Active Control of Radial Rotor Vibrations. Identification, feedback, feedforward, and repetitive control methods: Dissertation

Kari Tammi

    Research output: ThesisLicenciateTheses

    Abstract

    Active vibration control methods for rotors were studied in order to develop solutions to enhance machines' dynamic behaviour, durability, and operating range. The aim of the thesis was to develop identification and control methods for active vibration control of a rotor. The identification method developed in the thesis improved run-time rotor identification by compensating rotation-related disturbances before the actual identification procedure. The control system design comprised an inner feedback loop and an outer loop for compensation for harmonic excitations due to mass unbalance and other rotation-related excitations. The feedback loop was shown to be essential in terms of providing favourable conditions for the other compensation algorithm in the outer loop. For the outer loop, three algorithms were tested: two feedforward control methods and a repetitive control method. The algorithms were validated and compared using an experimental set-up. Concerning the feedforward methods, the Convergent Control algorithm was found to be a more effective and simpler algorithm for the purpose than the adaptive FIR filter with the LMS algorithm. The adaptive gradient-based repetitive control, developed in this thesis, was found to have a poorer performance than the feedforward control methods, but to provide benefits for applications where excitation frequencies are not as predictable as in the current application.
    Original languageEnglish
    QualificationDoctor Degree
    Awarding Institution
    • Aalto University
    Supervisors/Advisors
    • Koivo, Heikki, Supervisor, External person
    • Zenger, Kai, Supervisor, External person
    Award date4 May 2007
    Place of PublicationEspoo
    Publisher
    Print ISBNs978-951-38-7007-2
    Electronic ISBNs978-951-38-7008-9
    Publication statusPublished - 2007
    MoE publication typeG3 Licentiate thesis

    Fingerprint

    Rotors
    Feedback
    Feedforward control
    Vibration control
    FIR filters
    Adaptive filters
    Identification (control systems)
    Durability
    Systems analysis
    Control systems
    Compensation and Redress

    Keywords

    • dynamic rotor systems
    • radial vibrations
    • rotors
    • control methods
    • active control
    • vibrations
    • identification
    • feedback control
    • feedforward control
    • repetitive control

    Cite this

    @phdthesis{56c4a66c2a424fa69e3dcefc9e10902c,
    title = "Active Control of Radial Rotor Vibrations. Identification, feedback, feedforward, and repetitive control methods: Dissertation",
    abstract = "Active vibration control methods for rotors were studied in order to develop solutions to enhance machines' dynamic behaviour, durability, and operating range. The aim of the thesis was to develop identification and control methods for active vibration control of a rotor. The identification method developed in the thesis improved run-time rotor identification by compensating rotation-related disturbances before the actual identification procedure. The control system design comprised an inner feedback loop and an outer loop for compensation for harmonic excitations due to mass unbalance and other rotation-related excitations. The feedback loop was shown to be essential in terms of providing favourable conditions for the other compensation algorithm in the outer loop. For the outer loop, three algorithms were tested: two feedforward control methods and a repetitive control method. The algorithms were validated and compared using an experimental set-up. Concerning the feedforward methods, the Convergent Control algorithm was found to be a more effective and simpler algorithm for the purpose than the adaptive FIR filter with the LMS algorithm. The adaptive gradient-based repetitive control, developed in this thesis, was found to have a poorer performance than the feedforward control methods, but to provide benefits for applications where excitation frequencies are not as predictable as in the current application.",
    keywords = "dynamic rotor systems, radial vibrations, rotors, control methods, active control, vibrations, identification, feedback control, feedforward control, repetitive control",
    author = "Kari Tammi",
    note = "Project code: 5143",
    year = "2007",
    language = "English",
    isbn = "978-951-38-7007-2",
    series = "VTT Publications",
    publisher = "VTT Technical Research Centre of Finland",
    number = "634",
    address = "Finland",
    school = "Aalto University",

    }

    Active Control of Radial Rotor Vibrations. Identification, feedback, feedforward, and repetitive control methods : Dissertation. / Tammi, Kari.

    Espoo : VTT Technical Research Centre of Finland, 2007. 165 p.

    Research output: ThesisLicenciateTheses

    TY - THES

    T1 - Active Control of Radial Rotor Vibrations. Identification, feedback, feedforward, and repetitive control methods

    T2 - Dissertation

    AU - Tammi, Kari

    N1 - Project code: 5143

    PY - 2007

    Y1 - 2007

    N2 - Active vibration control methods for rotors were studied in order to develop solutions to enhance machines' dynamic behaviour, durability, and operating range. The aim of the thesis was to develop identification and control methods for active vibration control of a rotor. The identification method developed in the thesis improved run-time rotor identification by compensating rotation-related disturbances before the actual identification procedure. The control system design comprised an inner feedback loop and an outer loop for compensation for harmonic excitations due to mass unbalance and other rotation-related excitations. The feedback loop was shown to be essential in terms of providing favourable conditions for the other compensation algorithm in the outer loop. For the outer loop, three algorithms were tested: two feedforward control methods and a repetitive control method. The algorithms were validated and compared using an experimental set-up. Concerning the feedforward methods, the Convergent Control algorithm was found to be a more effective and simpler algorithm for the purpose than the adaptive FIR filter with the LMS algorithm. The adaptive gradient-based repetitive control, developed in this thesis, was found to have a poorer performance than the feedforward control methods, but to provide benefits for applications where excitation frequencies are not as predictable as in the current application.

    AB - Active vibration control methods for rotors were studied in order to develop solutions to enhance machines' dynamic behaviour, durability, and operating range. The aim of the thesis was to develop identification and control methods for active vibration control of a rotor. The identification method developed in the thesis improved run-time rotor identification by compensating rotation-related disturbances before the actual identification procedure. The control system design comprised an inner feedback loop and an outer loop for compensation for harmonic excitations due to mass unbalance and other rotation-related excitations. The feedback loop was shown to be essential in terms of providing favourable conditions for the other compensation algorithm in the outer loop. For the outer loop, three algorithms were tested: two feedforward control methods and a repetitive control method. The algorithms were validated and compared using an experimental set-up. Concerning the feedforward methods, the Convergent Control algorithm was found to be a more effective and simpler algorithm for the purpose than the adaptive FIR filter with the LMS algorithm. The adaptive gradient-based repetitive control, developed in this thesis, was found to have a poorer performance than the feedforward control methods, but to provide benefits for applications where excitation frequencies are not as predictable as in the current application.

    KW - dynamic rotor systems

    KW - radial vibrations

    KW - rotors

    KW - control methods

    KW - active control

    KW - vibrations

    KW - identification

    KW - feedback control

    KW - feedforward control

    KW - repetitive control

    M3 - Licenciate

    SN - 978-951-38-7007-2

    T3 - VTT Publications

    PB - VTT Technical Research Centre of Finland

    CY - Espoo

    ER -