相比于正实性，有限频率正实性则是较近提出的概念，并且亦在控制理论中找到了大量应用。

Compared with positive realness, finite frequency positive realness is a new notion, and it also finds some important applications in control theory.

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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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根据波动理论，满足随机响应工程计算精度要求的有限元网格大小与待求高频随机响应问题的频率范围上限有关。

According to wave motion theory, finite element mesh size satisfying the needs of engineering calculating precision is relevant to the upper limit of frequency range of random (response) problems.

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