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.


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    Title :

    Rotorcraft pitch-roll decoupling requirements from a roll tracking maneuver


    Contributors:

    Published in:

    Publication date :

    1997


    Size :

    15 Seiten, 25 Bilder, 2 Tabellen, 26 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English





    Rotorcraft Pitch-Roll Decoupling Requirements from a Roll Tracking Maneuver

    Blanken, C. L. / Ockier, C. J. / Simmons, R. C. et al. | British Library Conference Proceedings | 1994


    Rotorcraft Pitch-Roll Cross Coupling Evaluation for Aggressive Tracking Manoeuvering

    Pausder, H. J. / Blanken, C. L. / Associazione Italiana di Aeronautica ed Astronautica et al. | British Library Conference Proceedings | 1993


    Roll Maneuver Evaluation

    W. W. Webb | NTIS | 1975


    Roll maneuver evaluation

    Webb, W. W. | NTRS | 1975