科研之友
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摘要
A new model for blade-vortex interaction (BVI) noise generation during maneuvering flight is developed. Acoustic and performance data from both flight and wind tunnel tests are used to derive a nondimensional and analytical performance/acoustic model that describes BVI noise in steady flight. The model is extended to transient maneuvering flight (pure pitch and roll transients) by using quasi-steady assumptions throughout the prescribed maneuvers. Ground noise measurements, taken during maneuvering flight of a Bell 206B helicopter, show that many of the noise radiation details are captured. The result is a computationally efficient BVI noise model with sufficient accuracy to account for transient maneuvering flight. The code can be run in real time to predict transient maneuver noise and is suitable for use in an acoustic mission planning tool.
- 出版日期2015-4
