It's a fact, but not always taken into account, the durability of power train components is not only dictated by the crank train excitation forces but can also be influence by the structural component vibration. The objective of the hybrid analysis method presented in this paper is not to consider the dynamic loads as discrete static loads but to calculate the component durability under realistic time dependent operating conditions including the dynamic structural behaviour. The investigation has been performed on the GEVO16 power train of a locomotive. The power train is composed of a V16 diesel engine and a alternator, directly driven by the combustion engine. The dynamic loading of the oil pan and of the integrated front end (IFE) has been simulated and verified using measurements. The hybrid analysis uses the synergy of two widespread analysis types: Multi-Body-Analysis (MBA) and the Finite-Element-Analysis (FEA), to simulate the dynamic component loading but also the assembly and thermo-mechanical loads. The relevant power train components (engine block, oilpan, IFE, crankshaft and alternator housing) are modelled as flexible body, based on modal condensation extracted from FE-models, within the MBA environment. Using this MBA-model several combustion cycles are simulated, in which the flexible bodies of the power train assembly are excited by the gas forces, the piston side forces, the bearing forces and the reaction torque of the alternator. This modelling method enables the interaction between engine block deformation and the excitation forces to be taken into account. Particular attention has been paid also to model the adequate interaction between the individual components of the power train assembly to meet the measured engine vibration behaviour. The component deformation can be extracted from the dynamic MBA-simulation using modal scaling factors and is transferred by means of superposition onto the FE-model. The result is a FE-model containing the 3D stress distribution as function of time. The 3D stress results are used for an in-depth dynamic fatigue analysis in which the amplitude and mean stresses are calculated followed by the fatigue safety factors and/or fatigue life time. To verify the calculated results a comparison between measurement and simulation has been performed. The power train has been equipped with an array of accelerometers on the crankcase and alternator housing and strain gauges on oil pan and IFE. The comparison has shown that a good correlation of both the global deformation as well as the local strains can be achieved.


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    Title :

    Dynamic fatigue analysis of power train components


    Contributors:


    Publication date :

    2007


    Size :

    11 Seiten, 20 Bilder, 12 Quellen


    Type of media :

    Conference paper


    Type of material :

    Storage medium


    Language :

    English




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