Historically, component-type flight mechanics simulation models of helicopters have been unable to satisfactorily predict the roll response to pitch stick input and the pitch response to roll stick input off-axes responses. In the study presented here, simple first-order low-pass filtering of the elemental lift and drag forces was considered as a means of improving the correlation. The method was applied to a blade-element model of the AH-64 APache, and responses of the modified model were compared with flight data in hover and forward flight. Results indicate that significant improvement in the off-axes responses can be achieved in hover. In forward flight, however, the best correlation in the longitudinal and lateral off-axes responses required different values of the filter time constant for each axis. A compromise value was selected and was shown to result in good overall improvement in the off-axes responses. The paper describes both the method and the model used for its implementation, and presents results obtained at hover and in forward flight.


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    Title :

    Empirical Correction Method for Improving off-Axes Response Prediction in Component Type Flight Mechanics Helicopter Models


    Contributors:

    Publication date :

    1997


    Size :

    16 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English





    An Empirical Correction Method for Improving Off-Axes Response Prediction in Component Type Flight Mechanics Helicopter Models

    Mansur, M. H. / Tischler, M. B. / Advisory Group for Aerospace Research and Development; Flight Vehicle Integration Panel | British Library Conference Proceedings | 1997