中文摘要：

为保证概念结构设计的可行性与经济性，提出了将公差设计研究提前到概念设计阶段的思想，并研究了其中的关键技术。首先基于一种结构不断生长的独特设计思路，建立了结构与公差同步设计的过程模型和相应的公差表示模型；然后研究了在设计过程中自动生成局部尺寸链和全局尺寸链的方法，给出了公差同步设计，并根据设计结果提出了概念设计优化的整体框架，实现了基于公差的概念设计优化；最后以活塞夹具设计为例，验证了本方法的有效性。

英文摘要：

To ensure the feasibility of conceptual-structure design and its cost saving, the tolerance design was set in the conceptual design stage and its key technologies were studied. Firstly, the process model of synchronous structure and tolerance design and the corresponding tolerance representation model were constructed based on a structure growth design methodology. Then the methods for the auto-generation of local dimension chain and overall dimension chain in the design process were studied. The whole frame of synchronous tolerance design and subsequent conceptual design optimization based on the tolerance results was established, which could optimize the conceptual design based on tolerance. Finally, the validity of the methodology was proved by piston clamp design.