Thermal Deformation Analysis Of Automotive Disc Brake Squeal

Muhammad Zahir, Hassan (2009) Thermal Deformation Analysis Of Automotive Disc Brake Squeal. PhD thesis, University of Leeds.

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Automotive disc brake squeal has been a major concern in warranty issues and a challenging problem for many years. A variety of tools have been developed which include both experimental studies and numerical modelling technique to tackle the problem. The aim of this project is to develop a validated thermo-mechanical finite element model considering both the mechanical structural compliance and thermal effects in the dynamic instability of a disc brake system leading to squeal. A key issue in the process is to investigate the structural deformation of the brake components due to the combined effect of thermal expansion and contact loading between pad and disc when subjected to temperature change during a typical braking cycle. A new methodology is introduced whereby a fully coupled transient thermo-mechanical analysis is carried out to provide the temperature and contact distributions within the brake before executing an instability analysis using the complex eigenvalue method. A case study is carried out based on a typical passenger car brake as it undergoes a partial simulation of the SAE J2521 drag braking noise test. The actuation pressure, coefficient of friction and vehicle travelling speed are all considered to derive the temperature dependent contact pressure distributions making allowance for the "rotating heat source" effect. An experimental investigation using a brake dynamometer is also carried out to measuring the squealing noise and thermal deformation which leads to a validation of the results predicted by the numerical modelling. It is demonstrated that the fully coupled thermo-mechanical FE model enhances understanding of the time dependent non-linear contact behaviour at the friction interface. This, in turn, demonstrates the fugitive nature of brake squeal through the system eigenvalues that appear and disappear as a function of temperature throughout the braking period. Parametric studies on the geometrical effect and materials of brake components determine the contribution of each of these factors to brake squeal. The approach therefore can be use as a predictive tool to evaluate disc brake squeal using finite element method.

Item Type: Thesis (PhD)
Uncontrolled Keywords: Motor vehicles -- Brakes, Automobiles -- Disc brakes, Motor vehicles -- Disc brakes, Automobiles -- Brakes
Subjects: T Technology > T Technology (General)
T Technology > TL Motor vehicles. Aeronautics. Astronautics
Divisions: Library > Disertasi > FTK
Depositing User: Nor Aini Md. Jali
Date Deposited: 23 Nov 2014 12:50
Last Modified: 28 May 2015 04:31
Statistic Details: View Download Statistic

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