Finite Element Analysis And Lightweight Design Of Barn Semitrailer Frame

The economic development has promoted the development of China's road industry,and further promoted the development of the transport industry,which mainly includes air transport,railway transport and road transport.Among the three major transport industries,highway transportation has the largest share.Semi-trailer,as an important carrier of highway transportation industry,plays an important role in promoting economic development by optimizing the design of semi-trailer and promoting the maximization of highway transportation efficiency.In recent years,with the implementation of national automobile emission standards,China's heavy truck industry has developed rapidly.China's heavy truck industry has always been the design concept of more than less,as the name implies,under the premise of guaranteeing the cost of automobile manufacturing,more materials are used to guarantee the performance of the supporting parts of trucks.Therefore,the heavy truck in the early stage of our country appears to be relatively heavy.With the lack of resources,major automobile manufacturers have paid attention to the important role of semi-trailer lightweight in market competition.The finite element method has been gradually applied to the optimization design of semi-trailer in large automobile factories,which ensures the maximum utilization of resources.From the enterprise point of view,this paper carries out lightweight design of semi-trailer.Firstly,the existing semi-trailer is modeled according to the relevant drawings,and then the semi-trailer is simplified and meshed according to the theoretical basis of finite element analysis,which lays a foundation for the finite element analysis later.Firstly,the static analysis of semi-trailer is carried out.Four typical working conditions of semi-trailer are selected,including bending condition,torsion condition,emergency braking condition and turning condition.The frame and warehouse parts of semi-trailer under four working conditions are analyzed.The analysis results show that stress concentration exists in part of semi-trailer under four working conditions.Local safety factor is high,material utilization rate is low,and there is space for lightweight.The first 16 modes and frequencies of semi-trailer are extracted from the modal analysis of semi-trailer,and the vibration conditions of each frequency of semi-trailer are determined,which provides a dynamic theoretical basis for the optimization of semi-trailer in the following chapters.According to the results of the analysis,the semi-trailer is designed lightly,including the optimization design of the semi-trailer's barn beam with insufficient strength.OptiStruct is used to optimize the size of the semi-trailer.After determining the mathematical model of the size optimization,the optimum size table of the main parts of the semi-trailer is calculated.After that,the strength of the optimized semi-trailer is calibrated and the lightweight research is carried out,which effectively reduces the semi-trailer by half.The complete quality of trailers.