Development of Crankshaft Torsional Vibration Calculation Program for ICE Unsteady Condition

The driving torque that acted on the crankshaft was not periodic under unsteady condition,so the algorithm that was used to calculate crankshaft torsional vibration of steady condition was not feasible.Based on the TVCA software and the torsional vibration database,the crankshaft torsional vibration calculation program of unsteady condition was developed and testified with the typical calculation method of nonperiodic driving torque.