Analysis of a higher harmonic control test to reduce blade vortex interaction noise

1994 ◽  
Vol 31 (6) ◽  
pp. 1341-1349 ◽  
Author(s):  
Thomas F. Brooks ◽  
Earl R. Booth ◽  
D. Douglas Boyd ◽  
Wolf R. Splettstoesser ◽  
Klaus J. Schultz ◽  
...  
Keyword(s):  
Control Test ◽  
Vortex Interaction ◽  
Harmonic Control ◽  
Blade Vortex Interaction ◽  
Higher Harmonic Control ◽  
Higher Harmonic

Prediction of Blade-Vortex Interaction Airloads With Higher-Harmonic Pitch Controls Using the 2GCHAS Comprehensive Code

2001 ◽  
Vol 123 (4) ◽  
pp. 469-474 ◽  
Author(s):  
Joon W. Lim ◽  
Chee Tung ◽  
Yung H. Yu
Keyword(s):  
Tip Vortex ◽  
Vortex Interaction ◽  
Main Rotor ◽  
Scaled Model ◽  
Harmonic Control ◽  
Blade Vortex Interaction ◽  
Higher Harmonic Control ◽  
Blade Tip ◽  
Higher Harmonic ◽  
Analysis System

Analytically predicted results of blade-vortex interaction (BVI) airloads, using the second- generation comprehensive helicopter analysis system (2GCHAS), are presented with the experimental results obtained from the higher-harmonic-control aeroacoustic rotor test (HART) program using a 40-percent, Mach-scaled model of the hingeless BO-105 main rotor. Correlations include airloads, blade tip deflections, and tip vortex geometry. The effects on blade airload predictions are studied with higher-harmonic pitch controls (HHC). It was concluded that the blade torsional deflection and the wake system play a very important role in predicting BVI airloads.

A Higher Harmonic Control Test in the DNW to Reduce Impulsive BVI Noise

1994 ◽  
Vol 39 (4) ◽  
pp. 3-13
Author(s):  
Wolf R. Splettstoesser ◽  
Klaus‐J. Schultz ◽  
Roland Kube ◽  
Thomas F. Brooks ◽  
Earl R. Booth ◽  
...  
Keyword(s):  
Control Test ◽  
Harmonic Control ◽  
Higher Harmonic Control ◽  
Higher Harmonic

A Higher Harmonic Control Test in the DNW to Reduce Impulsive BVI Noise

1994 ◽  
Vol 39 (4) ◽  
pp. 3-13 ◽  
Author(s):  
Wolf R. Splettstoesser ◽  
Klaus-J. Schultz ◽  
Roland Kube ◽  
Thomas F. Brooks ◽  
Earl R. Booth ◽  
...  
Keyword(s):  
Control Test ◽  
Harmonic Control ◽  
Higher Harmonic Control ◽  
Higher Harmonic

Effects of higher harmonic control on rotor performance and control loads

1992 ◽  
Vol 29 (3) ◽  
pp. 336-342 ◽  
Author(s):  
Khanh Nguyen ◽  
Inderjit Chopra
Keyword(s):  
Harmonic Control ◽  
Higher Harmonic Control ◽  
Higher Harmonic ◽  
And Control
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