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Dynamic Modeling of Brake Friction Coefficients
Technical Paper
2000-01-2753
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Friction behavior is one of the most critical factors in brake system design and performance. For up-front design and system modeling it is desirable to be able to describe a lining's frictional behavior as a function of the local conditions, such as contact pressure, temperature and sliding speed. Typically, frictional performance is assessed using brake dynamometer testing of full-scale hardware, and an average friction value is used during brake system development. This traditional approach yields an average brake friction coefficient that is hardware-dependent and fails to capture in-stop friction variation; it is also unavailable in advance of component testing, ruling out true up-front design and prediction.
To address these shortcomings, a scaled inertial brake dynamometer was used to determine the frictional characteristics of candidate lining materials. Dynamic modeling techniques were then applied to develop a hardware-independent, empirical friction function with respect to contact load, rotor temperature and rotor speed. It was demonstrated that a growth model can be used for dynamic prediction of the instantaneous friction coefficient and rotor temperature during simulated braking events. Nonlinear regression and numerical optimization techniques were applied to solve the dynamic equations that describe local friction and temperature as a function of initial load.
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Authors
Citation
Loh, W., Basch, R., Li, D., and Sanders, P., "Dynamic Modeling of Brake Friction Coefficients," SAE Technical Paper 2000-01-2753, 2000, https://doi.org/10.4271/2000-01-2753.Also In
SAE 2000 Transactions Journal of Passenger Cars - Mechanical Systems
Number: V109-6; Published: 2001-09-15
Number: V109-6; Published: 2001-09-15
SAE 2001 Transactions Journal of Passenger Cars - Mechanical Systems
Number: V110-6; Published: 2002-09-15
Number: V110-6; Published: 2002-09-15
References
- Anderson A. E. Gratch S. Hayes H. “A New Laboratory Friction and Wear Test for the Characterization of Brake Linings,” SAE 670079 Society of Automotive Engineers NY, NY 1967
- Burkman A. J. Highly F. H. “Laboratory evaluation of brake lining materials,” SAE Paper 670510 1967
- Neuman R. F. Urban J. A. McNinch J. H. “Performance characterization of dry friction materials,” Braking of Road Vehicles I. Mech. E. Conference Publications Mechanical Engineering Publications Ltd London 1983 233 238
- Wilson A. J. Belford W. G. Bowsher G. T. “Scaled Vehicle Brake Installations for Friction Material Assessment,” Lucas Engineering Review 4 1 January 1968
- Preston J. D. Forthofer R. J. “Correlation of Vehicle, Dynamometer and Other Laboratory Tests for Brake Friction Materials,” SAE 710250 Society of Automotive Engineers NY, NY 1971
- Oldershaw R. M. Prestidge A. F. Birkmyre R. C. “Brake Road Testing in the Laboratory,” SAE 730563 Society of Automotive Engineers NY, NY 1973
- Banks R. B. “Growth and Diffusion Phenomena: Mathematical Frameworks and Applications” Spring-Verlag New York 1994