Active Control of Rotor Vibrations by Two Feedforward Control Algorithms

Kari Tammi (Corresponding Author)

    Research output: Contribution to journalArticleScientificpeer-review

    9 Citations (Scopus)

    Abstract

    Resonance vibrations (critical speeds) play a significant role in rotor vibration control. Active vibration control methods for rotors are studied to develop solutions to enhance machines’ dynamic behavior, durability, and operating range. This paper reports rotor vibration attenuation with a supplementary electromagnetic actuator located outside the rotor bearing span. Feedback and feedforward control system design are shown, and comparative experiments on two active vibration control methods for mass unbalance compensation are reported. The methods compared are adaptive FIR filter with the least mean squares (LMS) algorithm and convergent control (CC) method with a frequency-domain adaptation algorithm. The methods were experimentally validated on the rotor test rig (rotor weight 2.7 kg, length 560 mm, and first critical speed about 50 Hz). The feedback system provided wideband damping in the sub- and supercritical regions. The feedforward systems attenuated vibratory responses at the speed of rotation and its harmonic. The attenuation achieved was about 20 dB depending on the rotor speed. Also, discrete-time CC algorithm is shown to have a feedback equivalent circuit. The significance of feedback control lies in making the system phase-characteristics sufficiently smooth for feedforward control methods. Then, feedforward algorithms provided a good vibration damping performance over the operating range. CC was found to be a more effective and simpler algorithm for the purpose than the adaptive FIR filter with the LMS algorithm. The equivalent feedback circuit derived for CC, and systems similar to CC, facilitates their stability and robustness analysis.
    Original languageEnglish
    Number of pages10
    JournalJournal of Dynamic Systems, Measurement and Control
    Volume131
    Issue number5
    DOIs
    Publication statusPublished - 2009
    MoE publication typeA1 Journal article-refereed

    Fingerprint

    feedforward control
    Feedforward control
    active control
    Vibrations (mechanical)
    rotors
    Rotors
    vibration
    Vibration control
    feedback circuits
    FIR filters
    Adaptive filters
    critical velocity
    Feedback
    Feedback control
    feedback control
    equivalent circuits
    Bearings (structural)
    Damping
    attenuation
    rotor speed

    Keywords

    • adaptive control
    • compensation
    • control system synthesis
    • damping
    • durability
    • electromagnetic actuators
    • feedforward
    • FIR filters
    • frequency-domain analysis
    • machine bearings
    • resonance
    • rotors
    • vibration control

    Cite this

    @article{f74753f5e64b48389bffb6c05710c7ec,
    title = "Active Control of Rotor Vibrations by Two Feedforward Control Algorithms",
    abstract = "Resonance vibrations (critical speeds) play a significant role in rotor vibration control. Active vibration control methods for rotors are studied to develop solutions to enhance machines’ dynamic behavior, durability, and operating range. This paper reports rotor vibration attenuation with a supplementary electromagnetic actuator located outside the rotor bearing span. Feedback and feedforward control system design are shown, and comparative experiments on two active vibration control methods for mass unbalance compensation are reported. The methods compared are adaptive FIR filter with the least mean squares (LMS) algorithm and convergent control (CC) method with a frequency-domain adaptation algorithm. The methods were experimentally validated on the rotor test rig (rotor weight 2.7 kg, length 560 mm, and first critical speed about 50 Hz). The feedback system provided wideband damping in the sub- and supercritical regions. The feedforward systems attenuated vibratory responses at the speed of rotation and its harmonic. The attenuation achieved was about 20 dB depending on the rotor speed. Also, discrete-time CC algorithm is shown to have a feedback equivalent circuit. The significance of feedback control lies in making the system phase-characteristics sufficiently smooth for feedforward control methods. Then, feedforward algorithms provided a good vibration damping performance over the operating range. CC was found to be a more effective and simpler algorithm for the purpose than the adaptive FIR filter with the LMS algorithm. The equivalent feedback circuit derived for CC, and systems similar to CC, facilitates their stability and robustness analysis.",
    keywords = "adaptive control, compensation, control system synthesis, damping, durability, electromagnetic actuators, feedforward, FIR filters, frequency-domain analysis, machine bearings, resonance, rotors, vibration control",
    author = "Kari Tammi",
    note = "Project code: 26153",
    year = "2009",
    doi = "10.1115/1.3155015",
    language = "English",
    volume = "131",
    journal = "Journal of Dynamic Systems, Measurement and Control",
    issn = "0022-0434",
    publisher = "American Society of Mechanical Engineers ASME",
    number = "5",

    }

    Active Control of Rotor Vibrations by Two Feedforward Control Algorithms. / Tammi, Kari (Corresponding Author).

    In: Journal of Dynamic Systems, Measurement and Control, Vol. 131, No. 5, 2009.

    Research output: Contribution to journalArticleScientificpeer-review

    TY - JOUR

    T1 - Active Control of Rotor Vibrations by Two Feedforward Control Algorithms

    AU - Tammi, Kari

    N1 - Project code: 26153

    PY - 2009

    Y1 - 2009

    N2 - Resonance vibrations (critical speeds) play a significant role in rotor vibration control. Active vibration control methods for rotors are studied to develop solutions to enhance machines’ dynamic behavior, durability, and operating range. This paper reports rotor vibration attenuation with a supplementary electromagnetic actuator located outside the rotor bearing span. Feedback and feedforward control system design are shown, and comparative experiments on two active vibration control methods for mass unbalance compensation are reported. The methods compared are adaptive FIR filter with the least mean squares (LMS) algorithm and convergent control (CC) method with a frequency-domain adaptation algorithm. The methods were experimentally validated on the rotor test rig (rotor weight 2.7 kg, length 560 mm, and first critical speed about 50 Hz). The feedback system provided wideband damping in the sub- and supercritical regions. The feedforward systems attenuated vibratory responses at the speed of rotation and its harmonic. The attenuation achieved was about 20 dB depending on the rotor speed. Also, discrete-time CC algorithm is shown to have a feedback equivalent circuit. The significance of feedback control lies in making the system phase-characteristics sufficiently smooth for feedforward control methods. Then, feedforward algorithms provided a good vibration damping performance over the operating range. CC was found to be a more effective and simpler algorithm for the purpose than the adaptive FIR filter with the LMS algorithm. The equivalent feedback circuit derived for CC, and systems similar to CC, facilitates their stability and robustness analysis.

    AB - Resonance vibrations (critical speeds) play a significant role in rotor vibration control. Active vibration control methods for rotors are studied to develop solutions to enhance machines’ dynamic behavior, durability, and operating range. This paper reports rotor vibration attenuation with a supplementary electromagnetic actuator located outside the rotor bearing span. Feedback and feedforward control system design are shown, and comparative experiments on two active vibration control methods for mass unbalance compensation are reported. The methods compared are adaptive FIR filter with the least mean squares (LMS) algorithm and convergent control (CC) method with a frequency-domain adaptation algorithm. The methods were experimentally validated on the rotor test rig (rotor weight 2.7 kg, length 560 mm, and first critical speed about 50 Hz). The feedback system provided wideband damping in the sub- and supercritical regions. The feedforward systems attenuated vibratory responses at the speed of rotation and its harmonic. The attenuation achieved was about 20 dB depending on the rotor speed. Also, discrete-time CC algorithm is shown to have a feedback equivalent circuit. The significance of feedback control lies in making the system phase-characteristics sufficiently smooth for feedforward control methods. Then, feedforward algorithms provided a good vibration damping performance over the operating range. CC was found to be a more effective and simpler algorithm for the purpose than the adaptive FIR filter with the LMS algorithm. The equivalent feedback circuit derived for CC, and systems similar to CC, facilitates their stability and robustness analysis.

    KW - adaptive control

    KW - compensation

    KW - control system synthesis

    KW - damping

    KW - durability

    KW - electromagnetic actuators

    KW - feedforward

    KW - FIR filters

    KW - frequency-domain analysis

    KW - machine bearings

    KW - resonance

    KW - rotors

    KW - vibration control

    U2 - 10.1115/1.3155015

    DO - 10.1115/1.3155015

    M3 - Article

    VL - 131

    JO - Journal of Dynamic Systems, Measurement and Control

    JF - Journal of Dynamic Systems, Measurement and Control

    SN - 0022-0434

    IS - 5

    ER -