Analysis of torsional crankshaft oscillations in a diesel engine on the basis of cylinder-block vibration

Torsional crankshaft oscillations in the diesel engine of an automobile are studied experimentally. Their relation to the cylinder-block vibration is considered. It is established that the vibrations appearing not only at the resonant harmonic but at higher frequencies are due to torsional crankshaft oscillations, which produce impacts in the crankshaft’s slip bearings.