中文摘要：

机械产品零部件的设计缺陷是影响机械产品质量、可靠性与安全性的重要因素。将没有完成设计的机械产品零部件作为虚拟零件,通过机械产品零部件之间的装配约束关系构建约束树,并将虚拟零件注入到约束树中,将节点的可信度作为评价节点设计参数可靠性的依据,依据约束树建立设计缺陷推理模型,将约束树中的子节点作为父节点推理的前提条件,从叶节点开始沿着约束树的节点自底向上逐层推理。当虚拟零件的设计工作完成后,其设计参数的变动会破坏约束树原始的约束关系,约束树中节点的推理值的大小反映了原始约束关系被破坏的程度,依据约束树中各节点的推理值来确定需修正设计参数的零件,通过节点设计缺陷的传递因子来反映装配体零部件之间设计缺陷传递的规律,通过分析1TP＋3TPS并联机构的设计缺陷推理结果,验证了该方法能有效辨识机械产品中存在的设计缺陷。

英文摘要：

Design defects among parts for mechanical products are an important factor for affecting design quality and design efficiency of mechanical products.It takes parts which the design efforts have not been accomplished for mechanical products as a virtual part,and constraint tree is founded based on the assembly constraint relation among parts.Virtual part is injected into constraint tree,and the node confidence will be treated as a condition on evaluating design parameters reliability of nodes,then design defects inference model is constructed depends on the whole constraint tree,and child node of constraint tree is treated as an inference condition for father node,and every level node of constraint tree will be inferred from the bottom levels leaf node to top levels root node.If design efforts of virtual parts will have been accomplished,design parameters variation of virtual parts will destroy the primitive constraint relation of constraint tree,and the node inference value of constraint tree have reflected the status of the primitive constraint relation,and the design parameters of parts needs to be amended in term of the node inference value of constraint tree,and the design defects transfer factor for constraint tree nodes have reflected design defects transfer law among parts for assembly,by analyzing the inference results of 1TP＋3TPS parallel mechanism,design defects of mechanical products are identified effectively.