A research investigation has been conducted on the effects of pitch-due-to-roll and roll-due-to pitch cross coupling on helicopter handling qualities while performing a forward flight (60 knots) roll axis tracking task. Conducted under the US/German Memorandum of Understanding (MOU) for Cooperative Research in Helicopter Aeromechanics, this study involved complementary use of a NASA-Ames ground-based simulation and two in-flight simulations using DLR's (Deutsche Luft- und Raumfahrt-Behörde) variable-stability BO 105. The results show that for a roll tracking task, the current time-domain pitch-roll cross coupling criteria does discriminate against unacceptable coupling from basic control, rate, and combined control-rate coupling. However, this citeria format does not discriminate against washed-out coupling which can occur in helicopters with feedback control systems. In addition, the data suggest a tightening in the ADS-33 Level 1-2 boundary, and the four-second window specified for obtaining compliance data may not be suited for highly agile helicopters. A newly proposed frequency-domain criteria offers more comprehensive coverage that shows consistency for all types of coupling investigated. An additional benefit is that the required frequency-domain data can be obtained from the bandwidth tests and analysis, thus reducing compliance flight time by eliminating specific pitch-roll coupling tests.
Rotorcraft pitch-roll decoupling requirements from a roll tracking maneuver
Journal of the American Helicopter Society ; 42 , 3 ; 282-296
1997
15 Seiten, 25 Bilder, 2 Tabellen, 26 Quellen
Article (Journal)
English
Hubschrauber , Steuerung , Rollbewegung , Bahnverfolgung , Forschungsprojekt , Aeromechanik , Aerodynamik , Flugsimulation , Simulator , Stabilität , Steuerungs- und Regelungssystem , Rückkopplung , Frequenzbereich , Kopplung , Bandbreite (Frequenz) , Vergleichsmessung , Rechenmodell , Militärflugzeug , Simulationsmodell , Differenzialgleichung , Leistungsbewertung , Entkopplung
Rotorcraft pitch-roll decoupling requirements from a roll tracking maneuver
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