Abstract
In the process design and reuse of marine component products, there are a lot of heterogeneous models, causing the problem that the process knowledge and process design experience contained in them are difficult to express and reuse. Therefore, a process knowledge representation model for ship heterogeneous model is proposed in this paper. Firstly, the multi-element process knowledge graph is constructed, and the heterogeneous ship model is described in a unified way. Then, the multi-strategy ontology mapping method is applied, and the semantic expression between the process knowledge graph and the entity model is realized. Finally, by obtaining implicit semantics based on case-based reasoning and checking the similarity of the matching results, the case knowledge reuse is achieved, to achieve rapid design of the process. This method provides reliable technical support for the design of ship component assembly and welding process, greatly shortens the design cycle, and improves the working efficiency. In addition, taking the double-deck bottom segment of a ship as an example, the process knowledge map of the heterogeneous model is constructed to realize the rapid design of ship process, which shows that the method can effectively acquire the process knowledge in the design case and improve the efficiency and intelligence of knowledge reuse in the process design of the heterogeneous model of a ship.
Highlights
In the process design and reuse of marine component products, there are a lot of heterogeneous models, causing the problem that the process knowledge and process design experience contained in them are difficult to express and reuse
Aiming at the problem that the knowledge contained in the existing heterogeneous models is difficult to express the influence on process knowledge reuse and sharing, a structured modeling method that uses process knowledge graph to uniformly represent heterogeneous models is proposed in this paper
Case-based reasoning (CBR) can process the process knowledge stored in the semantic model, so it is used to retrieve and reuse the existing process knowledge to obtain the candidate welding process information
Summary
Along with the continuous development of CAD system in the field of ship construction and the widespread application, a large number of heterogeneous model and the associated process data and knowledge continuously generated and stored in the knowledge base of the enterprise, and for the unity of the heterogeneous model representation method is on the increase, our work inspired by recent progress in several different a reas[3], such as the knowledge map and knowledge reuse research, we will review below. The similarity of concepts is evaluated, the mapping rules are formulated according to the similarity results, and the mapping rules are corrected to ensure that the unified semantic representation of heterogeneous models is realized in the process knowledge graph. As there are related concepts and semantic connections between the various process knowledge ontology contained in the ship heterogeneous model, the mapping relationship between the ontology is established. The semantic similarity of the concepts in the heterogeneous model is calculated through the corresponding mapping rules, to ensure that the unified semantic expression of the ship heterogeneous model is realized in the process knowledge graph. A case-based reasoning (CBR) method is needed to retrieve and reuse assembly and welding process knowledge stored in heterogeneous ship models. In the process acquisition interface, the system gives a sorted list of the most relevant cases, and the case structure and corresponding process design principles can be viewed through the case process information interface to realize the reuse of case knowledge
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