System dynamic instabilities induced by sliding contact: A numerical analysis with experimental validation

被引：14
|
作者：
Brunetti, J. [1 ,2 ]
Massi, F. [3 ]
Saulot, A. [1 ]
Renouf, M. [4 ]
D'Ambrogio, W. [2 ]
机构：
[1] Univ Lyon, LaMCoS, Contacts & Struct Mech Lab, CNRS,INSA Lyon,UMR 5259, F-69621 Villeurbanne, France
[2] Univ Aquila, Dept Ind Engn Informat & Econ, DIIIE, I-67100 Laquila, Italy
[3] Univ Roma La Sapienza, Dept Mech & Aerosp Engn, DIMA, I-00184 Rome, Italy
[4] Univ Montpellier 2, LMGC, Mech & Civil Engn Lab, CNRS,UMR 5508, F-34096 Montpellier, France
来源：
MECHANICAL SYSTEMS AND SIGNAL PROCESSING | 2015年 / 58-59卷
关键词：
Friction-induced vibrations; Mode coupling; Energy balance; Numerical tribology; Damping; DISC BRAKE SQUEAL; FRICTION INDUCED OSCILLATIONS; MODE-COUPLING INSTABILITY; VIBRATIONS; INTERFACES;
D O I：
10.1016/j.ymssp.2015.01.006
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
Mechanical systems present several contact surfaces between deformable bodies. The contact interface can be either static (joints) or in sliding (active interfaces). The sliding interfaces can have several roles and according to their application they can be developed either for maximizing the friction coefficient and the energy dissipation (e.g. brakes) or rather to allow the relative displacement at joints with a maximum efficiency. In both cases the coupling between system and local contact dynamics can bring to system dynamics instabilities (e.g. brake squeal or squeaking of hip prostheses). This results in unstable vibrations of the system, induced by the oscillation of the contact forces. In the literature, a large number of works deal with such kind of instabilities and are mainly focused on applied problems such as brake squeal noise. This paper shows a more general numerical analysis of a simple system constituted by two bodies in sliding contact: a rigid cylinder rotating inside a deformable one. The parametrical Complex Eigenvalue Analysis and the transient numerical simulations show how the friction forces can give rise to in-plane dynamic instabilities due to the interaction between two system modes, even for such a simple system characterized by one deformable body. Results from transient simulations highlight the key role of realistic values of the material damping to have convergence of the model and, consequently, reliable physical results. To this aim an experimental estimation of the material damping has been carried out. Moreover, the simplicity of the system allows for a deeper analysis of the contact instability and a balance of the energy flux among friction, system vibrations and damping. The numerical results have been validated by comparison with experimental ones, obtained by a specific test bench developed to reproduce and analyze the contact friction instabilities. (C) 2015 Elsevier Ltd. All rights reserved.
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页码：70 / 86
页数：17
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