Modal test was done on a cable-stayed structure in its healthy and two damaged conditions. Curvature of the Frequency Response Function (FRF) was used to detect the location of damage.
对一拉索结构的正常状态及两种损伤状态进行了模态测试,用频响函数的曲率来进行损伤检测。
For example, areas with mangrove forests were not damaged as badly by the Indian Ocean tsunami in two thousand four.
VOA: special.2010.04.20
Eleven workers died. He said BP expects to complete two relief wells in August to stop the leak from a damaged well.
VOA: special.2010.06.19
Workers are drilling two relief wells in an effort to ease pressure on the damaged well.
VOA: special.2010.06.04
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