風力機塔架的設計壽命通常為二十年，台灣地區第一期風力機即將在2020屆滿使用期限。由於過去風力機的設計採用較高的安全係數以及歷年來的平均風速逐漸降低，以至於風力機可能會超過原先的設計壽命。本研究建立了風力機塔架負載量測方法與疲勞壽命分析方法，可做為後續進行塔架延壽評估之基礎。研究對象為台中港區2 MW水平軸風力機(9號機)。在塔架底部黏貼應變規，依據IEC 61400-13規範進行風速及負載量測，並以FAMOS軟體撰寫數據處理程式，求得風速分布及等效負載。在疲勞壽命評估方面，藉由短時間應變量測的馬可夫矩陣及配合風速分布，外推風力機在正常發電狀況下的20年負載歷程及計算疲勞損傷。研究結果顯示，風力機在20年的正常發電狀況下，塔架底部(不考慮螺栓)不會產生疲勞失效。

The tower of wind turbines is commonly designed for 20-year service life. The first phase of wind turbines in Taiwan will be expired in 2020. Due to reserves resulting from design safety factors and lower average wind speeds than expected, wind turbines are likely to operate beyond their designed life. This study established load measurement method and fatigue life prediction of a 2 MW wind turbine located in Taichung port. The load measurement was done according to the IEC 61400-13 standard, and several strain gages were mounted in the bottom of the wind turbine tower. Wind speed and load data were processed with FAMOS software to obtain wind speed distribution and equivalent load. In respect to fatigue analysis, based on the wind speed distribution, the stress data was extrapolated to gain the endured load spectrum in 20 years. Finally, fatigue damage of the tower was evaluated. From the results, fatigue life of the wind turbine tower under normal operation is far beyond 20 years.

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