阐述了复模态理论，分析了系统自由振动在复特征向量空间内的特性。

The complex mode theory is presented, with analysis of the characteristics of the free vibrations of these systems in the complex eigenvector space.

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采用复模态分析求取特征值和特征向量，进而得到系统的模态参数。

Complex modal analysis is then performed to calculate the eigenvalues and eigenvectors, and then modal parameters are obtained.

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采用复模态分析求取特征值和特征向量，进而得到系统的模态参数。

Complex modal analysis is then performed to calculate the eigenvalues and eigenvectors, and then modal parameters are obtained.

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