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以悬臂梁作实验模型，测量其自由端加速度对该点激振荷载的幅频特性曲线，求得 具有不同深度切口悬臂梁的前两阶固有频率和幅频特性曲线的前两个峰值对切口的灵敏 度。结果表明，与基频相比幅频特性曲线的第一峰值对悬臂梁切口的灵敏度大约高出一 个数量级，第二固有频率也比基频对切口的灵敏度要高一些。还用模态综合法算出切口 悬臂梁的前两阶固有频率和幅频特性曲线的前两个峰．结果与实验能较好地吻合．
Using the cantilever beam as an experimental model, the amplitude-frequency characteristic curve of the acceleration at the free end of the point is measured to obtain the first two peak frequencies and the first two peak-value characteristics of the amplitude-frequency characteristic curve of the notched cantilever with different depths. The sensitivity. The results show that the first peak of the amplitude-frequency characteristic curve is approximately an order of magnitude more sensitive to the cantilever incision than the fundamental frequency, and the second natural frequency is also slightly more sensitive than the fundamental frequency to the incision. The first two natural frequencies of the notched cantilever beam and the first two peaks of the amplitude-frequency characteristic curve are also calculated using the modal synthesis method. The results are in good agreement with the experiment.