정지 비행 시 틸트 로터에서 발생하는 소음 예측Noise Prediction of Hovering Tilt Rotor

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Tilt rotor aircraft was developed for satisfying VSTOL (vertical short take off and landing) capability and cruise performance. However the noise generated by tilt rotor system causes one of the most serious problems. In this paper, noise characteristics of tilt rotor system in hovering flight are predicted by using free wake method and Lowson's formula. The flow field of the tilt rotor is simulated by using time marching free wake method, and the free field acoustic pressure is calculated through Lowson's formula. The predicted results are compared with experimental data at various observing positions. In the near field, they show good agreement with experimental data regardless of rotating speed and collective pitch angles of 6, 8 and 10 degree, although there are some discrepancies between prediction and experiment in the far field and at the rotating axis in the near field. It seems that the reason of these discrepancies is difference of unsteady force fluctuation between experiment and calculation.
Publisher
한국소음진동공학회
Issue Date
2005-05-01
Language
KOR
Citation

한국소음진동공학회 춘계학술대회, pp.821 - 825

URI
http://hdl.handle.net/10203/151921
Appears in Collection
AE-Conference Papers(학술회의논문)
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