A new prototype system for automated suppression of disc brake squeal

Budinsky, Tomas; Brooks, Peter C.; Barton, D.C.

doi:10.1177/0954407020964624

Cited by 3 publications

(1 citation statement)

References 14 publications

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“…The brake disc is a 284 mm diameter vented GCI disc and the brake pads use a semimetallic friction material made for the Lancia Delta. The brake pads are housed in a bespoke 4 piston brake calliper, previously designed to suppress brake squeal [34]. Two K-type thermocouples are used to measure disc surface temperature at different points on the free rubbing surface.…”

Section: Brake Dynamometer Set-upmentioning

confidence: 99%

The Effects of Corrosion on Particle Emissions from a Grey Cast Iron Brake Disc

Ghouri¹,

Barker²,

Brooks³

et al. 2022

SAE Technical Paper Series

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Reducing exhaust emissions has been a major focus of research for a number of years since internal combustion engines (ICE) contribute to a large number of harmful particles entering the environment. As a way of reducing emissions and helping to tackle climate change, many countries are announcing that they will ban the sale of new ICE vehicles soon. Electrical vehicles (EVs) represent a popular alternative vehicle propulsion system. However, although they produce zero exhaust emissions, there is still concern regarding non-exhaust emission, such as brake dust, which can potentially cause harm to human health and the environment. Despite EVs primarily using regenerative braking, they still require friction brakes as a backup as and when required. Moreover, most EVs continue to use the traditional grey cast iron (GCI) brake rotor, which is heavy and prone to corrosion, potentially exacerbating brake wear emissions. This study concentrates on emissions from a conventional grey cast iron friction brake before and after exposure to a corrosive environment. It was found that the effect of corrosion increases both the number and mass of particle emissions by over 50% and inhibits braking performance by reducing the coefficient of friction. The surface of the brake disc was also found to be affected by corrosion as many crevices and pits were formed.

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Section: Brake Dynamometer Set-upmentioning

confidence: 99%

The Effects of Corrosion on Particle Emissions from a Grey Cast Iron Brake Disc

Ghouri¹,

Barker²,

Brooks³

et al. 2022

SAE Technical Paper Series

Self Cite

View full text Add to dashboard Cite

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Developing an accurate finite element model for brake disc in contact with the pad using experimental modal analysis

Noohi,

Nikoobin,

Ashory

2024

Proceedings of the Institution of Mechanical Engineers, Part D:

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The brake system is a critical safety component in cars, and its performance is essential for the safety of both the driver and passengers. The stability of the brake disc and understanding the contact area between the disc and the brake pads are crucial aspects of brake system design and performance. This paper aims to create an accurate model of the brake system, especially the contact area between the disc and the pads. This model can be used to investigate the effects of increasing braking pressure and changing the contact surface. Moreover, this model can calculate the dynamic responses of the system when an angular velocity is applied to the disc. First, a braking system was tested experimentally several times. Then a finite element model of the structure was created in ANSYS commercial software with defining suitable elements for the contact area between the disc and the pads. In the following, by an identification process a distribution of contact parameters at different braking pressures was obtained. The results shows that when the braking pressure increases, the dynamic responses of the structure increase, as well as the contact stiffness. A further increase in braking pressure does not have much effect on the contact stiffness and the contact area becomes like a new support.

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Bicycle disc brake noise analysis and mitigation

Singh,

Vreman,

Dressel

et al. 2024

Journal of Vibration and Control

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This project was designed to understand the causes and mechanisms of bicycle disc brake noise and use that information to formulate and evaluate possible mitigation techniques. Brake noise was generated by a real bicycle running on a treadmill and recorded by microphone and laser vibrometer. Six independent variables, brake force, rotor thickness, front fork stiffness, weather conditions, spoke tension, and friction coefficient, were varied according to a one-quarter fractional factorial design. A finite element model of the rotor, pads, and calliper was also formulated and analysed. The results of these two methods, particularly the disc mode shapes and frequencies, suggest that doublet mode splitting and reconverging plays a role in noise generation and that changing the rotor mass or breaking its symmetry could interfere with such noise generation. Finally, of these mitigations, breaking disc symmetry proved the most fruitful, with noise magnitude reductions from 72% to 99%, depending on frequency.

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A new prototype system for automated suppression of disc brake squeal

Cited by 3 publications

References 14 publications

The Effects of Corrosion on Particle Emissions from a Grey Cast Iron Brake Disc

The Effects of Corrosion on Particle Emissions from a Grey Cast Iron Brake Disc

Developing an accurate finite element model for brake disc in contact with the pad using experimental modal analysis

Bicycle disc brake noise analysis and mitigation

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