[논문]Ship block assembly sequence planning considering productivity and welding deformation

Kang, Minseok; Seo, Jeongyeon; Chung, Hyun

doi:10.1016/j.ijnaoe.2017.09.005

Ship block assembly sequence planning considering productivity and welding deformation 원문보기

International journal of naval architecture and ocean engineering, v.10 no.4, 2018년, pp.450 - 457

Kang, Minseok (Graduate School of Ocean Systems Engineering, Dept. of Mechanical Engineering, KAIST) , Seo, Jeongyeon (Graduate School of Ocean Systems Engineering, Dept. of Mechanical Engineering, KAIST) , Chung, Hyun (Department of Naval Architecture & Ocean Engineering, Chungnam National University)

Abstract ▼ AI-Helper

The determination of assembly sequence in general mechanical assemblies plays an important role in terms of manufacturing cost, duration and quality. In the production of ships and offshore plants, the consideration of productivity factors and welding deformation is crucial in determining the optimal assembly sequence. In shipbuilding and offshore industries, most assembly sequence planning has been done according to engineers' decisions based on extensive experience. This may result in error-prone planning and sub-optimal sequence, especially when dealing with unfamiliar block assemblies composed of dozens of parts. This paper presents an assembly sequence planning method for block assemblies. The proposed method basically considers geometric characteristics of blocks to determine feasible assembly sequences, as well as assembly process and productivity factors. Then the assembly sequence with minimal welding deformation is selected based on simplified welding distortion analysis. The method is validated using an asymmetric assembly model and the results indicate that it is capable of generating an optimal assembly sequence.

주제어

AI 본문요약
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문제 정의

The weight factors are determined by case-based reasoning based on empirical factors and the sum of the weights is 1. The objective of this function is to find assembly sequences of minimal cost.
This paper proposes an assembly sequence planning method considering productivity and welding deformation in ship and offshore manufacturing in order to achieve higher quality and better productivity. The proposed method defines the part types for all parts in the target assembly based on case-based reasoning and takes into account constraints like part movement, part location, welding type and simultaneous welding conditions.

제안 방법

That is, in order to connect two parts of another connection type after connecting two parts of a certain connection type, a delay time is incurred owing to preparation processes such as moving equipment and resetting the welding condition. Since delay time varies widely according to the work environment and conditions, the proposed method considers the tool change as a number of occurrences and defines a tool change when the current connection type is different from the connection type of the previous process. The total tool change amount is defined as the sum of the number of tool changes during the assembly process as follows:
1. The first step of the proposed method is to define the geometry parameters for each part and relationships between the parts in the target assembly. These parameters and relationships are used to define constraints at each of the following steps.
This paper proposes an assembly sequence planning method considering productivity and welding deformation in ship and offshore manufacturing in order to achieve higher quality and better productivity. The proposed method defines the part types for all parts in the target assembly based on case-based reasoning and takes into account constraints like part movement, part location, welding type and simultaneous welding conditions. In addition, welding deformations of different magnitudes in accordance with different assembly sequences are considered.
The proposed method maintains a framework for determining a geometrically feasible assembly sequence. In addition, by defining productivity-related factors as constraint factors to be considered in the manufacturing process, the range of solutions for determining the optimal assembly sequence could be reduced.
These constraint conditions help to consider productivity factors in assembly sequence planning. The proposed method takes into account simultaneous welding, turn-over, tool change, and interference direction as productivity factors.
, 2014a,b). This method was applied to evaluate the reduction of welding distortion during the cooling stage by external restraints imposed normal to the plate. In addition, elasto-plastic-based Strain as Directed Boundary method (SDB) was proposed and applied to simple butt joint (Ha, 2011).

이론/모형

As an alternative, inherent strain based simplified analysis is suitable owing to its fast and qualitatively reasonable analysis characteristics. Therefore, the proposed method uses elasto-plastic-based Strain as Directed Boundary method (SDB) for the analysis of welding distortion due to its more simple and faster applicability than other methods.

참고문헌 (19)

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상세보기
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원문보기 상세보기
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원문보기 상세보기
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상세보기
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원문보기 상세보기
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상세보기
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