The common calculation methods include dual pressure method and pressure temperature method in which the air bag FEM model can be created using the direct folding method or initial matrix method.
常用的计算方法有双压法和压力温度法等，可以采用直接折叠法或初始矩阵法建立气囊的有限元模型。
Moreover, symplectic analysis for electromagnetic waveguides provides the theoretical basis for constructing dual finite element method (FEM).
同时，电磁波导的辛分析也是构造对偶有限元的理论基础。
The dual variable FEM formulation can avoid the difficulty of C1 continuity condition.
对偶变量有限元推导可避免所谓的C1连续性问题。
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