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产品设计对产品的质量与成本起着非常重要的作用．产品的整个设计过程可以分为三个阶段，即系统设计、参数设计和容差设计．本文将产品设计过程视为对产品生产性损失的优化过程，通过对三次设计空间代化过程映射机理的分析，导出了三次设计之间的函数关系。通过对系统设计与产品生产性损失的函数表达，阐明了系统设计对产品生产性所起的决定性作用
Product design plays a very important role in product quality and cost. The entire product design process can be divided into three phases, namely, system design, parameter design and tolerance design. In this paper, the product design process is regarded as the optimization process of product loss. Through the analysis of the mapping mechanism of the three design space generation process, the functional relationship between the three designs is derived. Through the function of system design and product loss, this paper expounds the decisive function of system design on product productivity