Noise, vibration and harshness during dry clutch engagement oscillations
Ilias Minas
Nick Morris
Stephanos Theodossiades
Martin O’Mahony
2134/12220328.v1
https://repository.lboro.ac.uk/articles/journal_contribution/Noise_vibration_and_harshness_during_dry_clutch_engagement_oscillations/12220328
Determining the root causes of various Noise, Vibration and Harshness (NVH) phenomena in modern
automotive drivetrains is a critical task for industry, since NVH issues often result in worsened driving
experience. The aim of the current research is to investigate the dynamics during dry clutch engagement
and the associated – often problematic – oscillations. This paper reports the development and partial
validation of numerical models to study dry clutch behaviour. The models are used to investigate the
influence of clutch and throttle actuation on the occurrence of unwanted clutch oscillations. The
dynamic coefficient of friction between the clutch interacting surfaces was measured using a pin-ondisc rig under different slip speed and contact pressure conditions, which are representative of a typical
clutch engagement manoeuvre. The paper highlights the occurrence of instability issues in clutch
dynamics (disc radial mode) as potential generators of aggressive NVH, particularly during two
different clutch pedal actuations. Such analysis has not hitherto been reported in the open literature.
2020-05-01 09:27:54
Uncategorised value
Dry clutch engagement
NVH
Friction
Stability analysis
Mechanical Engineering