Nonaxisymmetric Effects for Three-Dimensional Analysis of a Brake

Floquet, Anne; Baietto, Marie-Christine

doi:10.1115/1.2928852

Cited by 30 publications

(26 citation statements)

References 7 publications

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“…76 = the temperature is more smooth under pad transition, whereas on the edge of external surface is almost constant in the circumference because of the distance from the rubbing path. The presented plots of temperature drawn along the circumferential direction which correspond to the articles of Floquet and Dubourg [9] and Cho and Ahn [16].…”

Section: Resultsmentioning

confidence: 99%

“…Simplifications of a real three-dimensional modelling techniques into two-dimensionality relating to the heat rate uniformly distributed in circumferential direction were so far accomplished [7][8][9][10][11]. In point of fact they enter simplifications of three-dimensional process of heating, which is omitted in systems where the friction surface of a body and counterbody is equal aircraft brakes and clutch systems [12].…”

Section: Introductionmentioning

confidence: 99%

“…The hybrid method combining the finite element method and the fast Fourier transform (FFT) technique, as an alternative approach in order to reduce computational time without loss of the temperature alterations owing the circumference of a disc brake was used [3,4,9,10,15,16]. The temperature distributions during different operation conditions were presented.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of disc brake temperature distribution during single braking under non-axisymmetric load

Adamowicz

Grześ

2011

Applied Thermal Engineering

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This paper aims to study and compare the temperature distributions caused by mutual sliding of two members of the disc brake system basing on two-and three-dimensional FE modeling techniques and complexity of the phenomenon. First step of the analysis based on the previously developed model where the intensity of heat flux was assumed to be uniformly distributed on the friction surface of disc during braking process, and the heat is transferred exclusively in axial direction, whereas during the second, the three-dimensional rotor is subjected to the non-axisymmetric thermal load to simulate realistic thermal behaviour of the brake action. Operation conditions, thermo-physical properties of materials and dimensions of the brake system were adopted from the real representation of the braking process of the passenger vehicle. Arbitrarily selected four values of the velocities at the moment of brake engagement were applied to the models so as to investigate theirs influence on the obtained solutions of the temperature evolutions on the contact surface of the disc volume referring to two separated finite element analysis. The large amount of heat generated at the pad/disc interface during emergency braking indisputably evokes non-uniform temperature distributions in the domain of the rotor, whereas the pad element is constantly heated during mutual sliding. The obtained results of the original code of three-dimensional modeling technique implemented to the conventional FE software revel high agreement with the solution of simplified process of friction heating.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Analysis of disc brake temperature distribution during single braking under non-axisymmetric load

Adamowicz

Grześ

2011

Applied Thermal Engineering

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“…The only alternative means for analysis of effect of the real contact area distribution on the real contact temperature distribution is utilising Finite Element Analysis (FEA). FEA has been proved as an effective method to study the behaviour of friction brakes in terms of stress/strain, temperature, thermoelastic instability (TEI), vibration/noise and service life in vehicle braking [2,[14][15][16][17][18]. Different approaches and assumptions have been used for model simplification in different FE analyses.…”

Section: The Fe Modeling Approach For Analysis Of Pad Temperature Dismentioning

confidence: 99%

Investigation of disc/pad interface temperatures in friction braking

Qi¹,

Day²

2007

Wear

110

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Maintaining appropriate levels of disc-pad interface temperature is critical for the overall operating effectiveness of disc brakes and implicitly the safety of the vehicle.Measurement and prediction of the distribution and magnitude of brake friction interface temperatures are difficult. A thermocouple method with an exposed hot junction configuration is used for interface temperature measurement in this study.Factors influencing the magnitude and distribution of interface temperature are discussed. It is found that there is a strong correlation between the contact area ratio and the interface maximum temperature. Using a designed experiment approach, the factors affecting the interface temperature, including the number of braking applications, sliding speed, braking load and type of friction material were studied. It was found that the number of braking applications affects the interface temperature the most. The real contact area between the disc and pad, i.e. pad regions where the bulk of the kinetic energy is dissipated via friction, has significant effect on the braking interface temperature. For understanding the effect of real contact area on local interface temperatures and friction coefficient, Finite Element Analysis (FEA) is conducted. It is found that the maximum temperature at the friction interface does not increase linearly with decreasing contact area ratio. This finding is potentially significant in optimising the design and formulation of friction materials for stable friction and wear performance. Tave Change of average temperature of the brake pad body (°C) DoE A statistical design of experiments approach emf ElectroMotive Force WIRE An exposed wire thermocouple configuration for brake disc/pad interface temperature measurement RUB A rubbing thermocouple for brake disc surface temperature measurement Key words

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“…This coupled thermomechanical process is susceptible to thermoelastic instability (TEI). Above a certain critical speed, a nominally uniform pressure distribution is unstable, giving way to localization of load and heat generation and hence to hot spots at the sliding interface (Barber 1969;Kennedy & Ling 1974;Floquet & Dubourg 1994;Bryant et al . 1995;Kao et al .…”

Section: Introductionmentioning

confidence: 99%

Eigenvalue solution of thermoelastic instability problems using Fourier reduction

Barber

Zagrodzki³

2000

Proc. R. Soc. Lond. A

115

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A nite-element method is developed for determining the critical sliding speed for thermoelastic instability of an axisymmetric clutch or brake. Linear perturbations on the constant-speed solution are sought that vary sinusoidally in the circumferential direction and grow exponentially in time. These factors cancel in the governing thermoelastic and heat-conduction equations, leading to a linear eigenvalue problem on the two-dimensional cross-sectional domain for the exponential growth rate for each Fourier wavenumber. The imaginary part of this growth rate corresponds to a migration of the perturbation in the circumferential direction.The algorithm is tested against an analytical solution for a layer sliding between two half-planes and gives excellent agreement, for both the critical speed and the migration speed. Criteria are developed to determine the mesh re nement required to give an adequate discrete description of the thermal boundary layer adjacent to the sliding interface. The method is then used to determine the unstable mode and critical speed in geometries approximating current multi-disc clutch practice.

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Nonaxisymmetric Effects for Three-Dimensional Analysis of a Brake

Cited by 30 publications

References 7 publications

Analysis of disc brake temperature distribution during single braking under non-axisymmetric load

Analysis of disc brake temperature distribution during single braking under non-axisymmetric load

Investigation of disc/pad interface temperatures in friction braking

Eigenvalue solution of thermoelastic instability problems using Fourier reduction

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