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Title: Lightly loaded lubricated impacts: idle gear rattle
Authors: Tangasawi, Osman A.M.
Theodossiades, Stephanos
Rahnejat, Homer
Keywords: Transmission idle gear rattle
Hydrodynamic regime of lubrication
Lubricant stiffness
Issue Date: 2007
Publisher: © Elsevier
Citation: TANGASAWI, O.A.M., THEODOSSIADES, S. and RAHNEJAT, H., 2007. Lightly loaded lubricated impacts: idle gear rattle. Journal of Sound and Vibration, 308(3-5), pp.418-430.
Abstract: Idle gear rattle is associated with the characteristic noise that unselected impacting gears radiate to the environment. It is induced by engine order vibration in the presence of backlash in the unengaged gear pairs, resulting in oscillatory response within their backlash range. A tribo-dynamic model of a front wheel drive manual transmission has been developed to study idle rattle, considering the hydrodynamic contact film reaction and flank friction. The model includes the torsional motions of the idle gears and the lateral motions of the supporting output shafts. The hydrodynamic lubricant film formed between the gear teeth under light impact loads behaves as a non-linear spring-damper mechanism, whilst the inclusion of the shafts’ bearing compliances introduces additional non-linear terms, which are modelled as piecewise linear functions. The aim of the paper is to demonstrate the effect of the lubricant on the system’s response, which is eventually transferred to the gearbox case through the bearings. The results are found to conform closely to experimental measurements taken from a vehicle equipped with a manual transmission of the same type.
Description: This paper was accepted for publication in the journal Journal of Sound and Vibration and the definitive version is available at http://dx.doi.org/10.1016/j.jsv.2007.03.077
Sponsor: The authors wish to express their gratitude to Ford Motor Company and the EPSRC for the sponsorship and financial support extended to this research project.
Version: Accepted for publication
DOI: 10.1016/j.jsv.2007.03.077
URI: https://dspace.lboro.ac.uk/2134/18656
Publisher Link: http://dx.doi.org/10.1016/j.jsv.2007.03.077
ISSN: 0022-460X
Appears in Collections:Published Articles (Mechanical, Electrical and Manufacturing Engineering)

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