a Study on the Squeal of a Drum Brake which has Shoes of Non-Uniform Cross-Section
TL;DR: In this paper, a stability analysis of a drum brake, which has shoes of non-uniform cross-section, is performed to find a simple and effective method of reducing the squeal of the drum brake by partially changing the shapes of the shoes.
About: This article is published in Journal of Sound and Vibration.The article was published on 2001-03-08. It has received 27 citations till now. The article focuses on the topics: Drum brake & Brake.
Citations
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TL;DR: In this article, a review of state-of-the-art studies on brake vibration and noise is presented, focusing on the still-open questions that appear crucial from the perspective of a leading brake manufacturer.
Abstract: Several state of the art papers and even books on brake vibration and/or noise have been presented in the literature. Many of them have analytically and sharply accounted for the impressive amount of research undertaken on this topic. This state of the art review focuses on the still-open questions that appear crucial from the perspective of a leading brake manufacturer. The paper deals with the phenomena of brake vibration and/or noise, the experimental and theoretical methods for studying such phenomena, and the actions that are identified to be necessary to definitely solve the addressed problem. Key topics are the modelling of friction, the modelling of the dynamics of the brake as a non-linear system subjected to deterministic or random (parametric) excitation, the proper modelling of the contact between the disc and the pad, and the experimental validation of the mathematical models.
86 citations
01 Jan 2008
TL;DR: Results indicate that the proposed automation method for automatic evaluation of some important measures of risk management can increase the accuracy of the assessment while it is optimizing the time and avoiding human errors.
Abstract: Lack of the management of software risks is one of the main reasons of software project failure. In order to implement proper risk management processes, it is necessary to evaluate risks, based on the specified criteria. The process of the assessment of risks is a time-consuming process in software engineering. So Tools for automated the risks assessment is needed. In this paper, a method for automatic evaluation of some important measures of risk management is provided. Getting the physical address of the project and analyzing line by line is how this method works. In this analysis, the risks between classes and the internal risks of any class discovered using some criteria. These criteria that are used in this method are based on three-tier architecture. Finally, proposed method, provide some quantities which are represent the impact of the risks. For showing the efficiency of this method, a tool named SPRA is implemented. At the end of this paper, a comparison between two out puts is represented, one output is based on the manual method and the second one is the SPRA tools output. These results indicate that the proposed automation method can increase the accuracy of the assessment while it is optimizing the time and avoiding human errors. Keywords— Software risks, risk management, risk assessment automation
44 citations
Cites background or methods from "a Study on the Squeal of a Drum Bra..."
...The friction stiffness acts as the co-called “direct current” spring [23] that causes the stiffness matrix to be asymmetric....
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...Cherkasova et al (2009) [23] proposed a novel framework that provides a powerful solution for automated anomaly detection and analysis of changes in application behavior....
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...In Europe and Japan, such recycling is already widely practiced [23, 24], whereas in the US, it is being accepted only slowly, because the economic drivers are not yet strong enough....
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TL;DR: In this paper, a model with two linear systems coupled at a single-point sliding contact where a general linearised model for dynamic frictional force is allowed is used to examine the origin of the sensitivity of friction-induced vibration.
Abstract: Friction-induced vibration is notoriously twitchy. This paper examines the origin of the sensitivity, using a model with two linear systems coupled at a single-point sliding contact where a general linearised model for dynamic frictional force is allowed. Sensitivity and convergence studies show that system uncertainty is significant enough to affect the stability of predictions and that modes neglected from the model can sensitively affect predictions. Some key results from a large-scale experimental study are presented. The integration of the uncertainty and sensitivity analysis with data-processing techniques to extract reliable data allows critical evaluation of the modelling details.
25 citations
Cites background from "a Study on the Squeal of a Drum Bra..."
...Lee et al. (2001) developed a model of a drum brake: of most interest here was the recognition of the sensitive dependence of the predictions to small parameter changes....
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TL;DR: In this article, the authors modelled the drum brake squeal as friction excited vibration based on the binary flutter mechanism, which required the convergence of two modes experimentally identified using Modal Assurance Criterion.
21 citations
31 Oct 2006
13 citations
References
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TL;DR: In this paper, a phenomenological model is proposed which combines the concepts of static and dynamic friction, which seems intuitively reasonable and for which there is documented evidence, to develop a dynamical systems understanding of the phenomenon of squeal.
96 citations
14 Sep 1997
30 citations
24 citations
15 Jun 1989-JSME international journal. Series 3, Vibration, control engineering, engineering for industry
TL;DR: In this paper, the authors considered an improved analytical model in order to clarify a practical method of eliminating brake squeal by adopting a material with a low coefficient of friction, varying the boundary conditions of the brake shoe and changing the position of the lining.
Abstract: Recently, a theoretical analysis of drum brake squeal was presented by N. Millner. This report has been quoted in many papers. We considered an improved analytical model in order to clarify a practical method of eliminating brake squeal. We obtained an equation which represents E, the increase of kinetic energy during 1 cycle. The equation for E often becomes positive under the influence of coupled vibrations between radial and tangential directions in the brake shoe and brake drum. Brake squeal is generated under the condition E>0. The factors having an influence on brake squeal were clarified by considering the above equation for E. In accordance with the above considerations it is shown that adopting a material with a low coefficient of friction, varying the boundary conditions of the brake shoe, and changing the position of the lining are effective in eliminating brake noise.
20 citations
01 Nov 1993
19 citations