Methodology for Rotorcraft Brownout Mitigation Through Flight Path Optimization
| Autor: | J. Gordon Leishman, Roberto Celi, John Tritschler |
|---|---|
| Rok vydání: | 2014 |
| Předmět: |
Engineering
Brownout business.industry Rotor (electric) Applied Mathematics Vortex ring state Aerospace Engineering Wake Stability derivatives law.invention Vortex Downwash Space and Planetary Science Control and Systems Engineering Control theory law Electrical and Electronic Engineering Aerospace engineering business Helicopter height–velocity diagram |
| Zdroj: | Journal of Guidance, Control, and Dynamics. 37:1524-1538 |
| ISSN: | 1533-3884 0731-5090 |
| DOI: | 10.2514/1.g000330 |
| Popis: | A methodology is presented for the selection of approach-to-landing maneuvers that may result in improved brownout characteristics. The methodology is based upon a brownout metric that assesses the relative brownout cloud volume densities in critical regions of the pilot’s field of view. The metric becomes the objective function of a procedure in which a typical visual approach profile is parameterized and optimized to minimize brownout in a representative landing maneuver. The optimization is constrained to avoid maneuvers that would be conducive to the onset of vortex ring state or would result in flight within the “avoid” regions of a typical helicopter height–velocity diagram. The analysis uses a free-vortex wake model and simulates the dynamics of the dust particles immersed in the rotor downwash. The results show that the optimal approach trajectories affect the resulting flowfield, particularly the development of a ground vortex ahead of the rotor disk, which influences the rate of development, siz... |
| Databáze: | OpenAIRE |
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