DYNAMIC RESPONSE OF MONOPILE-TYPE OFFSHORE WIND TURBINE TO WIND AND WAVE EXCITATION

Abstract

 The Japanese technical standard for the offshore bottom-fixed wind turbines basically follows the international standard established by IEC, considering the natural conditions in the Northern Europe. Therefore, it is necessary to consider the oceanographic conditions such as the high waves and swell associated with the typhoon in the Japanese technical standard, appropriately. However, there are few studies on the effects of the ocean waves on the dynamic response of the offshore bottom-fixed wind turbine. In this study, we investigated the characteristics on the dynamic response of the monopile-type offshore bottom-fixed wind turbine in operation under the winds and waves by using the load coupled analysis. As a result, it is found that the wave loads has a great influence for the bending moment on the sea bottom and it is important to consider the influence of the steepen waves due to the near-breaking waves enough in the design of the offshore bottom-fixed wind turbine.