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Torsional vibrations of wet clutches: influence of mechanical parameters

Wouter Ost (UGent), Patrick De Baets (UGent), Mia Loccufier (UGent) and Stijn Van Autrève (UGent)
(2010) MECCANICA. 45(3). p.341-353
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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) mu(v (disk)) cannot explain the observed oscillations, as a linear mu(v (disk)) relation would produce oscillations with an ever increasing amplitude until v (rel,min)a parts per thousand 0. During the experiments values for v (rel,min) higher than 0 could be observed. At least the higher order terms of mu(v (disk)) need to be taken into account. The correlation between the slope of mu(v (disk)) and the occurrence of oscillations is however less than perfect. Taking into account the higher order terms of the relation mu(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 mu(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 mu(v (disk)) curve towards higher velocities as predicted by the Stribeck curve.
Keywords
Vibration, Friction, Wet clutch, Stiffness

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Chicago
Ost, Wouter, Patrick De Baets, Mia Loccufier, and Stijn Van Autrève. 2010. “Torsional Vibrations of Wet Clutches: Influence of Mechanical Parameters.” Meccanica 45 (3): 341–353.
APA
Ost, W., De Baets, P., Loccufier, M., & Van Autrève, S. (2010). Torsional vibrations of wet clutches: influence of mechanical parameters. MECCANICA, 45(3), 341–353.
Vancouver
1.
Ost W, De Baets P, Loccufier M, Van Autrève S. Torsional vibrations of wet clutches: influence of mechanical parameters. MECCANICA. 2010;45(3):341–53.
MLA
Ost, Wouter, Patrick De Baets, Mia Loccufier, et al. “Torsional Vibrations of Wet Clutches: Influence of Mechanical Parameters.” MECCANICA 45.3 (2010): 341–353. Print.
@article{1111293,
  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) mu(v (disk)) cannot explain the observed oscillations, as a linear mu(v (disk)) relation would produce oscillations with an ever increasing amplitude until v (rel,min)a parts per thousand 0. During the experiments values for v (rel,min) higher than 0 could be observed. At least the higher order terms of mu(v (disk)) need to be taken into account.
The correlation between the slope of mu(v (disk)) and the occurrence of oscillations is however less than perfect. Taking into account the higher order terms of the relation mu(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 mu(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 mu(v (disk)) curve towards higher velocities as predicted by the Stribeck curve.},
  author       = {Ost, Wouter and De Baets, Patrick and Loccufier, Mia and Van Autr{\`e}ve, Stijn},
  issn         = {0025-6455},
  journal      = {MECCANICA},
  keyword      = {Vibration,Friction,Wet clutch,Stiffness},
  language     = {eng},
  number       = {3},
  pages        = {341--353},
  title        = {Torsional vibrations of wet clutches: influence of mechanical parameters},
  url          = {http://dx.doi.org/10.1007/s11012-009-9250-y},
  volume       = {45},
  year         = {2010},
}

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