Gear rattle is a significant contributor to overall noise in low speed, high torque drivelines. This paper describes the development of a gear rattle model of a Harley Davidson motorcycle driveline using Ricardo VALDYN The model was solved in the time domain and included representations of the engine mechanical isolator chain, gearbox and belt drive systems The method used to make high resolution torsional measurements along the driveline is described. These measurements were used to correlate to the predicted displacements. A sensitivity study is described, which used the model to investigate potential counter-measures to reduce the excitation of gear rattle.
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