Evaluating failure risk for product design scheme based on knowledge model
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摘要: 考虑失效模式间的关联性,提出了一种基于知识模型的机械产品设计方案失效风险评估与优选方法.该方法使用数据聚类法鉴别失效模式的主要关联关系,给出了失效模式关联系数的计算方法,实现了对失效模式关联知识的有效获取;并在产品"功能—失效模式—失效风险"知识表示的基础上,通过二维"屋顶"形三角阵和三维立方阵实现了对失效模式关联系数的表达,建立了产品"功能—失效模式—失效风险—模式关联"知识模型.在知识模型的支持下,研究了加权线性合成的关联失效模式严重度评估方法,给出了失效模式和产品功能的风险优先数计算方法,实现了基于知识的机械产品设计方案失效风险评估过程与优选.最后,通过实例说明了上述方法的有效性.Abstract: Considered the relationship among failure modes, a failure risk evaluation and optimization method for mechanical product design scheme based on knowledge model was proposed. The main relationship among failure modes was identified by data clustering. The method of computing the relationship coefficient of failure mode was given, thereby the relationship knowledge for failure mode could be effectively obtained. On the basis of the knowledge model of "function-failure mode-failure risk", "roof" triangle matrix and three-dimension cube were used to represent the relationship coefficient of failure mode as well as the knowledge model of "function-failure mode-failure risk-mode relationship" was set up. By means of the knowledge model, the severity evaluation method of relationship failure mode based on weighted linear synthesis was studied, and the approach to making risk priority number (RPN) of failure mode and product function was given, then the evaluation and optimization based on product failure risk knowledge for mechanical product design scheme were presented. Finally a case was studied to illustrate the proposed method.
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