According to the requirements of concurrent design of conceptual design and tolerance design, tolerance representation model based on function surface was studied.
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。
The function surface can be expressed by analytic expression and constructed easily.
函数曲面可由解析函数表达式来表达，建模方便。
Spatial structure presents colorful shape surface, which can be classified as function surface and free surface.
空间结构具有丰富多彩的外形曲面，这些曲面按表达式可分为函数曲面与自由曲面。
Spatial structure presents colorful shape surface, which can be classified as function surface and free surface.
空间结构具有丰富多彩的外形曲面，这些曲面按表达式可分为函数曲面与自由曲面。
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