High-Speed Rotor Dynamics - An Assessment of Current Technology for Small Turboshaft Engines
ARMY AIR MOBILITY RESEARCH AND DEVELOPMENT LAB FORT EUSTIS VA EUSTIS DIRECTORATE
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Problem areas connected with rotor dynamics which are peculiar to the special requirements of rotor-bearing systems in the class of small turboshaft engines being developed for U.S. Army helicopters are identified. The present and past philosophy of design is discussed, including the impact of the demand for front drives. Methods for critical speed prediction and high-speed balancing are reviewed. The trend to higher speeds is seen to require consideration of new approaches to balancing through flexural modes. The major parameters available for control by the designer are shown to be the bearing support properties, and recommendations are made for improving the accuracy of prediction of these properties.
- Jet and Gas Turbine Engines