A New Identification Method for Bolt Looseness in Wind Turbine Towers

<div>Vibration modes and phase differences of the No. 1 wind turbine tower. (a) The first-order vibration mode under six working conditions. (b) The first-order phase difference under six working conditions.</div>

Shock and Vibration

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Figure 4

Figure 4: A New Identification Method for Bolt Looseness in Wind Turbine Towers 