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Vibratory Loads/Stress Analysis and Fatigue Alleviation with Rotorcraft Comprehensive Modeling Tool

Dooyong Lee, Chengjian He, Advanced Rotorcraft Technology Inc.
Mulugeta Haile, US Army Research Lab

https://doi.org/10.4050/F-0079-2023-18163

Abstract:
The primary cause of rotorcraft component fatigue is the vibratory loads from the rotors. Rotorcraft constantly experience time varying loads even in steady state flight. The source of excitation is the unsteady airloads due to the combined effect of rotor rotation and flight speed. In aggressive flight maneuvers, critical loads are experienced, which may induce large structural stress response and, hence, severely impact the fatigue life of certain critical structural components (e.g., swashplate control pitch link, rotor blades, etc). This paper addresses the application of the FLIGHTLAB high fidelity comprehensive modeling and analysis tool to rotorcraft vibratory loads and stress analysis and active control methods for fatigue alleviation. Through this study, a fatigue reduction controller was designed. The prototyped controller was integrated with FLIGHTLAB and the effectiveness of the control method for fatigue reduction was tested and evaluated for selected critical rotor components (e.g., blade, hub, and pitch link) and flight maneuver conditions.


Vibratory Loads/Stress Analysis and Fatigue Alleviation with Rotorcraft Comprehensive Modeling Tool

  • Presented at Forum 79 - Best Paper for this session
  • 15 pages
  • SKU # : F-0079-2023-18163
  • Structures and Materials

  • Your Price : $30.00
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Vibratory Loads/Stress Analysis and Fatigue Alleviation with Rotorcraft Comprehensive Modeling Tool

Authors / Details:
Dooyong Lee, Chengjian He, Advanced Rotorcraft Technology Inc.
Mulugeta Haile, US Army Research Lab