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Brake Road Testing in the Laboratory
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English
Abstract
The paper illustrates the high degree of correlation now attainable with practical vehicle test results, using a reduced-scale dynamometer. The techniques for achieving this state-of-the-art are described in relation to the parameters generally known to influence vehicle/laboratory correlation. As a result of the investigation, the following additional parameters are submitted: history of pad use, correct temperature/time simulation of the car by the machine, and rate of work input during a test. The simulation item is the subject of a special study in which the thermal conditions in a brake are examined on an analog computer by means of a 2 d.f. model.
A discussion of the possible applications of the scale dynamometer leads to the conclusion that a machine could now be developed to provide meaningful data on linings for the use of friction material, brake, and vehicle manufacturers, as well as legislators.
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Citation
Oldershaw, R., Prestidge, A., and Birkmyre, R., "Brake Road Testing in the Laboratory," SAE Technical Paper 730563, 1973, https://doi.org/10.4271/730563.Also In
References
- Hatch D. Goddard E. J. “Design Parameters of a Machine Suitable for Testing Automotive Friction Materials.” Proc. Auto. Div. Inst. Mech. Engrs. 181 1966-1967
- Rusnak R. M. Spurgeon W. M. Aldrich F. W. “Friction Material Testing.” SAE Transactions 79 1970 700517
- Wilson A. J. Bowsher G. T. “Evaluation of Scale Testing of Brake Lining Materials.” Lucas Engr. Rev. 5 4 May 1972
- Livsey A. E. Prestidge A. F. Woor D. F. “A Test Schedule for Passenger Car Brakes.” Proc. Auto. Div. Inst. Mech. Engrs. 1960-1961 7 221 230
- Newcomb T. P. Millner N. “Cooling Rates of Brake Drums and Discs.” Proc. Auto. Div. Inst. Mech. Engrs. 180 1965-1966