Research on a Self-enhancing Maintenance Knowledge Base Method based on Fault Causal Association Probabilities
To address the problems of over-reliance on expert experience, knowledge fragmentation, and low diagnostic efficiency in the intelligent maintenance of widely distributed complex equipment, this paper proposes an intelligent maintenance method based on a self-enhancing dynamic knowledge base. First, a structured integration framework for multi-source heterogeneous maintenance knowledge is established to achieve the systematic organization of fault cases and service records. Second, a "high-incidence fault probability model" based on statistical analysis of historical fault data is proposed, forming a priority-based diagnostic strategy of “high-incidence faults first, low-incidence faults later . Furthermore, a large language model is integrated to enable natural language interaction and accurate knowledge retrieval. In addition, a knowledge credibility evolution and closed-loop optimization mechanism based on maintenance log feedback is introduced, driving the knowledge base to evolve from static storage into a dynamic self-enhancing system. On this basis, a progressive knowledge architecture consisting of “Level 1: authoritative knowledge, Level 2: knowledge to be verified, and Level 3: AI-derived knowledge”, together with its self-enhancing interaction workflow is designed. The proposed method is further validated through practical after-sales maintenance scenarios covering three stages: work-order submission, fault analysis, and case accumulation. The proposed method is further validated through practical after-sales maintenance scenarios covering three stages: : work-order submission, fault analysis, and case accumulation . The results show that the proposed method can significantly improves the overall efficiency of fault description, localization, and troubleshooting, thereby providing a systematic solution with continuous self-enhancing capability for the intelligent maintenance of complex electro-mechanical-hydraulic integrated equipment.
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