this thesis takes the market research and investigation as a sample,and combines the finite element method with the actual research of the frame structure to improve the static and dynamic performance of the frame.In this paper,the XX6860 GE passenger car frame is taken as the research object,and the performance of the product market is taken as a clue.The performance of the car frame is studied through simulation analysis.According to the dynamic performance and fatigue life requirements of the passenger car,the frame is static.Modal and fatigue analysis,find out the fatigue position and dangerous point of the frame of the vehicle through simulation analysis;calculate the time of occurrence of the dangerous point by random vibration and fatigue analysis of the dangerous point;then the dangerous point and mechanics The structure of the frame with poor performance is improved,and the mechanical properties of the dangerous point are improved.Then,the reliability of the improved frame and the whole vehicle is verified by the test,and no problem is obtained through the test,thereby improving the product quality and creating benefits for the enterprise.