Study On Torsional Rigidity Of Crankshaft Based On ANSYS

In recent years, with the development of internal combustion engines, and the continuous improvement of strengthen indicators, the working conditions of the crankshaft has become even worse. In order to meet the development requirements of internal combustion engines, ensure the security and stability of internal combustion engines, design and calculation of the crankshaft needs further research. Especially in the design and development of multi-cylinder internal combustion engine unit, the calculation of torsional vibration characteristics becomes an essential element. Torsional vibration of torsional stiffness as an important parameter in the calculation, the strike has seriously affected the accuracy of the design and manufacture of precision crankshaft, especially has a great impact to determine the parameters for the optimization design process.To an inline six-cylinder marine diesel engine crankshaft, for example, using ANSYS investigated the stress and the distortion of crankshaft's single crank,free end,flywheel and the whole crankshaft, be compared with the computed result of theoretical formula, found that the traditional formula meet the accuracy requirements when calculated the torsion stiffness of the unit crank, but there was a larger deviation In the calculation of complex structures such as the stepped segment shaft, thereby affecting the precision of torsional stiffness of the overall crankshaft. In this paper, based on extensive literature, comparison of several method the most commonly used at this stage for the torsional stiffness of the steps shafts, found that simultaneous equation method has simple, accurate, easy to parameter optimization, etc., when calculated torsional stiffness of the stepped shaft section, which provide reference about the optimal design for the diesel engine and crankshaft torsional vibration analysis.