本文从无阻尼系统开始，讨论了物理参数的变化引起结构动特性变化的灵敏度。

Beginning with the no damping system in this paper, the change rates of the structure's dynamic properties, caused by the small change of system parameters are discussed.

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本文从无阻尼系统出发，理论上分析了转子系统振动方程的特征根，特征向量所具有的特点。

In this paper, the properties of eigenvalues and eigenvectors of rotor systems are discussed. The derivation shows that eigenvalues are imaginary in non-damping systems, and eigenspaces are complete.

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BERMAN修正方法基于无阻尼系统的模态正交条件，利用实验模态矩阵和特征值对有限元理论模型进行修正。

BERMAN updating arithmetic makes use of experimental model matrix and eigenvalue to modify the finite element academic model, based on the model orthographical condition of non-damping system.

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