The Effect of Grease on Brake Squeal

Shimizu, Hidetoshi; Oura, Yasunori; Suzuki, Tatsuya; Sano, Yoshinori

doi:10.4271/2014-01-2512

Cited by 5 publications

(1 citation statement)

References 12 publications

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“…This includes geometry modifications, 4 adoption of appropriate materials 5,6 or adding components to modify vibrational performance, such as damping shims or grease. 7 A passive approach may sound justifiable as it minimises the brake system complexity, thereby total mass and costs, but it might fail to reduce squeal if the environmental or brake system conditions change.…”

Section: Introductionmentioning

confidence: 99%

A new prototype system for automated suppression of disc brake squeal

Budinsky

Brooks

Barton

2020

Proceedings of the Institution of Mechanical Engineers, Part D:

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This paper presents a new prototype system capable of automated disc brake squeal suppression using a method of varying the leading and trailing piston pressures in a multi-piston opposed brake caliper. The new system consists of a novel modular four-piston brake caliper, a two-channel brake actuation system and an advanced control system that is capable of varying the leading/trailing pressure ratio (LTPR) when squeal is detected. The amended LTPR results in movement of the centre of pressure (CoP) position at the pad/disc interface, which leads to new dynamic parameters of the brake system and thereby to different squeal propensity. Moreover, the control system maintains the overall brake torque at a constant value, so the variation of the LTPR on the brake performance is minimised. Experiments using the current disc brake setup showed that by varying the LTPR, thereby changing the CoP position, the squeal occurrence can be successfully controlled. Large leading or trailing offsets typically lead to a quieter brake. Tests demonstrating operation of the proposed squeal control system in an automatic mode reduced the squeal occurrence significantly for a given duty cycle.

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Section: Introductionmentioning

confidence: 99%

A new prototype system for automated suppression of disc brake squeal

Budinsky

Brooks

Barton

2020

Proceedings of the Institution of Mechanical Engineers, Part D:

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Linear and Nonlinear Stability Analysis of a Fixed Caliper Brake During Forward and Backward Driving

Stump

Nunes

Häsler

et al. 2019

Journal of Vibration and Acoustics

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The parking maneuver of a passenger car is known by bench and vehicle testers to sometimes produce brake squeal, even though the brake system is otherwise quiet. This phenomenon is examined in this work. Pressure foil measurements at the pad caliper contact and acceleration measurements are done on a real break system in order to better understand the mechanisms of the forward–backward driving maneuver. The contact area at the caliper is under a large change during a forward and backward driving maneuver. The measurements motivate linear and nonlinear simulations. A proposal has been made to include the linear effects of parking into the standard robustness analysis with the complex eigenvalues calculation. A time integration of the full nonlinear system shows a possible stable limit cycle, when the brake pad moves from the leading to the trailing side, like in a parking maneuver. This growth of amplitude is not anticipated from the complex eigenvalue analysis (CEA), because no instable eigenvalue is found in the linearized equation of motion at that working point. This subcritical flutter-type behavior is known for small models in the literature and is examined in this paper with a more realistic brake system. It is found that the resulting error of the linearization cannot be neglected. Furthermore, different initial conditions are analyzed to narrow the zone of attraction of the stable limit cycle and the decrease of the critical friction value due to this kind of bifurcation behavior.

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Modal Coupling in Presence of Dry Friction

Simone

Guida

2018

Machines

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Abstract:In this paper, we analyze the behavior of a single pad system in the presence of dry friction. The goal is to investigate the path that leads a stable mechanical system to unstable behavior. In doing so, we studied the behavior of a discrete three DOF model, a continuous model and a finite element model of the pad. The numerical results are consistent with the experimental investigation conducted on a brake disk for railway application.

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The Effect of Grease on Brake Squeal

Cited by 5 publications

References 12 publications

A new prototype system for automated suppression of disc brake squeal

A new prototype system for automated suppression of disc brake squeal

Linear and Nonlinear Stability Analysis of a Fixed Caliper Brake During Forward and Backward Driving

Modal Coupling in Presence of Dry Friction

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