By abstracting of relative position, orientation and topology relation between part function surfaces as a qualitative symbol set, the conceptual part structure qualitative models are presented.

通过将零件上功能表面之间的相对位置、朝向以及拓扑关系抽象成定性符号集合，建立了概念零件结构定性模型。

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A hybrid algorithm for topology optimization of trusses with discrete variables is developed which combines relative difference quotient algorithm with chaos optimization.

将相对差商法和混沌优化结合起来，形成求解离散变量桁架结构拓扑优化设计的混合算法。

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Network simplification is significant in enhancing computing speed and reducing memory occupation of programs relative to ventilation network topology relation.

网络简化对提高与通风网络拓扑关系相关的计算程序的运算速度以及降低计算机内存占有量也具有重要意义。

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