Fatigue Analysis Of A Light Truck Rear Bridge Based On Virtual Iteration

With the rise of the transport industry,the status of commercial vehicles has been significantly improved.Because of its economy and convenience,it has become an inevitable choice to transport goods.In the whole vehicle,the rear axle is one of the most important parts of the vehicle driving system.It can be said that the rear axle is often not only the main force transmission component of light truck,but also the main load-bearing component.In the truck industry,it can be said that the importance of the drive axle is second only to the engine.However,if the automotive industry wants to make further progress,it must balance the relationship between lightweight and automotive reliability and safety.In fact,there is a contradiction between the two.Fatigue life is the key to reliability.Therefore,fatigue reliability is becoming more and more important in major automobile enterprises.For the analysis of automobile fatigue durability,the traditional method is to test it in real driving environment.According to the feedback of the test,the optimization of the structure is guided,and then the process is repeated until the design requirements are met.This method requires a lot of manpower,material resources and time investment.With the emergence of CAE technology,the traditional fatigue durability analysis has been improved.On the premise of test method,fatigue analysis can be carried out on computer by using computer aided engineering technology and advanced computer algorithm.Compared with the traditional method,this method saves a lot of manpower,material resources and time.In this paper,the virtual iteration fatigue simulation method is used to simulate the fatigue of a commercial vehicle rear axle.Firstly,the multi-body dynamic model of the whole vehicle is built according to the measured parameters.Then,through road test,under specific road conditions,the load spectrum of multiple locations of the vehicle is collected,and the displacement signal of the wheel center is calculated as an iterative objective.Then the shift signal is applied to the multi-body model of the vehicle to obtain the load spectrum of the rear axle.Next,the finite element model of the rear axle is established and the static results of the rear axle under unit load are calculated.Finally,the finite element analysis results,load spectrum and material fatigue characteristic curve of the rear axle are input into the fatigue software to calculate the fatigue of the rear axle.