風力發電機損壞的因素主要有兩項，其一是來自風機廠商對風機基礎樁帽的旋轉勁度或旋轉角度的規範，第二則是要符合“建築物基礎構造設計規範”中對基礎變形與設計支承力的要求。
風力發電機在運轉期間會受到風力或是地震力的作用，因此基礎不斷受到反覆載重的作用，久而久之會造成基礎旋轉勁度衰減進而使得風力發電機基礎旋轉角度提高，風機則會不時地煞起或是停機使得營運成本提高，此時則須評估風機是否能夠繼續延壽運轉或是要終止其運作。本研究在彰化西濱工業區的岸上風力發電機內部架設加速度計、動態位移計、傾度儀與應變計，藉此分析風力發電機塔底基礎受風力等反覆載重之下，基礎的扭轉角、傾角、位移與彎矩，並藉由上述資料回歸分析得到風力發電機的旋轉勁度，藉由量測到的旋轉進度作為評估基礎是否有衰減的指標。
經現場量測結果分析顯示: Y方向旋轉勁度約為46.4 GN-m/radian; Z方向旋轉勁度約為35.9 GN-m/radian;整體合併勁度約為55.3 GN-m/radian，相關係數R值約為0.78，傾角與彎矩相關程度尚好。

The requirement of energy is getting greater due to the rapid development of industries all over the world. Renewable energy must be the solution for oil runout. Taiwan has the excellent wind firms in not only on-shore but off-shore. However, the wind turbine foundation will deteriorate with the passing of time which leads to additional deflection.

This study consists two parts. The first part measure the deflections of on-shore wind turbine foundation by field instrumentation. The sensors consist of accelerometer, displacement meter, tilt meter and strain gauge. The sampling frequency is set to 64 Hz with immediate monitoring. The technique uses baseline correction and band filter to integrate acceleration twice to obtain low frequency displacement (under 0.5 Hz) and regression analysis to gain rotational stiffness.

According to the measuring results, the wind turbine foundation displacement satisfies the local building code. The total rotational stiffness is 55.3GN-m/radian, and correlation coefficient is 0.78.

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