History effect on squeal with a mesoscopic approach to friction materials

Magnier, Vincent; Ramasami, Davis Naidoo; Brunel, Jean-François; Dufrenoy, Philippe; Chancelier, Thierry

doi:10.1016/j.triboint.2017.06.031

Cited by 11 publications

(4 citation statements)

References 20 publications

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“…Dai et al [15] carried out a numerical investigation of the effect of adding chamfers to pad linings and found that chamfering lowers the propensity for instability. More recent works introduce enriched material and surface parameters and their evolution with loading, showing as in experiments, that they could influence the instability [16]. Reference [17] propose a numerical strategy which allows to integrate the roughness at the interface into a complete brake with a squeal study.…”

Section: Introductionmentioning

confidence: 99%

Experimental set-up and the associated model for squeal analysis

Duboc¹,

Magnier²,

Brunel³

et al. 2020

Mechanics & Industry

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Brake squeal is commonly defined at frequency upper than 1000 Hz and occurs if the system has a very high amplitude mechanical vibration with sound pressure level above 120 dB. Many studies are devoted to this problem and many of recent ones show that contact conditions and friction material behavior have a major influence on squeal occurrence. To investigate this aspect, an experimental set-up has been developed in this study. It is based on a simplified system in order to focus on the influence of the material in the one hand and surface conditions in the other hand. In this paper, the design of the pin-on-disc is described and an analytical model is also presented in order to understand the dynamic behavior of the system. Macroscopic aspects are investigated by varying the pin geometry. The results show clearly the influence of the variation of the contact length size on squeal occurrence. Comparison with the model shows good agreement and exhibit the necessity of considering an improved model of the friction material behavior. This study also gives information on the comprehension of squeal mechanisms.

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Section: Introductionmentioning

confidence: 99%

Experimental set-up and the associated model for squeal analysis

Duboc¹,

Magnier²,

Brunel³

et al. 2020

Mechanics & Industry

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“…In the brake industry, the different noise emissions, resulting from the contact between the lining material and the disc surface during the braking phase, are associated to these different frictional scenarios. In fact, while high frequency squeal noise is more likely to be associated to mode coupling instabilities [24][25][26][27][28], groan noise is more likely to be associated to stick-slip instabilities [29,30].…”

Section: Introductionmentioning

confidence: 99%

Experimental Evaluation of Brake Pad Material Propensity to Stick-Slip and Groan Noise Emission

et al. 2018

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Frictional and dynamic responses of brake pad materials, when sliding on brake disc counterfaces, are at the origin of noise, vibration and harshness (NVH) issues such as brake noise emissions. In more detail, groan is a low frequency noise emission often associated to the stick-slip frictional response of the brake system. The instability of such contact is the result of the coupling between the system dynamics and the frictional response of the materials in contact. In this work, an experimental approach is proposed for measuring the frictional response and the propensity to generate stick-slip of different lining materials, coming from commercial brake pads, when sliding on a worn surface of a brake disc, under the same controlled boundary conditions. The proposed methodology allowed for comparing the propensity of the tested pad materials to stick-slip vibrations, which is in agreement with feedback from automotive industry on groan emission.

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“…From an experimental point of view, both industrial and academic test rigs have been developed in order to propose contributions for a better understanding of the phenomena of brake squeal, as well as to investigate which physical phenomena could be the cause of the brake noise. For example some rely on research more focused on friction-induced vibrations [6,7,8,9,10,11,12,13,14,15,16,17], while others study the subject via thermal considerations [18,19] or a tribological point of view [20,21,22,23,24,25]. On the other hand, some researchers [23,26,27,28] are also interested in dealing with the problem of brake squeal by considering additionally the problem of acoustic radiated noise due to friction-induced vibration or roughness at the frictional interface.…”

Section: Introductionmentioning

confidence: 99%

Transient vibro-acoustic analysis of squeal events based on the experimental bench FIVE@ECL

2020

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The proposed study investigates the transient and stationary non-linear vibrations and acoustic phenomena occurring during the squeal phenomenon. Experiments are performed on the test bench Friction-Induced Vibration and noisE at Ecole Centrale de Lyon (FIVE@ECL).The first major contribution of the study is to demonstrate the ability of this test bench to reproduce transient squeal events for a given operational condition, allowing to conduct a thorough and robust study on the physical understanding of transient vibration and acoustic squeal events. The second main contribution is to discuss the potential links between the emergence of vibrations on the two pads, the disc and the caliper, and the squeal noise in near-field and far-field.

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History effect on squeal with a mesoscopic approach to friction materials

Cited by 11 publications

References 20 publications

Experimental set-up and the associated model for squeal analysis

Experimental set-up and the associated model for squeal analysis

Experimental Evaluation of Brake Pad Material Propensity to Stick-Slip and Groan Noise Emission

Transient vibro-acoustic analysis of squeal events based on the experimental bench FIVE@ECL

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