A Study of Squeal Noise in Vehicle Brake System

2011 ◽  
Author(s):  
Xu Wang ◽  
Sabu John ◽  
He Ren
Keyword(s):  
Experimental Tests ◽  
Brake System ◽  
Brake Disc ◽  
Disc Brake ◽  
Brake Squeal ◽  
Design Changes ◽  
Brake Application ◽  
Unstable Vibration ◽  
Squeal Noise ◽  
Brake 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.

REDUCTION OF DISC BRAKE SQUEAL NOISE USING CONSTRAINED LAYER DAMPERS

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.

scholarly journals Influence of Material-Dependent Damping on Brake Squeal in a Specific Disc Brake System

2021 ◽  
Vol 11 (6) ◽  
pp. 2625
Author(s):  
Juraj Úradníček ◽  
Miloš Musil ◽  
L’uboš Gašparovič ◽  
Michal Bachratý
Keyword(s):  
Dynamic Instability ◽  
Friction Material ◽  
System Stability ◽  
Brake System ◽  
Brake Disc ◽  
Disc Brake ◽  
Fe Model ◽  
Brake Squeal ◽  
Friction Forces ◽  
General Material

The connection of two phenomena, nonconservative friction forces and dissipation-induced instability, can lead to many interesting engineering problems. We study the general material-dependent damping influence on the dynamic instability of disc brake systems leading to brake squeal. The effect of general damping is demonstrated on minimal and complex models of a disc brake. Experimental analyses through the frequency response function (FRF) show different damping of the brake system coalescent modes, indicating possible dissipation-induced instability. A complex system including material-dependent damping is defined in commercial finite element (FE) software. A FE model validated by experimental data on the brake-disc test bench is used to compute the influence of a pad and disc damping variations on the system stability using complexe igenvalue analysis (CEVA). Numerical analyses show a significant sensitivity of the experimentally verified unstable mode of the system to the ratio of the damping between the disc and the friction material components.

Generalized Theory of Brake Noise

1993 ◽  
Vol 207 (3) ◽  
pp. 195-202 ◽  
Author(s):  
M Nishiwaki
Keyword(s):  
Friction Force ◽  
Dynamic Instability ◽  
Equations Of Motion ◽  
The Other ◽  
Disc Brake ◽  
Brake Squeal ◽  
Drum Brake ◽  
Brake Application ◽  
Brake Noise ◽  
Theoretical Analyses

Eliminating brake noises generated during brake application is an important issue in the improvement of comfort in vehicles. Brake noises (frequency 1–15 kHz) are often called brake squeal. On the other hand, brake noises (frequency 200–500 Hz) are often called brake groan noise. The studies on drum brake squeal, disc brake squeal and disc brake groan noise have already been presented in references (2), (3) and (4), where theoretical analyses on these brake noises were described. This paper shows that the equations of motion are represented by the same type of equations. Based on these analyses. It is clear that drum brake squeal, disc squeal and disc brake groan noise are generated by the same cause—dynamic instability of the brake system with friction force variations.

The effect of damping of the disc brake squeal noise

2000 ◽  
Vol 108 (5) ◽  
pp. 2527-2527
Author(s):  
Kihong Shin ◽  
Jae‐Eung Oh ◽  
Wootaek Kim ◽  
Mike Brennan
Keyword(s):  
Disc Brake ◽  
Brake Squeal ◽  
Squeal Noise

scholarly journals Squeal Frequency of a Railway Disc Brake Evaluation by FE Analyses

2018 ◽  
Vol 2018 ◽  
pp. 1-10 ◽  
Author(s):  
F. Cascetta ◽  
F. Caputo ◽  
A. De Luca
Keyword(s):  
Sensitivity Analysis ◽  
Finite Element ◽  
Experimental Tests ◽  
Numerical Approach ◽  
System Stability ◽  
Brake System ◽  
Physical Parameters ◽  
Disc Brake ◽  
Complex Eigenvalues ◽  
The Stability

This paper deals with the development of a numerical model, based on the Finite Element (FE) theory for the prediction of the squeal frequency of a railway disc brake. The analytical background has been discussed and presented, as well as the most efficient methods for evaluating the system stability; the attention has been paid particularly to the complex eigenvalues method, which has been adopted within this paper to investigate the railway disc brake system. Numerical results have been compared with measurements from experimental tests in order to validate the proposed numerical approach. At the end of this work, a sensitivity analysis, aimed at understanding the effects of some physical parameters influencing the stability of the brake system and the squeal propensity, has been carried out.

Optimizing Proportions of Railway Brake Discs by Temperature Transients Evaluation

1988 ◽  
Vol 202 (2) ◽  
pp. 91-99 ◽  
Author(s):  
S Missori ◽  
A Sili
Keyword(s):  
Thermal Cycle ◽  
Brake Disc ◽  
Disc Brake ◽  
Simple Method ◽  
Brake Discs ◽  
Brake Application ◽  
Dimensional Parameters ◽  
Maximum Temperatures ◽  
Commercial Size

When evaluating the performances of railway brake discs, the ability to accumulate and spread heat to the air plays a major role, since wear of synthetic lining and disc deterioration are strongly dependent on maximum temperatures attained on the surface in contact with the friction pad. The energy developed during brake application gives rise to an increase of disc temperature, which can be correlated to braking power, braking sequences and durations and to disc features. Maximum temperatures are attained on the friction surface of the disc. Determination of the thermal cycle subsequent to brake application can be considered preliminary to the study of lining and disc wear. The present work proposes a simple method using finite difference numerical analysis to evaluate the efficiency of the brake disc in dissipating the heat, both on a constant speed and an up-to-stop brake application. The effect of the various dimensional parameters, such as number of ribs, disc thickness and ribs width, is considered with the aim of achieving a first rough optimization of the required size of disc brake. The results related to a commercial size disc brake are given.

The Study of Disc Brake Noise on Three Different Types of Friction Materials

2014 ◽  
Vol 663 ◽  
pp. 113-118 ◽  
Author(s):  
Ahmad Razimi Mat Lazim ◽  
Abd Rahim Abu Bakar ◽  
Mohamed Kchaou
Keyword(s):  
Friction Material ◽  
Pressure Level ◽  
Material Composition ◽  
Disc Brake ◽  
The Road ◽  
Before And After ◽  
Squeal Noise ◽  
The Relationship ◽  
Brake Noise ◽  
Brake Friction Material

This work investigates the effect of road grit particles and material compositions on disc brake squeal noise. Three different Non Asbestos Organic (NAO) brake pad samples and road particles with a size range between 400 μm to 500 μm are used in the squeal experiment. The relationship between the existence of road particle with the noise occurrence were studied through the change in pressure level, friction coefficient (CoF), sound pressure level (SPL) and material composition. The material compositions were analyzed before and after squealing condition using energy dispersive X-ray analysis (EDX). Result has shown the road particles contribute to the emission of squeal noise and the increasing of some material composition of brake friction material components.

Modification of Doublet Modes in a Circular Disc Constrained by Cyclic Symmetric Features

2015 ◽  
Author(s):  
Sung-Han Tsai ◽  
Jen-Yuan (James) Chang
Keyword(s):  
Engineering Application ◽  
Circular Disc ◽  
Brake System ◽  
Brake Disc ◽  
Geometry Design ◽  
Cyclic Symmetric ◽  
Parametric Studies ◽  
Design Perspective ◽  
Squeal Noise ◽  
New Criterion

From design perspective, structural modification including material modification and geometry modification in a brake system is the most common approach in reducing the brake squeal. Research of this paper will focus on the modification of the largest noise-generating part in motorcycle’s brake system-the circular disc rotor, based on an existing product available in Taiwan. To reach the best geometry design of a circular disc rotor for specific vibration reduction criteria, parametric studies will be carried out in understanding effects of two evenly distributed modifications in the disc — the bolts and ribs. This paper aims to find a criterion in dealing with the design of a pattern on a disk through finite element analyses and experimental modal analyses. From which results, a new criterion for frequency splitting is developed and a mode-veering phenomenon is observed. The outcome has engineering application in reducing specific squeal noise caused by split doublet modes and shifting natural frequencies of a brake disc without creating a new one.

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

2005 ◽  
Author(s):  
Antti Papinniemi ◽  
Jiye Zhao ◽  
Daniel Stanef ◽  
Jim Ding
Keyword(s):  
Disc Brake ◽  
Vibration Modes ◽  
Brake Squeal ◽  
Plane Vibration ◽  
Squeal Noise
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