The paper considers two kinds of crankshaft dynamic models which can be used to analyze cranktrain dynamics: structured model, consisting of mass nodes connected by binary elastic elements — for 3D dynamic simulation, and equivalent torsional model — for torsional vibration analysis. A methodology of automatic generation of both models, sharing the same data in form of CAD model, is presented. The dynamic equivalence of both models is demonstrated, and their correlation with the original volumetric FE model is discussed. The main advantage of the method is a significant reduction of effort to generate the structured and torsional models.

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