Abstract

Crankshaft torsional vibration characteristics have been studied, more often based on the results of measurement at a pulley, rather than in relation to a pulley. The results of the measurement at a pulley, however, include crankshaft torsion assuming that a crankshaft is elastic, as well as rotational speed changes due to cylinder pressure fluctuation assuming that a crankshaft is rigid. The authors recommend that relative torsional amplitude should be used in evaluating torsional vibration characteristics, rather than torsional amplitude at a pulley.

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