Modelling damping element to reduce disc brake squeal

A disc or drum brake system is very often generating undesirable and annoying squeal noise that can disturb both driver and passengers. In order to prevent or reduce brake squeal noise, structural modifications of brake components, damping layers and active squeal control methods are commonly propos...

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Bibliographic Details
Main Author:	Md. Yusop, Noraide
Format:	Thesis
Language:	English
Published:	2013
Subjects:	TJ Mechanical engineering and machinery
Online Access:	http://eprints.utm.my/id/eprint/39759/5/NoraideMdYusopMFKM2013.pdf
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id	my-utm-ep.39759
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spelling	my-utm-ep.397592017-07-24T01:07:19Z Modelling damping element to reduce disc brake squeal 2013-02 Md. Yusop, Noraide TJ Mechanical engineering and machinery A disc or drum brake system is very often generating undesirable and annoying squeal noise that can disturb both driver and passengers. In order to prevent or reduce brake squeal noise, structural modifications of brake components, damping layers and active squeal control methods are commonly proposed and evaluated by car manufacturers using analytical, numerical and experimental approach. Thus, this thesis attempts to investigate the effectiveness of damping layers such as pad insulator and clip to reduce disc brake squeal noise. In doing so, existing two (pad model) and four (pad-disc model) degrees-of-freedom (DOF) brake models without damping layers are adopted. The mass, stiffness and damping values of these brake models are obtained from the experiments. These two brake models are then validated against a real brake assembly test data and good correlation on the natural and squeal frequency is achieved. Upon obtaining validated brake models, damping layers i.e. the clip and insulator are modelled based on its mass, stiffness and damping. The layers later are embedded into the validated pad and pad-disc models. The parameter properties (stiffness and damping) of these damping layers are measured from modal testing. Complex eigenvalue (CE) and dynamic transient (DT) analyses are performed using MATLAB software package to predict squeal occurrences. The squeal trigger mechanism used in this work is based on mode coupling effect. The brake models with damping layers are simulated at a certain brake parameter range such as friction coefficient, pad-disc contact stiffness and pad wear. From the analysis, it is found that both CE and DT predict squeal frequency close to the measured data with difference less than 4%. It is also found that the pad-disc model is successfully predicting squeal or non-squeal occurrences close to the squeal test results for both with clip and clip-insulator models. However, the pad model is seen not capable to completely replicate the squeal test results particularly with the clip model. This shows that the pad-disc model should be used to predict squeal occurrences. From the parametric studies, it is shown that squeal noise can be 2013-02 Thesis http://eprints.utm.my/id/eprint/39759/ http://eprints.utm.my/id/eprint/39759/5/NoraideMdYusopMFKM2013.pdf application/pdf en public masters Universiti Teknologi Malaysia, Faculty of Mechanical Engineering Faculty of Mechanical Engineering
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	TJ Mechanical engineering and machinery
spellingShingle	TJ Mechanical engineering and machinery Md. Yusop, Noraide Modelling damping element to reduce disc brake squeal
description	A disc or drum brake system is very often generating undesirable and annoying squeal noise that can disturb both driver and passengers. In order to prevent or reduce brake squeal noise, structural modifications of brake components, damping layers and active squeal control methods are commonly proposed and evaluated by car manufacturers using analytical, numerical and experimental approach. Thus, this thesis attempts to investigate the effectiveness of damping layers such as pad insulator and clip to reduce disc brake squeal noise. In doing so, existing two (pad model) and four (pad-disc model) degrees-of-freedom (DOF) brake models without damping layers are adopted. The mass, stiffness and damping values of these brake models are obtained from the experiments. These two brake models are then validated against a real brake assembly test data and good correlation on the natural and squeal frequency is achieved. Upon obtaining validated brake models, damping layers i.e. the clip and insulator are modelled based on its mass, stiffness and damping. The layers later are embedded into the validated pad and pad-disc models. The parameter properties (stiffness and damping) of these damping layers are measured from modal testing. Complex eigenvalue (CE) and dynamic transient (DT) analyses are performed using MATLAB software package to predict squeal occurrences. The squeal trigger mechanism used in this work is based on mode coupling effect. The brake models with damping layers are simulated at a certain brake parameter range such as friction coefficient, pad-disc contact stiffness and pad wear. From the analysis, it is found that both CE and DT predict squeal frequency close to the measured data with difference less than 4%. It is also found that the pad-disc model is successfully predicting squeal or non-squeal occurrences close to the squeal test results for both with clip and clip-insulator models. However, the pad model is seen not capable to completely replicate the squeal test results particularly with the clip model. This shows that the pad-disc model should be used to predict squeal occurrences. From the parametric studies, it is shown that squeal noise can be
format	Thesis
qualification_level	Master's degree
author	Md. Yusop, Noraide
author_facet	Md. Yusop, Noraide
author_sort	Md. Yusop, Noraide
title	Modelling damping element to reduce disc brake squeal
title_short	Modelling damping element to reduce disc brake squeal
title_full	Modelling damping element to reduce disc brake squeal
title_fullStr	Modelling damping element to reduce disc brake squeal
title_full_unstemmed	Modelling damping element to reduce disc brake squeal
title_sort	modelling damping element to reduce disc brake squeal
granting_institution	Universiti Teknologi Malaysia, Faculty of Mechanical Engineering
granting_department	Faculty of Mechanical Engineering
publishDate	2013
url	http://eprints.utm.my/id/eprint/39759/5/NoraideMdYusopMFKM2013.pdf
_version_	1747816549041831936

Modelling damping element to reduce disc brake squeal

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