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为实现概念结构与公差并行设计，提出了基于功能表面的公差表示模型。
According to the requirements of concurrent design of conceptual design and tolerance design, tolerance representation model based on function surface was studied.
具有紧密公差的尺寸表示该零件必须恰当地与某些其它零件配合。
Dimensions given close tolerances mean that the part must fit properly with some other part.
研究了公差网络中的各公差对相应的旋量参数的约束不等式表示，从而构成了公差大小优化的不等式约束。
Screw parameters in VGCN specified by tolerances in TN are expressed as inequation, which is inequation constraint in optimization of tolerance values.
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