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Predicting Landing Gear Carbon Brake Vibration and Performance via Subscale Test and Analysis
Technical Paper
2005-01-3437
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Variation of the coefficient of friction generated in aircraft landing gear brakes can cause vibration or performance problems that damage aircraft or make control of the brake difficult. A means of detecting and predicting the range of such variation is therefore useful during the design stage of a brake. Two causes of stochastic variation, and subscale test methods to characterize the range of variation are presented. A mathematical model is developed that employs the subscale test data to represent the statistical probability of variation in full-scale brake performance. This variability is otherwise difficult to predict or detect due to the improbability of occurrence. Measured flight test brake data is compared with model predictions for two different carbon brake specimens used in full-scale carbon brake designs, and the model is shown to correlate well. An examination of the correlation, and related flight test data indicate that excessive brake torque gain caused by water desorption transition can lead to severe brake performance and vibration problems. The model in this paper enables identification of candidate brake lining materials that have a propensity for these performance problems, and allow them to be eliminated in the brake design stage. Consideration of desorption, and its probability of occurrence, offers insights to improve subscale testing, dynamometer testing, and flight-testing.
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Travis, M., "Predicting Landing Gear Carbon Brake Vibration and Performance via Subscale Test and Analysis," SAE Technical Paper 2005-01-3437, 2005, https://doi.org/10.4271/2005-01-3437.Also In
References
- Tanner, J.A. Travis, M.H. “Adsorption and Desorption effects on Carbon Brake Material Friction and Wear Characteristics” SAE Committee A-5 Meeting New Orleans, LA Apr. 25–28 2005
- Savage, R.H. “Carbon-Brush Contact Films,” General Electric Review October 1945
- Bowden, F.P Young, J.E. “Friction of Diamond, Graphite, and Carbon and the Influence of Surface Films” Cambridge University Press September 24 1951
- Yen, B.K. “Influence of Water Vapor and Oxygen on the Tribology of Carbon Materials with SP 2 Valence Configuration” Wear 192 1996
- Byrne, C. Wang, Z. “Influence of Thermal Properties on the Friction Performance of Carbon Composites.” Carbon 39 1789 1801 2001
- Byrne, C. “Modern Composite Brake Materials” Journal of Composite Materials 38 1837 1850 2004
- Liu, S.Y. Gordon, J.T. Ozbek, M.A. “A Nonlinear Model for Aircraft Brake Squeal Analysis; Part 1: Model Description and Solution Methodology” AIAA paper AIAA-96-1251-CP 406 416 1996
- Liu, S.Y. Gordon, J.T. Ozbek, M.A. “A Nonlinear Model for Aircraft Brake Squeal Analysis; Part II: Stability Analysis and Parametric Studies” AIAA paper AIAA-96-1252-CP 417 426 1996
- Enright, J.J. “Laboratory Simulation of Landing Gear Pitch-Plane Dynamics” SAE, Aerospace Technology Conference and Exposition Long Beach, CA October 14 1985