Finite Element Analysis And Optimization Of A Heavy Truck Frame

In this study, the static and dynamic analysis were performed to a truckframe which was destroyed in the actual use process, using ANSYS FEAsoftware. The primary cause of frame destruction was found by analysis of theframe. Then improvement projects were proposed, also the optimization wascarried out and has validated the feasibility of improvement projecte. The mainconclusions are as follows:Establish the finite element model of the frame and the balance suspension.According to the structure characteristics of frame, the model of the frame wasestablished by applying shell element. By using COMBIN14 and MPC184element and applying node coupling means simulated the joint of the balancesuspension and the frame. At present, the report about the simulation of balancesuspension is few.By the frame static analysis under each kind of operating mode, obtainedfour big stress areas which were accordant to these regions that had destructed inthe actual use process. Carried on the dynamic analysis to the frame to obtainthe frequency and mode shape and also calculated the stress and displacementresponds of the frame under road surface and engine drive, had a conclusion thatthe stress responds value of big stress point is large under outside drive.Based on the prime reasons of the frame destruction, improvement projectswere proposed. Through carried on the analysis and contrast to various plans,obtained that V pipe cross-member is better than U pipe cross-member; Theforth cross-member that joined with web plate can reduce the stress value of joined area; The corner joined plate is more reasonable than web plate structure.These improvement projects not only reduced the stress value, but also providedthe theory basis for the similar product design.Firstly, the component of the frame was optimized by using Sub-Problemmethod in ANSYS, and then the entire flame was optimized, after then, theweight of frame was decreased 10.43% (0.22t).We carried on the static and dynamic field test. The accordance with the testresult and the calculate result has validated the feasibility of the modal of theframe, boundary condition and simulation method.In the frame general computation, does not consider the enhancementfunction of the freight platform. Through comparison the stress value of whethercondiering the influence the freight platform, obtained that regarding thedifferent spot on the frame, the freight platform to its stress contribution is alsodifferent (many is 30%, equally is 29.8%). In the preliminary design canconsider that the contribution of freight platform to the frame is 30% which hasprovided the reference for other vehicle frame design.The submodel technology was introduced to the frame analysis and appliedto analyse the local of frame-equilibrator part. Comparing to the test result,indicated that using the submodel technology can obtain more precise result.This method has provided the new mentality for the frame partial scrutiny.