关键词: 设计活动, 设计缺陷, 缺陷评估, 贝叶斯网络, 产品设计

Abstract: To research the generation of design defect systematically and its developing process with design activity from perspective of design defect formation mechanism,based on the design activity of mechanical product design processes,the formation and development processes of design defect were researched by analyzing the types of design activity as well as temporal association models between activities,and an assessment model of defect was constructed by taking the design activities as Bayesian network nodes.A case study showed that the proposed model could estimate quantitatively the probability of the product design defect caused by design activities.Moreover,the critical design activities with high probability of defect occurrences could be identified by the proposed model,which provided a criterion to prevent and control design defect occurring in the product development processes.

Key words: design activity, design defect, defect assessment, Bayesian network, product design