The tower resonance frequency is a critical factor influencing the fatigue life of an offshore wind turbine structure. Every structure has a natural frequency at which it tends to vibrate when subjected to an external force. This natural frequency is called the resonance frequency. If the frequency of the external force matches or is close to the tower's resonance frequency, the tower will experience amplified vibrations, similar to how a swing gains height with each push at the right moment. For offshore wind turbines, the primary sources of excitation are wind loads and wave loads. The frequency of these loads varies depending on wind speed, wave height, and other environmental factors. If the tower's resonance frequency is close to the frequency of the....
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