CAPP For Block Assembly In Shipbuilding

In 21st century, the shipbuilding pattern keeps evolving in the world. China is pursuing after Korea and Japan and ranks third in the world. With the rapid increase of the shipbuilding industry in China, it is possible that our country will exceed Korea and Japan and becomes the largest country in the field of shipbuilding. The shipbuilding enterprises are facing the phase which transits from traditional pattern to modern pattern. The transition has been prevailed for a long time and shipbuilding pattern led by information technology is gradually developing. Along with the use of some technologies such as CIMS, parallel engineering, agile manufacture in ship industry, the need of CAPP by shipbuilding enterprises is becoming much more urgently. Above all, the thesis studies block-assemble CAPP technology in shipbuilding. The following parts are included in the research:1. The thesis studies the hull-assemble standard technology process and analyzes module-shipbuilding basic characters, summarize the knowledge needed in hull block assembly process and presents the knowledge with production rule. All the knowledge helps to study computer aided process design of the hull assemble and module-shipbuilding topic. Combining with the trend of CAPP technology, the structure of CAPP system which is oriented to ship block assembly is established.2. A generating method of block assembly weld process based on rule reasoning is introduced. The block information model and part information model are built. The rule factors in geometry, physics and weld are considered in the model. Finally the automatic generation of assembly rules process is achieved.3. The confirmation of weld process parameters based on BP neural netwolk is introduced. Meanwhile, the study swatch of BP neural netwolk is established.4. In this thesis, the user-defined format of process card is given. The 4. In this thesis, the user-defined format of process card is given. The format can express the results of process planning well and it faces data distill and data exchange, which builds good foundation for future development of similar thesis.