Crankshaft Analysis of Strain Distribution Generated by the Influence of Bending and Torsional Vibration in Operation

One of the main parts of the diesel engine, the crankshaft has the important items related with noise, vibration, and durability. The precise prediction as to these items will be, therefore, useful for understanding the vibration mechanism and for improving these items in an early design stage. This paper describes a new method of predicting these items in operation, by means of several techniques in consideration of the non-linearity in the oil film stiffness and exciting force, applied to the V6 type crankshaft. The accuracy of the simulation is demonstrated by comparing the calculated results with the actual vibration. The visualized simulation results are analytically cleared that the strain at the crank pin fillet is increased by the bending vibration coupled with the torsional vibration