通过建立热力学状态空间，给出了简单明潦的自由能判据的向量表达式。
A concise vectoexpression formula can be given out by establishing state space.
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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