Surface Contact Analysis Model for Squeal on Disk Brake

Oura, Yasunori; Kurita, Yutaka; Matsumura, Yuichi; Tamura, Tsutomu

doi:10.1299/kikaic.73.1977

Cited by 6 publications

(3 citation statements)

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“…Figure 12 outlines the surface-contact-analysis model we used for analysis (7) . The disk in the model is expressed by a vibration system with one-degree-of-freedom (translational direction).…”

Section: Surface-contact-analysis Modelmentioning

confidence: 99%

“…The test results confirmed that squeal frequency increased when the thrust load for braking applied to the pad was increased. Next, the mechanism responsible for generating squeal was examined by using a surface-contact-analysis model where the friction-contact surface was reproduced by using distributed springs (7) . The results obtained from analysis clarified that the dependence of pad rigidity on thrust pressure caused squeal to generate, and that it also influenced the sound-pressure-level (SPL) and the frequency of generated squeal.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Brake Pad Thickness on Disk Brake Squeal

Oura¹,

Kurita²,

Nishizawa³

et al. 2010

JSDD

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A squeal test using a pad with a different thickness demonstrated that a squeal with a higher frequency can be generated if a thin pad is used. The factors that changed as a result of pad thickness were termed 'difference of pad rigidity' and 'dimension difference in the thickness direction of the pad,' and the influence each factor exerted on the squeal was clarified. First, the dynamic stiffness of the pads used for the squeal tests were measured by adding a vibration that imitated the frequency and amplitude of the squeal. The measurement showed that the pad rigidity becomes hard when the pad thickness becomes thin. In addition, the pad vibrated with the same amplitude and the same phase from the frictional contact surface to the back plate in the thickness direction. The pad rigidity is in inverse proportion to the pad thickness because the pad can be viewed as springs in series in the thickness direction. Next, the influence that pad thickness exerted on squeal was analyzed by using a surface-contact-analysis model that reproduced the pad rigidity with a distributed spring and the dimension difference in the thickness direction of the pad with distance from the contact surface to the rotational center of the pad. Results showed that the squeal frequency becomes high when the pad rigidity becomes hard. If the dimension in the thickness direction of the pad becomes small, the squeal is not generated easily; however, the dimension does not influence the squeal frequency.

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Section: Surface-contact-analysis Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of Brake Pad Thickness on Disk Brake Squeal

Oura¹,

Kurita²,

Nishizawa³

et al. 2010

JSDD

Self Cite

View full text Add to dashboard Cite

show abstract

“…Papinniemi extended a 4-DOF model from Hoffman's 2-DOF model plus the disc motions in normal and tangential directions [20]. Oura proposed a 3-DOF model for a pad-on-disc system including the rotation and translation motions of the pad as well as the translation motion of the disc [21,22]. These models mentioned above revealed that even when the friction coefficient is constant, the systems may be unstable if the friction force couples related degrees-of-freedom together [23].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Friction-Induced Vibration Leading to Brake Squeal Using a Three Degree-of-Freedom Model

et al. 2017

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Friction-induced vibration is a common phenomenon in nature and thus has attracted many researchers' attention. Many of the mathematical models that have been proposed on the basis of mode coupling principle, however, cannot be utilized directly to analyse the generation of friction-induced vibration that occurs between two bodies because of a difficulty relating model parameters to definite physical meaning for real friction pairs. In this paper, a brake squeal experiment is firstly carried out by using a simple beam-on-disc laboratory apparatus. Experimental results show that brake squeal correlates with the bending mode of the beam and the nodal diameter out-of-plane mode of the disc as well as the cantilever length of the beam. Then, a specific three degree-of-freedom dynamic model is developed of the beamon-disc system and the vibration behaviour is simulated by using the complex eigenvalue analysis method and a transient response analysis. Numerical simulation shows that the bending mode frequency of the beam a little greater than the frequency of the nodal diameter out-of-plane mode and a specific incline angle of the leading area to the normal line of the disc as well as a certain friction coefficient, are necessary conditions for the mode coupling of a frictional system. Results also show that when the frictional system is transited from a steady state to an unstable state for the variation of parameters, its kinetic and potential energy increase with time due to continuous feed-in energy from the friction force while the dynamic responses of the system change from the beating oscillation to the divergent, which leads to the friction-induced vibration and squeal noise.

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Influence of Pads' Surface Texture on Disk Brake Squeal

Nishizawa¹,

Kurita²,

Oura³

et al. 2012

Trans.JSME(C)

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Preventing brake squeal is a significant task in brake development because brake squeal bothers users, thereby reducing a vehicle's commercial value. Many researchers have tried to find the mechanisms that cause brake squeal, so the number of complaint to brake squeal is declining. However, brake squeal sometimes appears after a vehicle has been in use for years even though it was not generated early in the vehicle's life. In order to enable people to use vehicles for a long time with a high satisfaction level, it is important to find the factor that causes brake squeal to arise gradually because of specific changes; so we focused on the stiffness of brake pads, which are always wearing during braking, because the pads' stiffness correlates with brake squeal. This study presents the influence of pads' surface texture on disk brake squeal. Pads with different surface texture were prepared by changing the braking time and machining. We measured the pads' stiffness, which we evaluated by exciting a pad at the frequency and vibration amplitude that cause brake squeal. The measurement results show that pads' stiffness increases as their surface becomes smoother, which means that the surface stiffness of pad influences the pads' stiffness. Finally, we used a numerical model to analyze the generation of squeal, which is caused by pads' surface texture.

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Surface Contact Analysis Model for Squeal on Disk Brake

Cited by 6 publications

References 0 publications

Influence of Brake Pad Thickness on Disk Brake Squeal

Influence of Brake Pad Thickness on Disk Brake Squeal

Analysis of Friction-Induced Vibration Leading to Brake Squeal Using a Three Degree-of-Freedom Model

Influence of Pads' Surface Texture on Disk Brake Squeal

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