An Investigation of In-Plane Vibration Modes in Disc Brake Squeal Noise

Disc brake squeal can be classified as a form of friction-induced vibration. Eliminating brake noise is a classic challenge in the automotive industry. This paper presents methods for analyzing the unstable vibration of a car disc brake. The numerical simulation has been conducted, and its results are compared with those from the experimental tests. The root causes of brake squeal noise will be identified. Potential solutions for elimination of the brake squeal noise will be proposed. Firstly, new materials and technologies for the disc brake application will be explored, secondly, it will be illustrated how to avoid the brake squeal noise problem from the brake system design. Brake disc design changes for improving cooling performance, and service solutions for brake squeal noise will be presented.

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Effects of External Hard Particles on Brake Noise of Disc Braking System

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.388.213 ◽

2013 ◽

Vol 388 ◽

pp. 213-216 ◽

Cited By ~ 5

Author(s):

M.A. Nasaruddin ◽

Mohd Kameil Abdul Hamid ◽

Ahmad Razimi Mat Lazim ◽

Abd Rahim Abu Bakar

Keyword(s):

Sound Level ◽

Fast Fourier Transformation ◽

Disc Brake ◽

Brake Squeal ◽

Rotating Disc ◽

Open Design ◽

Hard Particles ◽

Noise Data ◽

Brake Dynamometer ◽

Squeal Noise

The open design and position of disc brake that is closed to road surfaces enable contaminants to enter the brake gap and caused noise and tribological disturbance at the brake interface. Contaminants such as dirt and soil can be present and are expected to influence the occurrence of brake squeal that produce an annoying sound during braking action. The objective of this study was to examine the effect of external hard particles at different disc sliding speed on generation of brake squeal using a brake dynamometer. Different rotational speed of disc brake was selected and the experiments squeal noise data was collected and analyzed using the Fast Fourier Transformation (FFT) analyzer. From the experiments, the presence of external particle and the rotation speed of disc brake promotes the generation of brake squeal phenomenon by changing the surface roughness and effective contact of brake interface. Results obtained from the experiment also showed that higher rotating disc generate higher sound level meter or squeal frequency and increase numbers of squeal noise generated.

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REDUCTION OF DISC BRAKE SQUEAL NOISE USING CONSTRAINED LAYER DAMPERS

Jurnal Teknologi ◽

10.11113/jt.v79.12269 ◽

2017 ◽

Vol 79 (7-4) ◽

Author(s):

S. Arvin Rao ◽

Muhamad Anuwar Jusoh ◽

Abd Rahim Abu Bakar ◽

Mohd Kameil Abdul Hamid ◽

Khidzir Zakaria

Keyword(s):

Standard Procedure ◽

Brake Disc ◽

Hydraulic Pressure ◽

Disc Brake ◽

Butadiene Rubber ◽

Brake Squeal ◽

Noise Test ◽

Prevention Methods ◽

Squeal Noise ◽

Brake Noise

Brakes squeal has remained to be one of the major NVH challenges in brake system design and development. It has been a concern for automotive industry for decade. Brake researchers have proposed many brake squeal reduction and prevention methods in order to overcome and reduce the squeal that emanates from the brake disc systems. In this paper, the effectiveness of constrained layer dampers (CLD) in reducing disc brake squeal noise was investigated. CLD isolates the brake squeal noise through shear deformations of the viscoelastic materials. Two sets of brake tests were conducted using the brake test dynamometer with the application of CLD. Two different types of CLD were used which are three-layer constrained layer damper and four-layer constrained layer damper. Squeal tests were carried out using brake noise test rig based on the global standard procedure SAE J2521. From the test, four-layer CLD configuration works more efficient than three-layer CLD configuration. CLD made up of nitrile butadiene rubber, silicone rubber and mild steel proved to be the most effective noise insulator at hydraulic pressure range of 5 bar to 30 bar and temperature range of 50oC to 200oC with a maximum noise reduction of 11.3 dBA. Thus, CLD technique was proven to be an effective method in reducing brake squeal noise.

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Piezoelectric-based dither control for automobile brake squeal suppression under various braking conditions

Journal of Vibration and Control ◽

10.1177/1077546320956765 ◽

2020 ◽

pp. 107754632095676

Author(s):

HweeKwon Jung ◽

Gyuhae Park ◽

Jeong Kyu Kim

Keyword(s):

Automotive Industry ◽

High Frequency ◽

Experimental Investigations ◽

Disc Brake ◽

Nonlinear Friction ◽

Frequency Range ◽

Brake Squeal ◽

Squeal Noise ◽

Piezoelectric Stack Actuator ◽

Friction Induced Vibration

Automobile brake squeal noise, which is nonlinear, friction-induced vibration in the frequency range 1–16 kHz, still remains a major problem for the automotive industry. This article presents analytical and experimental investigations into the application of dither control for active suppression of automobile disc brake squeal. Dither is a concept of active control that introduces high-frequency actuation into a system to suppress a much lower frequency disturbance. In this study, a specially designed brake system is built, in which a piezoelectric stack actuator in the piston of a floating caliper brake applies the dither input. In the experiments, squeal noise generated under the drag mode and various dynamic modes are considered. The results indicate that this piezoelectric-based dither control could effectively suppress the brake squeal noise by 5–10 dB and the squeal occurrence by up to 60% under various braking conditions.

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Nonlinear Analysis of Friction Induced Vibrations of a Two-degree-of-freedom Model for Disc Brake Squeal Noise.

JSME International Journal Series C ◽

10.1299/jsmec.45.426 ◽

2002 ◽

Vol 45 (2) ◽

pp. 426-432 ◽

Cited By ~ 20

Author(s):

Kihong SHIN ◽

Jae-Eung OH ◽

Michael J. BRENNAN

Keyword(s):

Nonlinear Analysis ◽

Degree Of Freedom ◽

Disc Brake ◽

Brake Squeal ◽

Squeal Noise ◽

Two Degree Of Freedom

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A Study on Low-Frequency Brake Squeal Noise

10.4271/960993 ◽

1996 ◽

Cited By ~ 12

Author(s):

Ichiro Kido ◽

Tuyoshi Kurahachi ◽

Makoto Asai

Keyword(s):

Low Frequency ◽

Brake Squeal ◽

Squeal Noise

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Band Brake Squeal

Journal of Vibration and Acoustics ◽

10.1115/1.2889648 ◽

1996 ◽

Vol 118 (2) ◽

pp. 190-197 ◽

Cited By ~ 10

Author(s):

M. Nakai ◽

M. Yokoi

Keyword(s):

Elastic Foundation ◽

Frictional Force ◽

Linear Analysis ◽

Brake Squeal ◽

Constant Frequency ◽

Squeal Noise ◽

Effective Treatments

The purpose of this paper is to investigate the squealing mechanism of band brakes in order to develop effective treatments for the reduction or elimination of squeal noise. With increasing rotational drum speed, squeal frequency increases up to a constant frequency. This constant squeal frequency coincides precisely with the frequency of instability obtained by a linear analysis of the motion of a band on an elastic foundation when the frictional force between the lining of the band and the drum is taken into account. Through experiments and analyses, it will be demonstrated that squeals are induced by the coupling between two modes of the band.

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