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Investigation of Rotor Performance and Loads of a UH-60A Individual Blade Control SystemWind tunnel measurements of performance, loads, and vibration of a full-scale UH-60A Black Hawk main rotor with an individual blade control (IBC) system are compared with calculations obtained using the comprehensive helicopter analysis CAMRAD II and a coupled CAMRAD II/OVERFLOW 2 analysis. Measured data show a 5.1% rotor power reduction (8.6% rotor lift to effective-drag ratio increase) using 2/rev IBC actuation with 2.0 amplitude at = 0.4. At the optimum IBC phase for rotor performance, IBC actuator force (pitch link force) decreased, and neither flap nor chord bending moments changed significantly. CAMRAD II predicts the rotor power variations with the IBC phase reasonably well at = 0.35. However, the correlation degrades at = 0.4. Coupled CAMRAD II/OVERFLOW 2 shows excellent correlation with the measured rotor power variations with the IBC phase at both = 0.35 and = 0.4. Maximum reduction of IBC actuator force is better predicted with CAMRAD II, but general trends are better captured with the coupled analysis. The correlation of vibratory hub loads is generally poor by both methods, although the coupled analysis somewhat captures general trends.
Document ID
20120006553
Acquisition Source
Ames Research Center
Document Type
Reprint (Version printed in journal)
External Source(s)
doi:10.4050/JAHS.56.042006
Authors
Yeo, Hyeonsoo (Army Research Development and Engineering Command Moffett Field, CA, United States)
Romander, Ethan A. (NASA Ames Research Center Moffett Field, CA, United States)
Norman, Thomas R. (NASA Ames Research Center Moffett Field, CA, United States)
Date Acquired
August 25, 2013
Publication Date
October 1, 2011
Publication Information
Publication: Journal of the American Helicopter Society
Volume: 46
Issue: 4
Subject Category
Aeronautics (General)
Report/Patent Number
ARC-E-DAA-TN4300
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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