Abstract: To improve the design knowledge reuse level and retrieval precision of case-based reasoning method in firearm scheme design, a design scheme and a revise method are proposed based on case-based reasoning for variant design process. A case-based reasoning framework is firstly established, including knowledge base, main reasoning engine, case retrieval module and rule-based revise module. For three different design requirements, a corresponding similarity calculation method is then proposed to improve the case retrieval accuracy. Similarity cases obtained in retrieval phase are quantifiably and adaptively revised to get the final design scheme by introducing the concept of rule knowledge. A firearm rapid scheme design prototype system is developed, and a barrel design example is presented to verify the accuracy of retrieval process and the effectiveness and practicality of the proposed method.

Key words: ordnance science and technology, case-based reasoning, variant design, case revisal, scheme design