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Record Details

Record 88 of 976
Assessment of Comprehensive Analysis Calculation of Structural Loads on Rotors
Author and Affiliation:
Yeo, Hyeonsoo(Raytheon Information Technology and Scientific Services, Moffett Field, CA, United States)
Johnson, Wayne(NASA Ames Research Center, Moffett Field, CA, United States)
Abstract: Blade 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.
Publication Date: Jan 01, 2004
Document ID:
20050009954
(Acquired Jan 07, 2005)
Subject Category: AIRCRAFT DESIGN, TESTING AND PERFORMANCE
Document Type: Preprint
Meeting Information: American Helicopter Society 60th Annual Forum; 7-10 Jun. 2004; Baltimore, MD; United States
Meeting Sponsor: American Helicopter Society, Inc.
Financial Sponsor: NASA Ames Research Center; Moffett Field, CA, United States
Organization Source: NASA Ames Research Center; Moffett Field, CA, United States
Description: 26p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: BENDING MOMENTS; BO-105 HELICOPTER; FLAPPING; FLIGHT TESTS; ROTORS; WIND TUNNEL TESTS; MODELS; HIGH SPEED; LOADS (FORCES); TRAILERS; VIBRATION; WAKES
Availability Source: Other Sources
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