A New Identification Method for Bolt Looseness in Wind Turbine Towers

<div>Vibration FFT spectra of two wind turbine towers (1 and 3). The spike in each subplot corresponds to the first-order natural frequency of each tower. (a) Vibration FFT spectra of No. 1 wind turbine tower. (b) Vibration FFT spectra of No. 3 wind turbine tower.</div>

Shock and Vibration

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Figure 3

Figure 3: A New Identification Method for Bolt Looseness in Wind Turbine Towers 