CFD-Based Control for Flutter Suppression, Gust Load Alleviation, and Ride Quality Enhancement for the S4T Model

2010 ◽  
Author(s):  
Boris Moulin ◽  
Erich Ritz ◽  
P. C. Chen ◽  
D. Lee
Keyword(s):  
Ride Quality ◽  
Quality Enhancement ◽  
Flutter Suppression ◽  
Gust Load Alleviation

Active aeroelastic wing design for gust load alleviation and flutter suppression

1997 ◽  
Author(s):  
Changho Nam ◽  
Youdan Kim ◽  
Jeffrey Layton ◽  
Changho Nam ◽  
Youdan Kim ◽  
...  
Keyword(s):  
Wing Design ◽  
Flutter Suppression ◽  
Gust Load Alleviation

Design of a multivariable flutter suppression/gust load alleviation system

1988 ◽  
Vol 11 (3) ◽  
pp. 220-229 ◽  
Author(s):  
B. S. Liebst ◽  
W. L. Garrard ◽  
Jerome A. Farm
Keyword(s):  
Flutter Suppression ◽  
Gust Load Alleviation

Higher Harmonic Control: A Historical Perspective

2021 ◽  
Author(s):  
Charles E. Hammond
Keyword(s):  
Wind Tunnel ◽  
Ride Quality ◽  
Flight Tests ◽  
Flutter Suppression ◽  
Harmonic Control ◽  
Wing Flutter ◽  
Higher Harmonic Control ◽  
Higher Harmonic ◽  
Langley Research Center ◽  
Helicopter Vibration

Higher harmonic control (HHC) is an approach for achieving reduced helicopter vibration by controlling the vibratory rotor airloads in such a way that the fuselage excitation is minimized. This paper is a historical look at how a program aimed at helicopter vibration reduction started as an outgrowth of fixed wing flutter suppression at NASA Langley Research Center, proved the HHC concept on aeroelastically scaled wind tunnel models and went on to demonstrate viability in full-scale flight testing on the OH-6A helicopter in 1982. Following the OH-6A flight tests, the helicopter research community was stimulated to prove the effectiveness of HHC on different configurations through analysis, wind tunnel tests, and flight tests. All of these investigations have shown HHC to be effective in reducing vibration to levels not attainable with conventional vibration control methods and without any detrimental side effects. HHC development has progressed to the point that the technology provides one more option to address the ever-present vibration problem in helicopters. The literature demonstrates that helicopter ride quality equivalent to that of fixed wing aircraft is attainable with application of HHC.

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