Research Of Hull Block Building Sequence Based On DAP

Hull block assembly is a very important stage of shipbuilding. Shipyard now has a high requirement on block assembly ability with the development of shipbuilding industry and improvement of large tonnage vessels built. Shipyard in china still has a big difference on hull block assembly efficiency compared with foreign advanced yard. The period of one block building in Japan and South Korea in about 7 to 10 days, but Chinese average time is about 25 to 35 days. So it is very important to analyze the block building sequence.The design of DAP also consists of structure outfitting pars. The outfitting parts have less relation with system can be fitted during hull sub assembly and unit assembly.The main contents of this paper as follows after described the background, aim and meaning of the project:1. Study the character of unit assembly based on mid-product theory. Describe the piece management and movement. On this base shipyard can product with high efficiency and improve working condition: High stage working changed to plat areas; closed working changed to open areas; Reducing welding work at grand assembly stage and deformation at the same time.2. Take use of fuzzy comprehensive assessment based on one block model, with the parameters of fabrication work, fabrication condition, length of welding etc., analyze these parameters, choose one best building procedure from four basic procedure.3. Analyze the character and types of structure outfitting; analyze the relation between hull structure and structure outfitting parts with examples. Shipyard can get the result of shorting building time with structure outfitting to be fitted at forehead stages.4. The practice of DAP. Study different types of blocks based on DAP, put the analyze method into use to all types of blocks of all vessels building at shipyard.