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http://dx.doi.org/10.5139/JKSAS.2013.41.7.561

Fatigue Safe Life Analysis of Helicopter Bearingless Rotor Hub Composite Flexbeam  

Kim, Taejoo (Rotorcraft Technology Division Rotor Department, Korea Aerospace Research Institute)
Kee, Youngjoong (Rotorcraft Technology Division Rotor Department, Korea Aerospace Research Institute)
Kim, Deog-Kwan (Rotorcraft Technology Division Rotor Department, Korea Aerospace Research Institute)
Kim, Seung-Ho (Rotorcraft Technology Division Rotor Department, Korea Aerospace Research Institute)
Publication Information
Journal of the Korean Society for Aeronautical & Space Sciences / v.41, no.7, 2013 , pp. 561-568 More about this Journal
Abstract
After we designed Bearingless rotor hub system for 7,000lb class helicopter, flexbeam fatigue analysis was conducted for validation of requirement life time 8,000 hours. sectional structural analysis method applying elastic beam model was used. Fatigue analysis for two sections of flexbeam which were expected to weak to fatigue damage from result of static analysis was conducted. Extension, bending and torsion stiffness of flexbeam section shape was calculated using VABS for structure analysis. S-N curve of two composite material which composed flexbeam was generated using wohler equation. Load analysis of bearingless rotor system was conducted using CAMRAD II and load analysis result was applied HELIX/FELIX standard load spectrum to generate bearingless rotor system load spectrum which was used flexbeam fatigue safe life analysis.
Keywords
Bearingless Rotor Hub; Flexbeam; Torque-tube; Fatigue Safe Life;
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