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Global warming and the depletion of fossil fuels have been caused by decades of reckless development.Wind energy is one form of renewable energy and is considered a future energy source. The wind tower is designedwith a fundamental frequency in the soft-stiff design between the 1P and 3P range to avoid resonance. Usually, toperform natural frequency analysis of a wind tower, the boundary condition is set to the Fixed-End, and soil-pile interaction is not considered. In this study, consideration of the effect of soil-pile interaction on the wind tower wasincluded and the difference in the natural frequency was studied. The fixed boundary condition was not affected bythe soil condition and depth of the pile and the coupled spring boundary condition was unaffected by the depth of pile but affected by the depth of the pile, and the Winkler spring boundary condition is affected by both the soilcondition and the depth of the pile. Therefore, the coupled spring boundary condition should be used in shallow depth soil conditions because the soil condition does not take the shallow depth soil into consideration.

Study on the Natural Frequency of Wind Turbine Tower Based on Soil Pile interaction to Evaluate Resonant Avoidance Frequency