Impact of contact stiffness heterogeneities on friction-induced vibration

Magnier, Vincent; Brunel, Jean-François; Dufrenoy, Philippe

doi:10.1016/j.ijsolstr.2014.01.005

Cited by 30 publications

(13 citation statements)

References 23 publications

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“…From the results in the above section, two macroscopic contact zones corresponding to the two different unstable frequencies are assumed (Figure 17). In order to study the influence of plateaus distribution on mode-coupling instability at 2100 Hz, as in [14], the macroscopic unstable contact zone is divided in a certain number of uniform patches (Figure 17a). Each patch is independent from each other.…”

Section: Mesoscopic Scalementioning

confidence: 99%

“…The height distribution of asperities reportedly affects the tangential contact stiffness and can lead to self-excited vibration. Magnier et al [14] proposed an analytical model with a contact interface including stiffness heterogeneities between pad and disc and demonstrated the influence of these kinds of heterogeneities on mode lock-in. They found that if the size of heterogeneities is large, the effect of contact localization is important.…”

Section: Introductionmentioning

confidence: 99%

“…However for a large number of simulations, transient analysis proves to be very expensive on computational time. Mode-coupling mechanism is used in many numerical models of brake squeal [14,22,23,[33][34][35]. Several system parameters influence mode-coupling such as friction coefficient [31], structural damping [36], geometry and contact between the components of a brake system [37,38] or the length of sliding contact zone [21].…”

Section: Introductionmentioning

confidence: 99%

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Multi-Scale Contact Localization and Dynamic Instability Related to Brake Squeal

et al. 2020

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Friction-induced vibrations (brake squeal) produced during braking applications have been one of the major problems in the transportation for many years. It can be the most troublesome for passengers because of its high frequency and acoustic pressure. The role of frictional contact surface geometry on the occurrence of squeal was investigated recently by some researchers. However, it has never been systematically studied at different scales simultaneously. Contact localizations are induced on the one hand by macro effects such as thermal dilatation (macroscopic scale) and on the other hand, by the heterogeneity of third body (tribolayer) generated by friction (mesoscopic scale). The aim of this paper is to investigate the effect of contact localization at both scales through stability analysis on a simplified pad on disc system. The model has been developed numerically by the finite element method (FEM) to introduce a non-uniform contact at macroscopic and mesoscopic scales. The results showed a strong dependency between squeal frequencies and effective contact zone at macroscopic and mesoscopic scales for the investigated configuration. Especially, it is found that squeal frequencies depend on the contact area at a macroscopic scale whereas the probability of occurrence of squeal frequency strongly relies on mesoscopic contact distribution.

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Section: Mesoscopic Scalementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Multi-Scale Contact Localization and Dynamic Instability Related to Brake Squeal

et al. 2020

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“…One of the phenomena at the origins of such noises are stick-slip [20]. The appearance of stick-slip instability is influenced by the combination of several tribological and dynamical processes and parameters [21,22], which in real systems are difficult to discern. One cause of instability is a falling characteristic of the friction coefficient with the relative velocity that may lead to negative damping, causing stick-slip oscillations [23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Numerical and experimental analysis of the bi-stable state for frictional continuous system

et al. 2020

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Unstable friction-induced vibrations are considered an annoying problem in several fields of engineering. Although several theoretical analyses have suggested that friction-excited dynamical systems may experience sub-critical bifurcations, and show multiple coexisting stable solutions, these phenomena need to be proved experimentally and on continuous systems. The present work aims to partially fill this gap. The dynamical response of a continuous system subjected to frictional excitation is investigated. The frictional system is constituted of a 3D printed oscillator, obtained by additive manufacturing that slides against a disc rotating at a prescribed velocity. Both a finite element model and an experimental setup has been developed. It is shown both numerically and experimentally that in a certain range of the imposed sliding velocity the oscillator has two stable states, i.e. steady sliding and stick–slip oscillations. Furthermore, it is possible to jump from one state to the other by introducing an external perturbation. A parametric analysis is also presented, with respect to the main parameters influencing the nonlinear dynamic response, to determine the interval of sliding velocity where the oscillator presents the two stable solutions, i.e. steady sliding and stick–slip limit cycle.

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“…To have the most appropriate model to describe vibration induced by friction in braking systems, there are four mechanisms to consider: stick-slip, sprag-slip, variable dynamic friction coefficient, and mode-coupling of degrees of freedom (DOF). 8–11 For squeal noise, it is generally associated with geometric instability or mode-coupling instability. 12 Numerous research works have conducted many modeling proposal to investigate the friction-induced vibration in brake squeal, and we can classify these models into two categories: finite element method and minimal analytic model.…”

Section: Introductionmentioning

confidence: 99%

Investigation of friction-induced vibration in a disk brake model, including mode-coupling and gyroscopic mechanisms

Ghorbel

Zghal

Abdennadher

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part D:

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The brake squeal reduction has been extensively investigated in many academic and industrial researchers. Friction-induced vibrations can be considered as a dynamic instability problem. Generally, automotive engineers and researchers working in the domain of disk brake noise treat instabilities due to the force of friction as a friction-induced vibration. In the case of squeal noise, mode coupling may cause instability of the system. The aim of this article is to propose a minimal two degree of freedom disk brake model in order to investigate the effects of different parameters on mode-coupling instability. This model takes into account self-excited vibration, gyroscopic effect, friction-induced damping, and brake pad geometry. Thus, a stability analysis of equilibrium by calculating complex eigenvalues is presented to investigate the influence of the main parameters on the stability zone such as the opening angle of the brake pad and preload. For the validation of the stability analysis, squeal index and time domain response are used. The results obtained show the importance of optimizing the physical and geometrical parameters of the brake and that some of these parameters have greater effects compared to the others to reduce noise.

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Impact of contact stiffness heterogeneities on friction-induced vibration

Cited by 30 publications

References 23 publications

Multi-Scale Contact Localization and Dynamic Instability Related to Brake Squeal

Multi-Scale Contact Localization and Dynamic Instability Related to Brake Squeal

Numerical and experimental analysis of the bi-stable state for frictional continuous system

Investigation of friction-induced vibration in a disk brake model, including mode-coupling and gyroscopic mechanisms

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