Publication Date:
2019-07-13
Description:
An acoustics parametric analysis of the effect of fuselage drag and pitching moment on the Blade-Vortex Interaction (BVI) noise radiated by a medium lift helicopter (S-70UH-60) in a descending flight condition was conducted. The comprehensive analysis CAMRAD II was used for the calculation of vehicle trim, wake geometry and integrated air loads on the blade. The acoustics prediction code PSU-WOPWOP was used for calculating acoustic pressure signatures for a hemispherical grid centered at the hub. This paper revisits the concept of the X-force controller for BVI noise reduction, and investigates its effectiveness on an S-70 helicopter. The analysis showed that further BVI noise reductions were achievable by controlling the fuselage pitching moment. Reductions in excess of 6 dB of the peak BVI noise radiated towards the ground were demonstrated by compounding the effect of airframe drag and pitching moment simultaneously.
Keywords:
Acoustics; Aeronautics (General)
Type:
ARC-E-DAA-TN28912
,
American Helicopter Society (AHS) Technical Meeting on Aeromechanics Design for Vertical Lift; Jan 20, 2016 - Jan 22, 2016; San Francisco, CA; United States
Format:
application/pdf
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