The constant complex module of viscoelastic material is used to calculate the frequency and loss factor of the sandwich pate by the complex eigenvalue method.
粘弹性采用常复数模型，用求解复特征值的方法求得了其固有频率和损耗因子。
The presented method selects only one cyclic symmetric sector of the structure as the finite element calculating model and establishes the complex constrained eigenvalue equation of the sector.
选取结构的任一个循环对称扇区作为有限元计算模型，建立单个扇区复约束特征值方程；
The presented method selects only one cyclic symmetric sector of the structure as the finite element calculating model and establishes the complex constrained eigenvalue equation of the sector.
选取结构的任一个循环对称扇区作为有限元计算模型，建立单个扇区复约束特征值方程；
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