Finite element analysis for engine crankshaft torsional stiffness Online publication date: Tue, 12-Nov-2019
by Rang-Lin Fan; Chu-Yuan Zhang; Fang Yin; Cheng-Cheng Feng; Zhen-Dong Ma; Hua-Bing Gong
International Journal of Simulation and Process Modelling (IJSPM), Vol. 14, No. 4, 2019
Abstract: Accurate crankshaft torsional stiffness is important to build the lumped parameter model (LPM) for crankshaft torsional vibration analysis. For the crankshaft system of a four-cylinder in-line gasoline engine, a procedure to build the finite element model (FEM) is presented. And the applicability of two ways to set the equivalent mass or equivalent moment of inertia for piston-rod in FEM is declared. When building a lumped parameter model, the concept of rigid-rotation of the crank pin central section around the central line of the crankshaft is proposed, and a method to obtain the torsional angle of the central section is declared. What is more, three post-processing methods are presented to obtain the torsional stiffness coefficients. According to three load cases of no-load, half load and full load, the tests are carried out. The simulation results of FEM and LPM, and the test results have good agreement with each other.
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