Browse Publications Technical Papers 2020-01-1510

On the Effect of Clutch Dynamic Properties on Noise, Vibration and Harshness Phenomena 2020-01-1510

Noise, vibration and harshness phenomena (NVH) can manifest itself during the engagement and disengagement process of dry friction clutch systems. Such phenomena can have a negative impact on cabin occupants driving experience (as well as others in the immediate vicinity of the vehicle). Typically, unwanted NVH phenomena that pertain to the clutch system include Judder, Chatter, Squeal and Eek. These phenomena are recognised by the quality of the radiated noise, as well as the dynamics occurring during clutch actuation. The aim of the current study is to utilise a numerical clutch system model (fully coupling the main motions of clutch components) to predict clutch dynamics during engagement manoeuvres. The model will be used to assess the effect of various clutch design parameters on mitigating system instability. The clutch model utilises measured coefficient of friction data from a rotary tribometer at representative slip speeds and contact pressures. The paper highlights potential NVH issues and demonstrates the improvement of such unwanted behaviour through varying clutch system dynamic properties. The improved understanding of the parameters that affect the clutch dynamic stability can lead to the reduction of future NVH issues.


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