Actuator rate limiting has been linked to the occurrence of pilot-induced oscillations (PIOs). Evidence from many of the events suggests that the airplanes were prone to PIOs before rate limiting was experienced. There is a lack of experimental data to determine if rate limiting causes PIOs, or to what extent it contributes to severity of PIOs. This paper presents the results of a limited flight test investigation of PIO due to elevator rate limiting. Three aircraft dynamics, seven rate limits, and two Head-Up Display (HUD) tracking tasks were evaluated on the US Air Force NT-33A variable stability aircraft by three pilots. The results show that: 1) for airplanes that possess inherent PIO resistance, even the most severe level of rate limiting does not consistently lead to PIO; 2) addition of forward-path filters increases the susceptibility to PIO; and 3) use of augmentation to stabilize a highly unstable design can lead to rapidly divergent PIOs when rate limiting is encountered.


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    Title :

    A flight investigation of pilot-induced oscillation due to rate limiting


    Contributors:
    Mitchell, D.G. (author) / Kish, B.A. (author) / Seo, J.S. (author)


    Publication date :

    1998-01-01


    Size :

    1331888 byte





    Type of media :

    Conference paper


    Type of material :

    Electronic Resource


    Language :

    English



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    Mitchell, D. G. / Kish, B. / Seo, J. et al. | British Library Conference Proceedings | 1998


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    Kish, Brian / Mosle, III, William / Remaly, Adam et al. | AIAA | 1997




    Pilot-Induced Oscillation Analysis and Prediction with Actuator Rate Limiting

    David H. Klyde / Duane T. McRuer / Thomas T. Myers | AIAA | 1997