外文翻譯--自動(dòng)焊接操作系統(tǒng)

1、出處： 出處： International Journal of Production Economics, 1999, 60: 203-209.An automated welding operation planning systemfor block assembly in shipbuildingKyu-Kab Cho*, Jung-Guy Sun, Jung-Soo OhAbstractThe block assembly p

2、rocess is one of the most important manufacturing processes for shipbuilding. Since block is composed of several steel plates and steel sections with predetermined shapes according to ship design, the welding operation p

3、lanning to construct a block is a critical activity for shipbuilding, but this activity has traditionally been experience based. Thus, it is required to develop an automated welding operation planning system to assemble

4、blocks. This paper describes the development of an automated welding operation planning system for block assembly in shipbuilding. Based on the information about parts, topological relationship between parts and assembly

5、 sequences for block, the developed system performs the determination of welding postures, welding methods, welding equipment and welding materials. The developed system implemented successfully for real blocks construct

6、ed in shipyard.Keywords: Block assembly; Expert system; Operation planning; Welding process1. IntroductionShipbuilding is traditionally a labor-intensive assembly industry that employs the welding process as a basic prod

7、uction technology. In shipbuilding, there are several types of manufacturing process planning for cutting and bending, assembly, out- fitting, and erection. Among these process planning activities, the assembly process p

8、lanning is by far the most important, since the construction process for a hull block comprises approximately 48~50% of the total shipbuilding process [1,2]. The main operation for block assembly is the welding operation

9、. The welding operation planning problems in block assembly are very difficult to solve because all blocks are different in size, type, and constituting sub-assemblies that depend on the types of ships. Also, since this

10、activity has traditionally been experienced-based, reasoned by considering connection types and positional direction between two connected parts, direction information of assembly base part, existence of turnover, and as

11、sembly level.Connection types are classified into butt type (B) and fillet type (T), as shown in Fig. 2. The four types of welding postures, down posture (D), overhead posture (O), horizontal posture (H), and vertical po

12、sture (V), are considered in this paper, as shown in Fig. 2 [5,6]. The most stable and easiest welding posture is the down welding posture, and the most difficult one is the overhead welding posture. The welding operator

13、 determines an efficient welding posture according to the working conditions.For relationship of connection between two parts that are welded, one part is considered as the base and the other is connected to the base. Th

14、e part that is considered as a base is represented as PartFrom and the other that is connected to the base is represented as PartTo. The levels of block assembly to assemble steel plates and sections into the final block

15、 are classified into subassembly (SA) level, unit block assembly (UBA) level, and final block assembly (FBA) level.Subassembly levels may be divided into small subassembly (SSA) levels and intermediate subassembly (ISA)

16、levels according to the size and weight of the subassembly as shown in Fig. 3.For determining welding postures, the block assembly levels are classified into two groups. The first group is the small subassembly level; th

17、e second group consists of the intermediate subassembly, the unit block assembly, and the final block assembly levels. The reason for this grouping is that there is no turnover process in the small subassemblylevel, but