The active control of flexible rotors is a challenging control problem because of the plant variation with rotational speed, the open-loop instability of the plant at super-flexible rotational speeds, and the presence of synchronous disturbances. This paper examines one of these problems, the open-loop nonsynchronous instability that is caused by internal damping in the rotating structure. This instability occurs only when the rotor is operated at high rotational speeds, rotational speeds greater than the first flexible-mode frequency of the free standing rotor. The emphasis in the paper is the development of constraints placed on controllers designed to stabilize the open-loop unstable, high-speed operation of flexible rotors. These constraints are developed by analyzing a specific two-mass flexible rotor system. This multi-input, multi-output system can be described by 'complex coefficient' single-input, single-output models by the use of complex coefficient differential equations. Using control analysis and design methods recently developed for these complex coefficient transfer functions, the constraints placed on stabilizing controllers are developed. Stabilizing controllers are shown to have minimum and maximum gain and bandwidth constraints.


    Access

    Access via TIB

    Check availability in my library


    Export, share and cite



    Title :

    Stability constraints on the control of flexible rotors


    Additional title:

    Stabilitaetsanforderungen an das Regelsystem von Satelliten-Schwungrad-Energiespeichern mit Magnetlagern


    Contributors:


    Publication date :

    1987


    Size :

    6 Seiten, 12 Bilder, 9 Quellen


    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    Stability Constraints on the Control of Flexible Rotors

    Johnson, Bruce G. / Hockney, Richard L. / Eisenhaure, David B. et al. | AIAA | 1987



    Stochastic modeling of flexible rotors

    Koroishi, Edson H. / Cavalini, Aldemir Ap. jun. / Steffen, Valder jun. | Tema Archive | 2012


    Design of helicopter rotors to noise constraints

    Schaeffer, E. G. / Sternfeld, H., Jr. | NTRS | 1978


    Active Vibration Control of Flexible Rotors on Maneuvering Vehicles

    Das, A. S. / Dutt, J. K. / Ray, K. | AIAA | 2010