Noise and Vibration Analysis of an S-Cam Drum Brake

Day, Andrew J.; Kim, S Y

doi:10.1243/pime_proc_1996_210_242_02

Cited by 17 publications

(20 citation statements)

References 7 publications

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“…In the automotive brake design the pressure distribution along lining area has a significant influence on brake dynamic stability. 10,11,6,12 Despite the fact automotive drum design is the same as general brakes, the focus of this project is different. 27–29 Hence, the normal pressure at the contact between lining and drum internal surface is: …”

Section: Methodsmentioning

confidence: 99%

“…Hence, relating equations (3)-(5) it is obtained the frictional force along the lining: The Coulomb’s law can also be applied for shear and normal stress, τ and σ, respectively: and Therefore, relating equations (3), (7), and (8), the stresses along the lining are obtained: and The dynamic model configured with rigid masses, mechanical springs, and dash-pots (lately neglected) is an efficient and widely known approach for the comprehension of the physical concept of brake operation. 7,4,30,20,31,10 Therefore, the contact introduced by lining and drum is characterized by contact rigidity, k c 19 : Where A l i n and h l i n are the area and thickness of lining, respectively. Equation (11) summarizes the importance of lining properties for contact rigidity and brake stability.…”

Section: Methodsmentioning

confidence: 99%

“…Surrounding these mechanisms, there are several factors as activating force, friction coefficient, 7–9 and contact pressure. 10,11,6,12,13 However, these are affected by paremeters strictly connected with brake components material properties, as Young’s modulus, 14,8,9,15–17,12,18 bending stiffness, and inertial moment. 19,20 Understanding the enviromental 21–23 and health 24,25 consequences of this issue and its urgency, this work aims to propose a method of preview squeal propensity of a drum brake system correlating two main brake material properties, Young’s modulus ( E) and friction coefficient ( μ), with instability parameters through the finite-element method ( F E M) and the complex eigenvalue analysis.…”

Section: Introductionmentioning

confidence: 99%

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Light duty automotive drum brake squeal analysis using the finite-element method

Dias

Rodrigues

Bezerra

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part L:

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The method presented in this work intends to analyze drum brake design parameters of a light duty automotive drum brake system. The main objective of this work is to correlate brake materials and unstability parameters to identify which condition will effectively reduce squeal propensity. The methodology involves (a) the finite-element method of the brake components, namely, drum, shoes, and frictional linings, (b) static calculations to get a pre-stress state around which (c) is computed the complex eigenvalues of the system. Hence, positive real parts indicate dynamic instabilities which are explored by varying parameters, namely, the modulus of elasticity of the materials and the friction coefficient at the contact of the shoes with the drum. According to calculations, it was observed that there exist a given range of values for Young’s modulus and friction coefficient that are favorable to reduce drum brake squeal occurrence. In addition, the method proposed delivered results that match with brake squeal literature.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Light duty automotive drum brake squeal analysis using the finite-element method

Dias

Rodrigues

Bezerra

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part L:

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“…Addressing issues related to BF variation is critical for quantifying performance variation in the overall vehicle brake system. Therefore, the foundation brake performance must be ensured before overall brake system performance is addressed [5] to [7].…”

Section: Introductionmentioning

confidence: 99%

Optimization of the Brake Factor for an S-Cam Foundation Brake using RSM

Sayim¹,

Zhang²

2016

SV-JME

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The brake factor (BF) scales the vehicle's braking force; therefore, the vehicle brake performance variation due to the foundation brake can be attributed to the BF variation. In this work, the BF reduction is considered in the design stage of an S-Cam foundation brake within dimensional properties in order to have stable, predictable and improved vehicle brake performance. First, brake lining wear types were defined and then actuation cam-roller position effects were formulated. Dimensional parameters were varied within certain design-possible ranges to quantify BF variation theoretically. The response surface method (RSM) was used to identify the BF-reduced combination of dimensions within theoretical results. In the meantime, a new testing procedure was introduced and then a new testbed was designed and built to validate relative improvement of BF experimentally without thermal effects on friction. It was investigated that a substantial improvement (22.93 %) on BF could be obtained if appropriate dimensions were selected in the design stage.

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“…From the modelling aspect, finite element analysis on the S-cam drum brake showed unstable modes based on the binary flutter instability mechanism, which matched the trends of other reported experimental observations. 12 Hamabe et al 13 used complex eigenvalue analysis of the finite element model in analysing the squeal problem in drum brakes. They proved that complex eigenvalue analysis is also effective in drum brake squeal although the modal density of the drum brake is higher than that of the disc brake.…”

Section: Introductionmentioning

confidence: 99%

The operational deflection shapes and transient analysis of the brake shoes in drum brake squeal

Hamid

Teoh

Ripin

2013

Proceedings of the Institution of Mechanical Engineers, Part D:

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The operational deflection shapes were used to identify the mode of vibration for the brake shoes in drum brake squeal. The measurement of the operational deflection shapes of the brake shoes during drum brake squeal, which was in the torsional mode, was similar to that of the modes obtained from the experimental modal analysis of the brake shoes under the in-contact static condition. A two-degree-of-freedom model was developed on the basis of the experimental modal analysis data within the limited bandwidth of the squeal frequency of 1850 Hz. In this work, the operational deflection shape was used for determination of a structural dynamic modification to be carried out on the brake shoes in order to maximize the damping of the torsional mode as a way to improve the stability of the system. The lumped-parameter model was then used to assess the effect of the structural dynamic modification on the squeal based on the transient analysis, which showed a similar trend and can assist brake designers in evaluating the critical parameter to obtain a squeal-free drum brake design.

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Noise and Vibration Analysis of an S-Cam Drum Brake

Cited by 17 publications

References 7 publications

Light duty automotive drum brake squeal analysis using the finite-element method

Light duty automotive drum brake squeal analysis using the finite-element method

Optimization of the Brake Factor for an S-Cam Foundation Brake using RSM

The operational deflection shapes and transient analysis of the brake shoes in drum brake squeal

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