并通过对广义自由度施加一定约束，证明了协调等参元与非协调元之间存在的对应性。
The correlation between compatible and incompatible isoparametric elements was proved by applying some restrictions to the generalized degrees of freedom.
采用八节点的等参单元在空间上进行离散，建立了便于敏度分析的非线性正演和反演的有限元模型，可直接求导进行敏度分析。
The eight-point finite element is used for the discretization in the space system. The finite element model is given, facilitating to sensitivity analysis for non-linear direct and inverse problems.
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