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。
On-site vibration test of the servicing rig substructure is made, and the frequency response function curve and preceding 10 modes frequency are obtained.
对现役钻机底座做了现场振动测试，得到频响函数曲线及前10阶模态频率。
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