Browse > Article
http://dx.doi.org/10.7837/kosomes.2022.28.7.1267

A Study on the Determination of Minimum Welding Condition Based on Structural Strength under Launching for Tandem Blocks  

Myung-Su Yi (Department of Naval Architecture and Ocean Engineering, Chosun University)
Joo-Shin Park (Ship and Offshore Research Institutes, Samsung heavy industries)
Publication Information
Journal of the Korean Society of Marine Environment & Safety / v.28, no.7, 2022 , pp. 1267-1273 More about this Journal
Abstract
Although the Korea shipbuilding industry has recently been receiving most of the orders for ships in the world, production processes are being disrupted due to a shortage of manpower at the production site. This is because the workers quit the shipyard as both work and wages were reduced due to the long slump in the shipbuilding industry. The main reason for the increase in orders was the large-scale orders for Qatar LNG carriers, and the situation in which the technical specifications required for ships are becoming more complex is also working to an advantage. Because the contract delivery time is of utmost importance for ships, the dock launch plan is the most important management item among the shipyard's major processes. The structure to be built in the dock may be a hull that has left the design work or a finished vessel, and in some cases, it is often at the level of some blocks of the hull. When launching, the hull is affected by the hogging or sagging moment due to the fluid force, and securing the safety of the structural strength of the block connection is of utmost importance. In a normal process, the connecting member launches after welding has been completed, but in actual shipbuilders, quick decision-making is needed on the conditions for securing structural safety to comply with the docking schedule. In this study, a detailed analysis method and applicability using a bending stress evaluation method and finite element analysis modelling were analyzed to rationally judge the above-mentioned problems from an engineering point of view. The main contents mentioned in the thesis can be used as good examples when conducting similar structural strength evaluations in the future.
Keywords
Dock; Launching; Structural strength; Engineering; Bending stress; Finite element analysis;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
연도 인용수 순위
1 ABS(2019), GUIDE FOR ALTERNATIVE REQUIREMENTS FOR HULL CONSTRUCTION OF VESSELS INTENDED TO CARRY VEHICLES (130 METERS OR MORE IN LENGTH), Section 6, Acceptance Criteria, pp. 51-52.
2 Choi, J. H. and J. H. Park(2008), A Study on Docking Analysis for Conventional LNGC, Special Issue of the Society of Naval Architects of Korea, pp. 10-15.
3 Kang, B. G., S. B. Shin, and D. H. Park(2014), A Study on Design of Fillet Weld Size for Stiffener in the Hull Bottom of Crude Oil Tanker, Journal of Welding and Joining, Vol. 32, No. 1, pp. 79-86.   DOI
4 Kim, S. J., K. C. Seo, and J. S. Park(2020) Development of the Vertical Ladder using a High-Strength Aluminium Alloys (6082-T6), Journal of the Korean Society of Marine Environment & Safety, Vol. 26, No. 6, pp. 698-705.   DOI
5 KR(2021), SeaTrust-HullScan Uses Guide, Section Creation, Rule Scantling Calculation, pp. 76-92.
6 Lee, J. H., J. M. Oh, and K. C. Seo(2017), Development of Structural Design Program to apply the Twin-Hull Car-ferry, Journal of the Korean Society of Marine Environment & Safety, Vol. 23, No. 6, pp. 731-738.   DOI
7 MSC Software(2012), Patran 2012 User's Guide, Chapter 6-, Material modeling, pp. 125-136.
8 Yun, J. O. and C. I. Oh(2012), Trend of Welding Deformation Analysis for Ship Structure, Journal of KWJS, Vol. 30, No. 2, pp. 147-150.
9 IACS(2021), Common Structural Rules for Bulk Carriers and Oil Tankers, Part 1, Chapter 5-hull girder strength, Section 1-hull girder yield strength, pp. 323-329.