通过得到的固有振动频率值，并与电磁力激发的强迫振动频率值进行比较，对不同情况下鼻端引水线在运行时的安全性进行一定的分析。
The natural frequencies and frequencies of electromagnetic force of diversion water pipe are compared, the security of diversion water pipe in different running condition is analyzed.
用多台起振机进行稳态强迫振动试验，测定了该坝前十阶自振频率、阻尼和振型。
The first ten natural frequencies, damping ratios and mode shapes of the dam were measured through steady forced vibration test using multiple vibrators.
计算结果表明，疲劳裂纹不仅使悬臂梁的固有频率下降，而且引起非线性强迫振动响应。
The results show that the fatigue crack not only decreases the natural frequency, but also causes non linear vibration.
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