A 2-d tidal flow mathematical model of Xinghua Bay based on irregular triangular grid finite difference method was set up and numerical simulation of tidal flow field was carried out.
建立了基于不规则三角形网格有限差分法的兴化湾二维潮流数学模型，对兴化湾潮流场进行了数值模拟。
Based on the finite element analysis for 3-d electrostatic field in the fuse-contactor, the mathematical model of inverse problem is set up.
本文以真空组合电器三维静电场有限元分析为基础，建立三维静电场边问题的数学模型。
It is necessary to set up a 3-d finite element model and to convert the external loads acting on the hull into nodal forces of finite element in the direct strength calculation of hull structure.
在船体结构强度直接计算方法中，需要建立三维有限元模型，船体所受到的外载荷也应相应地转化为有限元节点力。
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