IV and front sandbar, the reservoirs have the characters of multiplayer. low permeability, small single layer thickness.

油层具有发育层数多、 渗透率低、单层厚度薄等特点；

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The first optimum model is established with the target function of the frame's weight as well as with the design variables of the beam's single layer thickness.

首先以纵梁各部分单层厚度为设计变量，建立了以车架重量为目标函数的优化模型并进行了优化研究，取得了较好的优化效果。

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For any single layer within a system the actual thickness is permitted to be 10% less then the minimum thickness.

对仅由一层涂层构成的系统，实际的厚度可以允许比最小厚度值小10%。

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