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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/108937


    Title: Theoretical Analysis of Wind Turbine Tower-Nacelle Axial Vibration Based on the Mechanical Impedance Method
    Authors: Dong Xiaohui
    Keywords: Wind Turbine;Axial Vibration;Mechanical Impedance Method;Amplitude-frequency Characteristic
    Date: 2016-03
    Issue Date: 2016-12-20 09:38:01 (UTC+8)
    Publisher: 淡江大學出版中心
    Abstract: Based on an established axial vibration model of the wind turbine tower-nacelle system, the
    mechanical impedance method was applied to construct the mechanical network diagram for the axial
    vibration of the tower-nacelle system. Then, the axial free vibration and forced vibration of the system
    were analyzed theoretically with considering the displacement impedance or admittance as the transfer
    function. The analysis shows: for free vibration, the system performs damped vibration with light
    damping, the amplitude attenuates exponentially with light damping, the system returns to the
    equilibrium position directly with over-damping, and the system does not generate reciprocating
    vibration with critical damping; for forced vibration, the amplitude of the axial displacement response
    is related to the frequency ratio of rotation rate. The resonance frequency does not occur at the
    undamped natural frequency 0. The peak value of the vibration triggered by blade mass imbalance
    shifts toward the high frequency direction along with the increase of damping ratio , while the peak
    value of the vibration triggered by tower front spoiler and pneumatic imbalance shifts toward the low
    frequency direction along with the increase of . If >
    2
    2 , the amplitude frequency has no peak value,
    and resonance does not occur. The analysis provides a theoretical basis for the design and control of the
    wind turbine tower.
    Relation: Journal of Applied Science and Engineering 19(1), pp.53-64
    DOI: 10.6180/jase.2016.19.1.07
    Appears in Collections:[Journal of Applied Science and Engineering] v.19 n.1

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