NDLI: Torsional vibrations of wet clutches: influence of mechanical parameters

Content Provider	Springer Nature Link
Author	Ost, Wouter Baets, Patrick Loccufier, Mia Autrève, Stijn
Copyright Year	2009
Abstract	Using a small scale test-rig a number of experiments were performed in which the imposed disk velocity v $_{disk}$, the different mechanical parameters of the test-rig (damping c and tangential stiffness k), and normal load were varied independently.From these experiments it is clear that the mechanism, which gives rise to the occurrence of the oscillations is a mechanism of oscillatory sliding nature. The oscillation frequency is constant and matches the natural frequency of the test-rig.A linear relationship (or linearised) μ(v $_{disk}$) cannot explain the observed oscillations, as a linear μ(v $_{disk}$) relation would produce oscillations with an ever increasing amplitude until v $_{rel,min}$≈0. During the experiments values for v $_{rel,min}$ higher than 0 could be observed. At least the higher order terms of μ(v $_{disk}$) need to be taken into account.The correlation between the slope of μ(v $_{disk}$) and the occurrence of oscillations is however less than perfect. Taking into account the higher order terms of the relation μ(v $_{disk}$) does not change this, as the higher order terms only have an influence on the amplitude of the oscillatory sliding limit cycle.Increased damping causes the oscillatory behaviour to cease. Increasing the stiffness decreases the oscillation amplitude without affecting the shape of the relationship μ(v $_{disk}$). It is unclear whether this is directly caused by the increase in stiffness or by the increase of damping coefficient c associated to the increase of the stiffness.For higher oil temperature the oscillation amplitude is decreased. This is coupled to a shift of the measured μ(v $_{disk}$) curve towards higher velocities as predicted by the Stribeck curve.
Starting Page	341
Ending Page	353
Page Count	13
File Format	PDF
ISSN	00256455
Journal	Meccanica
Volume Number	45
Issue Number	3
e-ISSN	15729648
Language	English
Publisher	Springer Netherlands
Publisher Date	2009-10-18
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Friction Vibration Wet clutch Stiffness Mechanical Engineering Automotive Engineering Civil Engineering Mechanics
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Condensed Matter Physics Mechanical Engineering

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