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Research Article | Open Access

Estimation of automotive brake drum−shoe interface friction coefficient under varying conditions of longitudinal forces using Simulink

H. P. KHAIRNAR1( ), V. M. PHALLE2, S. S. MANTHA3
Mechanical Engineering Department, VJTI, Mumbai, India
Mechanical Engineering Department,VJTI, Mumbai, India
All India Council of Technical Education, New Delhi, India
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Abstract

The suitable brake torque at the shoe–drum interface is the prerequisite of the active safety control. Estimation of accurate brake torque under varying conditions is predominantly the function of friction coefficient at the shoe–drum interface. The extracted friction coefficient has been used in the antilock braking system (ABS) algorithm to plot the µ–slip curve. The longitudinal forces like Coulomb friction force, contact force and actuating forces at the shoe ends are resolved under the equilibrium condition. The computation of the friction coefficient is presented for the symmetric and asymmetric length of the drum shoes to track the variations in the longitudinal forces. The classical mechanics formulae considering friction are simulated using virtual environment in Matlab/Simulink for the distribution of the Coulomb force. The dual air braking system set up operated at the 8 bar pressure is used to acquire data for the input parameters like distance of Coulomb friction force, distance of pivot point, and contact force applied. The evolved estimation algorithm extracted the maximum friction coefficient of 0.7 for the normal force arrangement of the contact force at the symmetric shoe length, while friction coefficient in the range of 0.3–0.7 is obtained at the asymmetric shoe length.

Keywords

friction coefficientCoulomb friction forcedrum brakescontact force.

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Friction
Volume 3 Issue 3,
September 2015
Pages 214-227
DOI: 10.1007/s40544-015-0082-6
Cite this article:
KHAIRNAR HP, PHALLE VM, MANTHA SS. Estimation of automotive brake drum−shoe interface friction coefficient under varying conditions of longitudinal forces using Simulink. Friction, 2015, 3(3): 214-227. https://doi.org/10.1007/s40544-015-0082-6

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Received: 19 December 2014
Revised: 27 March 2015
Accepted: 11 May 2015
Published: 10 July 2015
© The author(s) 2015

This article is published with open access at Springerlink.com

Open Access: This article is distributed under the terms of the Creative Commons Attribution License which permits any use, distribution, and reproduction in any medium, provided the original author(s) and source are credited.
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