This paper presents development and testing of a robust, individual, real-time, closed-loop blade control methodology for rotor vibration suppression using piezoactuated trailing-edge flaps and active twist tip rotors. The controller uses a neural network to learn to actuate the trailing-edge flap, thus adaptively suppressing the blade or hub vibrations. Two different of Mach-scaled smart rotor models, the first one with piezoactuated trailing flaps and the second one with piezo plus bending-torsion coupling actuated blade tips, controlled by the same adaptive neurocontrol algorithm, were tested successfully in hover and demonstrated their effectiveness in open-loop. The first tests conducted with the first model were to demonstrate the neurocontroller learning to counter the background vibrations arising from the nontracked rotor. In these tests the neurocontroller was shown to reduce the total vibrational energy by 73%. Moreover, the controller has achieved a broadband reduction in vibration, exhibited by significant reductions up to 5 rev-1. The second tests were to demonstrate the neurocontroller inducing vibratory loads at specific frequencies as would be necessary for vibration reduction of the rotor in forward flight situations. The neurocontroller canceled the 1 rev-1 and 3 rev-1 background vibration while simultaneously inducing the desired 2 rev-1 load. The final tests carried out with the second rotor model was to demonstrate that the new controller could actually operate independently of the specific actuator. In the background suppression test the controller was shown to reduce the vibration by 98 %, and a multifrequency load test demonstrated that the controller learns a broad spectrum input to achieve the control task.


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    Title :

    Closed-loop neurocontroller tests on piezoactuated smart rotor blades in hover


    Additional title:

    Erprobung eines Neuroreglers zur aktiven Schwingungsdämpfung mit piezoelektrisch betätigten Stellklappen an den Rotorblättern von Hubschraubern


    Contributors:
    Spencer, M.G. (author) / Sanner, R.M. (author) / Chopra, I. (author)

    Published in:

    AIAA Journal ; 40 , 8 ; 1596-1602


    Publication date :

    2002


    Size :

    7 Seiten, 15 Bilder, 32 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




    Closed-Loop Neurocontroller Tests on Piezoactuated Smart Rotor Blades in Hover

    Michael G. Spencer / Robert M. Sanner / Inderjit Chopra | AIAA | 2002



    Closed-loop hover test results with a neurocontroller on piezo-actuated smart rotor blades

    Spencer, M.G. / Sanner, R.M. / Chopra, I. | Tema Archive | 2000


    Open-loop hover testing of a smart rotor model

    Koratkar, N.A. / Chopra, I. | Tema Archive | 2002


    Open-Loop Hover Testing of a Smart Rotor Model

    Nikhil A. Koratkar / Inderjit Chopra | AIAA | 2002