Lightweight Improvement Design Of Electric Heavy Truck Frame

With the shortage of energy resources and the intensification of environmental pollution,the emission pollution problem of automobiles is getting more and more attention from all walks of life,and the lightweight of automobiles can significantly reduce the emission pollution of automobiles and reduce energy loss,so the lightweight of automobiles is gradually entering the vision of major automobile companies.The application of heavy commercial vehicles in our life is becoming more and more extensive,and their transportation volume has occupied more than 60% of the domestic freight volume,their own large size,single material application,and large mass,so the lightweight of heavy commercial vehicles has been a necessary thing to do.In recent years,computer simulation design and analysis technology has also been gradually applied to the field of special vehicle design,and the use of computer simulation design and analysis technology for heavy commercial vehicle lightweight can improve the design efficiency.The paper takes a pure electric heavy truck frame as the research object,establishes the finite element model of the frame,analyzes the static and dynamic performance of the frame,and obtains the free modal,stiffness,strength and other performance parameters of the frame.It is found that the first-order torsion frequency of the frame is in the range of road excitation,which is easy to cause resonance.The stiffness of the frame under the torsion condition does not meet the requirements of the same type of frame,and the torsion stiffness is small,which may affect the service life of the whole electric heavy truck,so it is necessary to optimize the design of this frame.The longitudinal beam is the main load-bearing part of the frame and occupies most of the weight of the frame.Therefore,the longitudinal beam structure with "C" section of the traditional structure of the frame is designed.The bamboo has high torsional stiffness in nature,and we found that the reason for the high torsional stiffness of bamboo is its closed hollow section structure.The cross section of the frame is changed from the traditional "C" section to the closed section.Analyzed and discussed the influence of the longitudinal beam section size on the frame performance,and compared the mechanical performance of the frame after the preliminary improvement design with the prototype frame.Finally,the paper optimized the dimensions of the longitudinal and crossbeams of the frame with the thickness of the longitudinal and crossbeams as the design variables,selected the mass as the objective function and the maximum displacement at the loading point and the first-order intrinsic frequency as the constraints.Obtain the final thickness parameters of the longitudinal and crossbeams of the frame.By comparing the weight and performance parameters of the front and rear frame of the optimized design,it can be seen that while the frame performance is improved,the weight is reduced by 27.60%.It can be seen that the optimization effect is good.