The natural frequency, damping ratio and mode shape of a multi-degree-of-freedom system are analyzed and the identified results are in good agreement with the theoretical values.

并针对一多自由度系统具体论述了固有频率、阻尼比和振型的识别方法，识别结果与理论结果吻合较好。

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Natural vibration characteristic of gun tube was analyzed triumphantly. Vibration frequency and mode shape were obtained.

对某火炮身管固有振动特性进行了分析，计算得到了振动频率和振型。

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Therefore, through structural modal analysis with different damage degree using ANSYS, get natural frequencies and mode shape data as neural network input vector after unitary.

因此，通过有限元软件ANSYS对具有各种损伤程度的结构进行模态分析，得到固有频率和模态分量的数据，经过归一化处理后作为神经网络的输入向量。

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