基于知识的汽车覆盖件可制造性评价系统

提出了一种基于知识的汽车覆盖件可制造性评价系统结构，研究了实现系统的关键技术．该系统将基于成形工艺知识的定性分析与基于反向法有限元数值模拟的定量分析相结合进行覆盖件的成形性分析，利用成本知识估算覆盖件及其模具的制造成本．其工作流程为：首先，利用基于事例推理／基于规则推理的混合推理技术对覆盖件实体模型进行结构工艺性分析；其次，调用反向法有限元软件模拟成形过程；然后，再次利用上述混合推理技术进行覆盖件工艺方案设计；最后，利用基于事例推理技术和经验公式，估算覆盖件及其模具的制造成本．该评价系统将覆盖件成形性分析和制造成本评估有机结合，在早期设计阶段，就能对覆盖件设计方案快速、全面和比较精确的评价．

Knowledge-Based Manufacturability Evaluation System for Automotive Panels

This paper presented the architecture of knowledge based manufacturability evaluation system for automotive panels (KMESAP) and researched the key technologies to realize the system. KMESAP combines the knowledge based formability qualitative analysis and the finite element numerical simulation based on inverse approach for automotive panels. And it can assess manufacturing costs of the panels and dies using knowledge of cost assessment. The process is as follows:(1) do formability qualitative analysis for the panel solid model by hybrid reasoning techniques of case based reasoning (CBR) and rule based reasoning (RBR); (2) simulate forming process by transferring the model to FEA code with one step solver; (3) do primary forming process design by forementioned reasoning techniques; and (4) assess manufacturing costs of the panels and dies by CBR and empirical formula. KMESAP integrates formability analysis and manufacturing cost assessment for automotive panels so as to evaluate the design scheme promptly, comprehensively, and relatively accurately at the early design stage.