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.
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Hrishikesh P. KHAIRNAR. He is a research scholar and faculty at VJTI. He received his master degree in engineering at VJTI in 2005 and joined VJTI as faculty in 2008. His teaching experience encapsulates subjects of automotive power transmission systems and mechatronics. Currently he is a doctor candidate in the area of “friction modeling of automotive brakes” since 2012 in quest to improve automotive safety.
Vikas M. PHALLE. He obtained his ME degree from VJTI in 2004 and Ph.D degree at IIT Roorkee in 2011 pertaining to the area “performance analysis of fluid film journal bearing”. He has 20 years teaching experience and his research work has been recognized at international level with more than 45 research papers in reputed and high impact factor international and national Journals. He is also the reviewer of many international peer review journals. Recently he presented paper at STLE Annual Meeting at Dallas, USA, 2015.
Shankar S. MANTHA. He is an eminent academician and an able administrator. He obtained his ME degree at VJTI. His Ph.D research pertained to the area of “combustion modeling”. His passion for developing the IT solutions for the transperancy in government and speedy approval process vindicated in the projects for the state of Maharashtra, and Municipal Corporations. His stint at All India Council for Technical education (Country’s leading regulatory body for engineering colleges) since March 2009 as Vice-Chairman and August 2009 as Chairman was an attempt to expedite the process of approvals and enabling accountability. He has more than 175 publications in international journals and conferences to his credit and 12 Ph.D students who have completed their Ph.D research.
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Khairnar, H.P., Phalle, V.M. & Mantha, S.S. Estimation of automotive brake drum-shoe interface friction coefficient under varying conditions of longitudinal forces using Simulink. Friction 3, 214–227 (2015). https://doi.org/10.1007/s40544-015-0082-6
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DOI: https://doi.org/10.1007/s40544-015-0082-6