和值不同的是，变量没有固有类型。

Unlike values, variables have no inherent type.

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以位移模型为基础，用有限元中的分离变量法的理论，求解了圆柱壳自由振动的固有频率，计算结果与壳体解析解相一致。

This paper calculate inherent frequency of the free vibration of the cylinder shell with the theory of the separated variable method on the basis of displacement model.

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导出了用变形、内力作为混合状态变量表示的求解等截面梁的横向振动固有频率的普遍方程。

The deformations and the internal forces at a cross section of a beam are taken as state variables to formulate a general equation for computing the natural frequencies of non-uniform beams.

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