• Title, Summary, Keyword: pre-erection

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Heuristic Algorithms for Resource Leveling in Pre-Erection Scheduling and Erection Scheduling of Shipbuilding (조선 선행탑재 및 탑재 일정계획에서의 부하평준화를 위한 발견적 기법)

  • Woo, Sang-Bok;Ryu, Hyung-Gon;Hahn, Hyung-Sang
    • IE interfaces
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    • v.16 no.3
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    • pp.332-343
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    • 2003
  • This paper deals with pre-erection scheduling and erection scheduling in shipbuilding. Among shipbuilding scheduling, the ship erection scheduling in a dock is one of the most important since the dock is the most critical resource in a shipyard. However, it is more reasonable to consider pre-erection scheduling and erection scheduling as unified because they compete with the common constrained resources such as labor, crane, space, and so on. It is very hard to consider two scheduling problems simultaneously, and hence, we approach them sequentially. At first, we propose space resource leveling heuristics in pre-erection scheduling given erection date. And then, considering the manpower resource determined by pre-erection scheduling, we also propose manpower resource leveling heuristics in erection scheduling. Various experimental results with real world data show that the proposed heuristics have good performance in terms of scheduling quality and time.

Prototype of Block Tracing System for Pre-Erection Area using PDA and GPS (PDA 및 GPS를 이용한 옥외 작업장 블록 위치 추적 시스템 개발)

  • Shin, Jong-Gye;Lee, Jang-Hyun
    • Journal of the Society of Naval Architects of Korea
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    • v.43 no.1
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    • pp.87-95
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    • 2006
  • There are hundreds of ship blocks which are under the block assembly, painting, and outfitting assembly works in the pre-erection shops of shipyard. Generally, each block is planned to be processed in a pre-erection shop according to the block type by the long-term production-scheduling before six months. However, many blocks can't be processed in the planned time and the planned shop since the before and after block-processing changes or delays the planned sequential works in pre-erection shops. Therefore, it is essential to monitor the current location of each block and work in process to cope with the changed situation of pre-erection shops. Present study integrates PDA, GPS, and CDMA not only to chase the location of each block but also to exchange the pre-erection work order and the work report between the production-scheduling server and the production managers in the pre-erection shops. This study shows a prototype for the block tracing and process monitoring in the pre-erection shops.

Spatial Scheduling in Shipbuilding Industry

  • Duck Young Yoon;Varghese Ranjan;Koo Chung Kon
    • Proceedings of the Korea Committee for Ocean Resources and Engineering Conference
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    • pp.106-110
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    • 2004
  • In any large heavy industry like that of ship building, there exist a lot of complications for the arrangement of building blocks optimally for the minimal space consumption. The major problem arises at yard because of laxity in space for arranging the building blocks of ship under construction. A standardized erection sequence diagram is generally available to provide the prioritised erection sequence. This erection sequence diagram serves as the frame work. In order to make a timely erection of the blocks a post plan has to be developed so that the blocks lie in the nearest possible vicinity of the material handling devices while keeping the priority of erection. Therefore, the blocks are arranged in the pre-erection area. This kind of readiness of blocks leads to a very complex problem of space. This arises due to the least available space leading to an urgent need of an availability of intelligent spatial schedule without compromising the rate of production. There exists two critical problems ahead namely, the spatial occupation layout of pre-erection area and the emptying pattern in the spatial vicinity. The block shape is assumed be rectangular. The related input data's are the dates of erection (earliest as well as the latest), geometrical parameters of block available on pre-erection area, slack time and the like.

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Development of the Pre-erection Block Arrangement System for Deckhouse (선실 PE장 정반배치 계획수립 시스템 개발)

  • Ha, Seung-Jin;Kim, Ji-On;Choi, Tae-Hoon
    • Special Issue of the Society of Naval Architects of Korea
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    • pp.79-88
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    • 2007
  • In this study, we improved the layout of deckhouse pre-erection area where erects the blocks and developed the pre-erection block arrangement system for the improvement of productivity and effectiveness. The major operating point of the pre-erection area is to fabricate as many as possible that has restrict area and working plate. The developed system has information management module, scheduling module, schedule control module, statistics module, and information integrate module. The heuristic algorithm is issued and evaluated with real data. And genetic algorithm is used for the evaluation of issued it.

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A Study on the Erection Scheduling in the Shipbuilding Using Constraint Satisfaction Technique (제약 만족 기법을 이용한 조선 산업에서의 탑재 일정 생성에 관한 연구)

  • Kim, Ki-Dong;Jang, Yong-Sung
    • Journal of Industrial Technology
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    • v.19
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    • pp.91-99
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    • 1999
  • The dock is the most important resource in shipbuilding yard. Among the shipbuilding schedules, the ship erection schedule in a dock is preferentially built. As results of it, the other schedules(machining in plants, block assembly, pre-painting, pre-rigging, painting and etc) are made. In this study, ship erection scheduling is formulated using ILOG Scheduler. This study is to develop a new problem solving method for ship erection to make an effective schedule based on Constraint Satisfaction Technique(CST).

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Specificity of Prefounded Column for Top-Down Construction (Top-Down 공사용 선기초기둥의 특성)

  • Kang, Seung-Ryong;Rhim, Hong-Chul;Kim, Seung-Weon;Park, Dae Young;Kim, Dong-Gun;Song, Jee-Yun;Jeong, Mee-Ra
    • Proceedings of the Korean Institute of Building Construction Conference
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    • pp.135-139
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    • 2008
  • For deep basement construction of buildings downtown, the usage of Top-Down Method is increasing as much as ever from strong demand. One of the essential elements for the construction by Top Down Method is the pre-founded columns, which are installed in the ground and on which a building is installed. The fact that the pre-founded columns are placed in the ground makes them susceptible to its plumbness; this aspect distinguishes pre-founded columns from general columns. However, there are no criteria for erection tolerance. Therefore, field-measured-data concerning out-of-plumb of pre-founded columns in the construction field should be accumulated and investigated so that criteria and specifications for the erection tolerance of pre-founded columns may be established through the understanding of its aspects. In this paper, we investigate out-of-plumb of pre-founded columns for the construction case and analyze its aspects, and propose considerations for design and construction phase.

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Application of Sensor Technology for the Efficient Positioningand Assembling of Ship Blocks

  • Lee, Sang-Don;Eun, Seong-Bae;Jung, Jai-Jin;Song, Ha-Cheol
    • International Journal of Naval Architecture and Ocean Engineering
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    • v.2 no.3
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    • pp.171-176
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    • 2010
  • This paper proposes the application of sensor technology to assemble ship blocks efficiently. A sensor-based monitoring system is designed and implemented to improve shipbuilding productivity by reducing the labor cost for the adjustment of adequate positioning between ship blocks during pre-erection or erection stage. For the real-time remote monitoring of relative distances between two ship blocks, sensor nodes are applied to measure the distances between corresponding target points on the blocks. Highly precise positioning data can be transferred to a monitoring server via wireless network, and analyzed to support the decision making which needs to determine the next construction process; further adjustment or seam welding between the ship blocks. The developed system is expected to put to practical use, and increase the productivity during ship blocks assembly.

A Study for Deformation During the Erection of LNG Carrier's Motor/Compressor Room (액화천연가스운반선 모터/컴프레서 룸의 탑재 시 처짐에 대한 검토 사례 소개)

  • Oh, Chang-Min;Jang, Yoo-Soo;Oh, Dong-Yoon;Yang, Jin-Seok
    • Special Issue of the Society of Naval Architects of Korea
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    • pp.1-6
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    • 2007
  • To improve productivity of the LNG carriers which are growing bigger and bigger, many researches are being carried out by shipyards. In this regard, we reviewed possible problems which could occur during the erection of 216K LNG carrier's motor/compressor room with all outfittings pre-installed. As a first item, the weights of hull and outfittings were precisely estimated to make sure that the erection is carried out within yard's capability. In the next place, deflection and safety of the structure were verified by FEM analysis. As a result, the erection was finished successfully and yard's productivity was also improved. This review is a good example which shows the importance of through study and preparation for improving yard's productivity which is already reached its limit.

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Enhanced Productivity By Development Of Isometric Pre-Erection (입체 PE 개발을 통한 생산성 향상)

  • Lee Jongseob;Kim Younghwan;Joe Jongrae
    • Special Issue of the Society of Naval Architects of Korea
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    • pp.185-191
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    • 2005
  • Korean naval architecture company today is making researches in expansion of productivity of their own accord. In result, they have accomplished many technical developments like a ground shipbuilding system. For our company's productivity expansion in our yard's limited condition (the facility, P.E area, stock area), we develop isometric pre-erection method that turn into a possibility to maximize our facility use, minimize our dock period.

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Three-Dimensional Grillage Analysis of Reaction Forces on Supports of Pre-Erection Block (격자구조모델을 이용한 선체 PE블록의 반목 반력 해석 시스템 개발)

  • Ryu, Cheolho;Kim, Sungchan;Kim, Dong Geun
    • Journal of Ocean Engineering and Technology
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    • v.27 no.4
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    • pp.1-8
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    • 2013
  • Many PE (pre-erection) blocks are supported by wooden, concrete, or steel supports when they are stocked in the outdoor areas of a shipyard. Their positions and numbers are planned on the basis of the workers' experience. Recently, many shipyards have been making PE blocks with various shapes and weight distributions because of the variety of ships and building technologies. Therefore, it is now necessary to deal with blocks that they have no experience with. We propose a method to conveniently and quickly evaluate the structural safety of PE block supports, without the need for special knowledge and technology related to structural analysis. This method can reduce the large number of man hours (MH) normally needed for the analysis. The three-dimensional grillage analysis is performed for a simplified grillage model of a PE block. For efficiency, the grillage model of the PE block is automatically built from its three-dimensional CAD model, and its weight is also automatically distributed on the grillage model. The integrated system has been comprehensively implemented to perform the grillage analysis for the reaction forces on block supports. This paper describes how to make a grillage model of a PE block and estimate the weight distribution of the block on this grillage model. These steps are verified by comparing the supports reaction forces to those of the 3D finite element analysis for the PE blocks that are provided by a shipyard.