Dynamic Compatibility of Rotary-Wing Aircraft Propulsion Components
ARMY AIR MOBILITY RESEARCH AND DEVELOPMENT LAB FORT EUSTIS VA EUSTIS DIRECTORATE
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A study of problems related to vibration and dynamic loads in helicopter propulsion systems was made. It was found that engine vibration, shaft whirling, and dynamic instabilities seriously limit helicopter performance and reliability. It is recommended that studies be made to justify an intelligent standardization of engine vibration limit specifications for helicopters, that impedance-mobility methods be developed for optimizing engine airframe interface design, that research and development of helicopter power transmission shafts and couplings be carried out to solve whirling problems, and that new methods and hardware be developed to eliminate torsional instabilities in helicopter drive systems with automatic fuel control.