1. Random gust response statistics for coupled torsion-flapping rotor blade vibrations
- Author
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S. K. Yin, Kurt H. Hohenemser, and G. H. Gaonkar
- Subjects
Engineering ,Torsional vibration ,Turbulence ,business.industry ,Stochastic process ,Aerospace Engineering ,Torsion (mechanics) ,Structural engineering ,musculoskeletal system ,body regions ,Physics::Fluid Dynamics ,Vibration ,surgical procedures, operative ,Mathematics::K-Theory and Homology ,biological sciences ,otorhinolaryngologic diseases ,Flapping ,Atmospheric turbulence ,Advance ratio ,business - Abstract
An analysis of coupled torsion-flapping rotor blade vibrations in response to atmospheric turbulence revealed that at high rotor advance ratios anticipated for future high speed pure or convertible rotorcraft both flapping and torsional vibrations can be severe. While appropriate feedback systems can alleviate flapping, they have little effect on torsion. Dynamic stability margins have also no substantial influence on dynamic torsion loads. The only effective means found to alleviate turbulence caused torsional vibrations and loads at high advance ratio was a substantial torsional stiffness margin with respect to local static torsional divergence of the retreating blade.
- Published
- 1972
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