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Taking into account construction parameters of crankshaft when evaluating characteristics of its equivalent torsion scheme

The article is devoted to determinе the parameters of the equivalent torsional scheme of the crankshaft of automotive internal combustion engines. The parameters that depend on the design features of the studied engines include the number and moments of inertia of the motor masses, the stiffness of the shaft sections and their length. Currently used methods are based on empirical data and require their identification for each specific model of the engine under study. To improve the adequacy of the data obtained, it is necessary to conduct fullscale tests of the crankshafts for stiffness. Modeling the spatial structure of the crankshaft by finite elements with further determination of the studied parameters, although it facilitates the task, requires subsequent mandatory verification of the model used. To unify the calculation methods and reduce their complexity, it is proposed to consider the elastic-deformable section of the crankshaft, taking into account the geometric parameters. The accuracy of the results obtained depends on the curve equations describing the elastic deformation surface of the crankshaft transition sections. A preliminary evaluation of the crankshaft parameters can be performed on a piecewise linear surface. Reducing the sampling step increases the accuracy of the results. In the same way, we can take into account such design parameters of the crankshaft as the overlap of the necks, the presence of cavities inside the main and connecting rod necks. The proposed method can be used for automate crankshaft calculations of modern automotive internal combustion engines.