The evaluation of disc brake squeal propensity through a fully coupled transient thermomechanical model

Hassan, Muhammad Zahir; Brooks, Peter C.; Barton, D.C.

doi:10.1177/0954407012453815

Cited by 12 publications

(11 citation statements)

References 27 publications

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“…[15][16][17] Much research work has been performed during the past few decades to identify and analyze the factors influencing squeal noise and their interaction mechanisms, both through experimental tests 5,18,19 and through numerical approaches. [20][21][22][23][24] In addition, some corresponding reviews have been published [25][26][27][28] and provide a better understanding of the brake squeal phenomenon.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of the squeal characteristics in railway disc brakes

Tang

Zhang

et al. 2018

Proceedings of the Institution of Mechanical Engineers, Part J:

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In this study, a bespoke small-scale brake dynamometer was developed to simulate the braking conditions of a railway disc brake system. Braking squeal experiments were performed with this brake dynamometer at different braking pressures and disc rotation speeds, and the influence of these braking parameters on the generation and characterization of the squeal noise was evaluated and discussed. The obtained results show that both the braking pressure and the disc rotation speed have a significant influence on the generation and evolution of the squeal noise. Higher rotation speeds are found to result in higher sound pressures and more complicated squeal noise spectra, except at a particular braking pressure, for which the highest sound pressure level is found at various disc rotation speeds. This phenomenon indicates that a combination of specific braking parameters may lead to a strong instability of the brake system and consequently to squeal noise. Additionally, a possible correlation of the squeal noise characteristics with the pressure distribution at the braking interface was found and discussed.

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Section: Introductionmentioning

confidence: 99%

Experimental investigation of the squeal characteristics in railway disc brakes

Tang

Zhang

et al. 2018

Proceedings of the Institution of Mechanical Engineers, Part J:

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“…Young's modulus change, material and shims shear modulus, and some geometrical effects such as the hat torsional stiffness, Ishii-Dodson et al [15]. The commonly called 'rotating-heat-source' effect can be taken into account with the introduction of a fully coupled thermo-mechanical analysis before executing an instability study as demonstrated by Hassan et al [16], [17], [18] and using complex eigenvalue technique by…”

Section: Symbolmentioning

confidence: 99%

“…It can influence tangential in-plane modes of vibrations, Young's modulus change, shear modulus of material and shims, and some geometrical effects such as the hat torsional stiffness. 15 The commonly called 'rotatingheat-source' effect can be taken into account with the introduction of a fully coupled thermo-mechanical analysis before executing an instability study as demonstrated by Hassan et al [16][17][18] and using the complex eigenvalue technique by Kung et al 19 The finite element (FE) method allows an accurate representation of complex geometries and boundary/loading conditions, which traditional lumped parameter techniques cannot address. Magnier et al 20 successfully studied the influence of pad/disc contact on brake squeal.…”

Section: Introductionmentioning

confidence: 99%

Methodology for predicting brake squeal propensity using complex eigenvalue analysis, including thermo-mechanical effects

Tirovic

Vianello

Bannister

2018

Proceedings of the Institution of Mechanical Engineers, Part D:

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With brake squeal being most prevalent Noise Vibration and Harshness (NVH) issue in modern vehicles, this paper presents an improved methodology for brake squeal propensity prediction at the design stage. The research established four clearly defined "Stages" in conducting Finite Element (FE) squeal analyses, describing crucial input data, modelling procedures, outputs and results validations. Stage 1 deals with freefree modal characteristics of individual brake components and their material characteristics. Stage 2 combines individual parts, conducting Brake Assembly Mechanical FE Analyses. Stage 3 concentrates on fully Coupled Thermo-mechanical FE Analyses, and the concluding Stage 4 focuses on Brake Assembly Stability Analyses. Validations proved that very accurate predictions are possible, but the geometries, material characteristics and established modelling procedures must be strictly followed. Material characteristics were most prone to introduce discrepancies with measured values. 'Generic' values are found to be unacceptable and conducting own measurements was necessary, in particular for the friction material, whose anisotropic properties have been measured in detail, leading to high accuracy in predicting pad natural modes and frequencies. In Stage 4 the stability analyses of the full brake assembly were based on the Complex Eigenvalue Analysis (which included thermal aspects), with the sign of the real part giving an indication of stability and the imaginary part defining the frequency of the unstable mode. Instabilities and frequencies predicted match well with the values measured in dynamometer tests, clearly demonstrating the influence of thermal effects. The final output of the procedures described in this Paper is a validated 3D thermo-mechanical FE NVH brake assembly model in which natural frequencies and modes, instabilities and contributing factors can be predicted at any time during a brake application.

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“…[1][2][3][4][5] In general, friction can dissipate the energy of systems and act as a stabilization mechanism; however, it can also excite vibration in engineering and daily life under certain circumstances. [6][7][8] One important kind of friction-induced vibration is the stick-slip oscillation which consists of two kinds of motion schemes: a stick regime in which the friction pair moves together and a slip regime in which there is relative motion between them. 9,10 Stick-slip oscillation widely exists in many different fields.…”

Section: Introductionmentioning

confidence: 99%

The effects of grooved rubber blocks on stick–slip and wear behaviours

Wang

Ouyang

et al. 2018

Proceedings of the Institution of Mechanical Engineers, Part D:

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This work presents an experimental and theoretical combined study of the effects of the elastic rubber blocks with different surface modifications on the friction-induced stick–slip oscillation and wear of a brake pad sample in sliding contact with an automobile brake disc. The experiments are conducted on the customized experimental setup in a pad-on-disc configuration. The experimental results show that (1) the friction system with the plain rubber block still exhibits visible stick–slip oscillation, but the intensity of the stick–slip oscillation is reduced to a certain degree compared with the Original friction system (without rubber block); (2) the grooved rubber blocks display a better ability to reduce the stick–slip oscillation compared with the plain rubber block; (3) the rubber blocks with a vertical groove (perpendicular to the relative velocity) or a horizontal groove (parallel to the relative velocity) or a diagonal groove (45° inclined to the relative velocity) on their surfaces can suppress the stick–slip oscillation more effectively with various degrees of success. The experimental results also reveal the varying effects of the different rubber blocks on wear. To explain the experimental phenomenon reasonably, a theoretical analysis is conducted to investigate the effects of different rubber blocks on both stick–slip oscillation and wear using ABAQUS. Furthermore, the analysis of the contact pressure on the pad interfaces and the deformation of the rubber blocks are studied to provide a possible explanation of the experimental results.

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The evaluation of disc brake squeal propensity through a fully coupled transient thermomechanical model

Cited by 12 publications

References 27 publications

Experimental investigation of the squeal characteristics in railway disc brakes

Experimental investigation of the squeal characteristics in railway disc brakes

Methodology for predicting brake squeal propensity using complex eigenvalue analysis, including thermo-mechanical effects

The effects of grooved rubber blocks on stick–slip and wear behaviours

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