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Assessment of Comprehensive Analysis Calculation of Structural Loads on RotorsBlade flap bending moments are investigated for six rotors operating at transition and high speeds: H-34 in flight and wind tunnel, SA 330 (research Puma), SA 349/2, UH-60A full-scale, and BO-105 model (HART-I). The measured data from flight and wind tunnel tests are compared with calculations obtained using the comprehensive analysis CAMRAD II. The calculations mere made using two free wake models: rolled-up and multiple-trailer with consolidation models. At transition speed, there is fair to good agreement for the flap bending moment between the test data and analysis for the H-34, research Puma, and SA 349/2 with the rolled-up wake. The calculated flap bending moments differ significantly from measurements for the UH-60A and BO-105. Better correlation is obtained for the UH-60A by using the multiple-trailer with consolidation wake model. Although the multiple-trailer with consolidation wake model shows good correlation on the normal force for the BO-105, the same analysis shows poor correlation on the flap bending moment. In the high speed condition, the analysis shows generally good agreement with the research Puma flight data in both magnitude and phase. However, poor agreement is obtained for the other rotors examined. Although the analysis significantly underpredicts the vibratory normal force on the advancing side for the H-34, the vibratory bending moment correlation is fair to good on both magnitude and phase.
Document ID
20050009954
Acquisition Source
Ames Research Center
Document Type
Conference Paper
Authors
Yeo, Hyeonsoo
(Raytheon Information Technology and Scientific Services Moffett Field, CA, United States)
Johnson, Wayne
(NASA Ames Research Center Moffett Field, CA, United States)
Date Acquired
August 22, 2013
Publication Date
January 1, 2004
Subject Category
Aircraft Design, Testing And Performance
Meeting Information
Meeting: American Helicopter Society 60th Annual Forum
Location: Baltimore, MD
Country: United States
Start Date: June 7, 2004
End Date: June 10, 2004
Sponsors: American Helicopter Society, Inc.
Distribution Limits
Public
Copyright
Other

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