Simulation Study Of Powertrain Mounting System Transient Response

Powertrain mounting system is the automotive vibration isolation system, goodperformance of the powertrain mounting system will not only reduce the vibration to thetransmission of the frame to reduce interior noise and improve comfort, but also moregood to protect the powertrain, so transient response of the vehicle powertrain mountingsystem with speed of change is particularly important.In this paper, a four-drive the UTV powertrain mounting system as the researchobject, using ANSA software to establish the dynamometer and vehicle powertrainmounting system finite element model. Analyzed transient response of frame andpowertrain mounting system, and compared with multi body dynamics calculationresults to verify the accuracy of finite element model of the powertrain mounting system,and found that mount bracket have stiffness problem, then to improve research.Analyzed transient response of the vehicle powertrain mounting system, and comparedwith transient response of bench model to sum up considering the elastic body effect ontransient response of powertrain mounting system. In order to improve calculationefficiency of transient response of the vehicle powertrain mounting system, simplifiedmodel of vehicle are discussed.The main research content and results are summarized as follows:①By analyzing the kinematics and dynamics of the crank and connecting rodmechanism,derived the force of engine block: reciprocating inertia force andoverturning moment. MATLBA is used to calculate the engine load curve, according tothe1-3-2outbreak sequence is applied to engine.②Established a simplified finite element model of the powertrain, and completedfinite element model of the bench of powertrain mount system. Analyzed transientresponse of powertrain mounting system of the bench, and compared with multi-bodydynamics simulation results, showed results agree well, to verify accuracy of thepowertrain mounting system finite element model.③In high speed zone, response results of the mounting system transient showeddue to the lack stiffness of mounting bracket rigidity caused acceleration peak, so usingmodal analysis method on the mounting bracket for analysis and strengthening design,by comparing before and after stent to strengthen in the bench models in transientresponse, tested the effectiveness of the stent improved. ④Established finite element model of vehicle powertrain mounting system, andanalyzed it’s transient response. Compared with a bench power assembly mountingsystem transient response results to sum up the elastic vehicle effect on transientresponse of powertrain mounting system.⑤As for the whole vehicle model is too complex, so it is not conducive to studytransient response of the vehicle powertrain mounting system. using modal analysismethod and vehicle powertrain mounting system transient response of vehicle modelsimplification are discussed and validated, although the computational efficiency is onetimes closer, but the result error, describe a simplified vehicle finite element model ofcertain problems still exist.