An damage indicator was defined to determine the location of structural damage elements, and the proper testing modal modes used in the inverse computation could be selected accordingly.

基于模态力余量，定义了一种损伤指标来预先判定结构损伤单元的位置，并可据此选取合适的测试模态阶数进行反演计算。

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In addition to the fatigue testing, the lab does modal analysis, to evaluate what will happen to the blades as a result of unpredictable wind gusts.

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