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Fatigue Safe Life Analysis of Helicopter Rotor Bearingless Hub System Composite Components  

Kim, Taejoo (회전익기술팀)
Kee, Youngjoong (회전익기술팀)
Kim, Deog-Kwan (회전익기술팀)
Publication Information
Aerospace Engineering and Technology / v.13, no.1, 2014 , pp. 10-19 More about this Journal
Abstract
We designed bearingless rotor hub system which replace mechanical hinge/bearing with composite beam component and conducted fatigue analysis for flexbeam and torque tube. Extension/bending/torsional stiffness was calculated from 2D section analysis using VABS and 2D section structure analysis was applied for strain calculation. S-N curve of each composite material was generated using Wohler equation and fatigue analysis was conducted on weakness section which was decided from static structure analysis. CAMRAD II was used for load analysis and load analysis result was applied HELIX/FELIX standard load spectrum to generate bearingless rotor system load spectrum which was used fatigue safe life analysis.
Keywords
bearingless hub; flexbeam; torque tube; fatigue safe life; S-N Curve;
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  • Reference
1 FAR-29 Airworthiness Standards: Transport Category Rotorcraft
2 Bielewa, R. L., Cheney, M. C., Jr., and Novak, R. C., "Investigation of a Bearingless Rotor Concept Having a Composite Primary Structure", NASA, 1976, CR-2637
3 Harris, F. D., Cancio, P. A., and Dixon, P. G., "The Bearingless Main Rotor", Third European Rotorcraft and Powered-Lift Aircraft Forum, 1977
4 Helmut, H., "Will Rotor Hubs Lose Their Bearings, A Survey of Bearingless Main Rotor Development", The 18th European Rotorcraft Forum, 1992
5 Li, Leihong, "Structural Design of Composite Rotor Blades with Consideration of Manufacturability, Durability, and Manufacturing Uncertainties", Georgia Institute of Technology, 2008
6 Carlos Cesnik, Rafael Palacios, "UM/VABS Release 1.02 Theoretical Manual", Aerospace Dept - The University of Michigan, 2003
7 Wohler A., "Wohler's experiments on the strength of metals", Engineering, 1867
8 Eurocopter Technical Note
9 Johnson, W., "CAMRAD II Comprehensive Analytical Model of Rotorcraft Aerodynamics and Dynamics", Johnson Aeronautics, Palo Alto, CA, 2007
10 Kee, Y.J., Yun, C.Y., Kim, D.K., and Kim, S.H., "Structural Loads Analysis of Bearingless Helicopter Rotor System", KSAS Fall Conference, 2011, pp 45
11 P.R. Edwards, J. Darts, "Standardized Fatigue Loading sequences for Helicopter Rotors(HELIX and FELIX)", NLR TR 84043 U Part 1 and 2, 1984
12 John Goodman, "Mechanics Applied to Engineering 8th Edition", Longmans Green and Co., 1914 13. M. A. Miner, "Cumulative Damage in Fatigue", Trans. ASME, J. Appl. Mech., Vol 12, 1945, pp159-164
13 M. A. Miner, "Cumulative Damage in Fatigue", Trans. ASME, J. Appl. Mech., Vol 12, 1945, pp159-164