At low flow attenuation performance of semi-active muffler was computed respectively by using theoretical formula and three-dimension finite element method.

低速气流时，分别进行了半主动消声器的消声性能理论计算和三维有限元法数值计算。

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Three-dimension analysis of solid rocket motor grain was presented based on incompressible and nearly incompressible viscoelastic finite element method.

基于不可压和近似不可压粘弹性有限元法，对固体火箭发动机药柱进行了三维分析。

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In this paper, finite element method of a quasi-three dimension problem was described in detail, where the stress-strain relations are linear or nonlinear.

本文详细地描述了准三维问题的有限元法，包括应力应变关系是线性的情况和应力应变关系是非线性的情况。

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