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1·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。

2·This paper analyses the sound decay in an acoustically treated rectangular space from the view point of wave acoustics. and a new method of calculating complex eigenvalue is given.

本文从波动声学观点出发，分析了矩形水池中声能的衰变，给出了一种解算复本征值的新方法。

3·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；