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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of the Society of Naval Architects of Korea
Journal Basic Information
Journal DOI :
The Society of Naval Architects of Korea
Editor in Chief :
Volume & Issues
Volume 46, Issue 6 - Dec 2009
Volume 46, Issue 5 - Oct 2009
Volume 46, Issue 4 - Aug 2009
Volume 46, Issue 3 - Jun 2009
Volume 46, Issue 2 - Apr 2009
Volume 46, Issue 1 - Feb 2009
Selecting the target year
Characteristics of the Flow and Heat Transfer around a Wavy Cylinder
Lee, Chang-Yeol ; Seo, Jang-Hoon ; Hung, Pham-Anh ; Yoon, Hyun-Sik ; Chun, Ho-Hwan ;
Journal of the Society of Naval Architects of Korea, volume 46, issue 1, 2009, Pages 1~9
DOI : 10.3744/SNAK.2009.46.1.001
Three-dimensional characteristics of fluid flow and heat transfer around a wavy circular cylinder having sinusoidal variation in cross sectional area along the spanwise direction are numerically investigated using the immersed boundary method. The three different wavelengths of
at the fixed wavy amplitude of 0.1 have been considered to investigate the effects of waviness especially on the forced convection heat transfer around a wavy cylinder when the Reynolds and Prandtl numbers are 300 and 0.71, respectively. The present computational results for a wavy cylinder are compared with those for a smooth cylinder. The time- and total surface-averaged Nusselt number for a wavy cylinder with
is larger than that for a smooth cylinder, whereas that with
is smaller than that for a smooth cylinder. However, because the surface area exposed to heat transfer for a wavy cylinder is larger than that for a smooth cylinder, the total heat transfer rate for a wavy cylinder with different wavelengths of
is larger than that for a smooth cylinder.
Resistance Performance of Korean Small Coastal Fishing Boat in Low-Speed Range
Jee, Hyun-Woo ; Lee, Young-Gill ; Kang, Dae-Sun ; Ha, Yoon-Jin ; Choi, Young-Chan ; Yu, Jin-Won ;
Journal of the Society of Naval Architects of Korea, volume 46, issue 1, 2009, Pages 10~23
DOI : 10.3744/SNAK.2009.46.1.010
Korean small coastal fishing boats have the different kind of fisheries and customs against Japanese fishing boats. Those bring some influences on the principal parameters of hull form. In same displacement, Korean small coastal fishing boat has generally shorter length, draft and wider breadth than Japanese fishing boat. Furthermore, even though the parameters of each hull form are similar, it is known that the resistance performance of Korean small coastal fishing boat is worse than that of Japanese fishing boat. In this study, the representative hull forms of Korean and Japanese small coastal fishing boats are selected and compared to evaluate the resistance performance of Korean fishing boat in low-speed range. The hull form of the Korean fishing boat is modified as comparison with that of the Japanese fishing boat to confirm the partial characteristic differences between the hull forms and the resistance performances. The representative partial characteristics of hull form are the gradient of chine line, keel shape and stern length. The resistance performances of the modified hull forms are evaluated by INHAWAVE which is one of CFD program and model tests in towing tank. The results of the present study will be used to improve the resistance performance and to develop the practical hull form of Korean small coastal fishing boats as principal data in the preliminary hull form design of fishing boats.
Fatigue Assessment in accordance with Back Plate of Butt Welded Specimens
Do, Hyun-Duk ; Kang, Sung-Won ; Han, Ju-Ho ; Kim, Seong-Min ; Kim, Myung-Hyun ;
Journal of the Society of Naval Architects of Korea, volume 46, issue 1, 2009, Pages 24~30
DOI : 10.3744/SNAK.2009.46.1.024
The purpose of this study is to investigate the fatigue strength in accordance with back plate of butt welded specimens. Fatigue life of butt welded specimens was presented for determining the effect of back plates in terms of fatigue strength. As a results, fatigue strength of butt welded specimens with steel back plate show a decrease as compared against the butt welded specimens with ceramic back plate. Compared with the fatigue strength with respect to the existence of steel back plate, the specimens without back plate were much higher than the specimens with back plate.
A Procedure for a Strength Assessment of Permanent Means of Access Structure
Jang, Beom-Seon ; Chung, Sung-Wook ; Ko, Dae-En ; Chun, Min-Sung ; Kim, Ji-Young ;
Journal of the Society of Naval Architects of Korea, volume 46, issue 1, 2009, Pages 31~42
DOI : 10.3744/SNAK.2009.46.1.031
Common structural rule (CSR) doesn' t provide any other specific regulations for permanent means of access (PMA) platform structure in a cargo oil tank. The PMA platform is recommended to comply with scantling requirement of local support member. However, it leads to too conservative scantlings compared with actual loads imposed on the platform. This paper proposes a strength assessment procedure for the PMA structure based on a nonlinear ultimate strength. The ultimate strength is evaluated in a sufficiently conservative way. The first linear buckling mode is used as an initial imperfection shape and its magnitude is determined using the definitions of DNV PULS. Since the same imperfection mode as the failure mode of the ultimate limit state is assumed, it can accelerate the failure. Au ultimate strength capacity curve obtained from a series of nonlinear FE analysis is compared with actual stresses calculated by CSR cargo hold analysis.
Development of a Naval Ship Product Model and Management System
Oh, Dae-Kyun ; Shin, Jong-Gye ; Choi, Yang-Ryul ; Yeo, Yong-Hwan ;
Journal of the Society of Naval Architects of Korea, volume 46, issue 1, 2009, Pages 43~56
DOI : 10.3744/SNAK.2009.46.1.043
The Korean navy has made many efforts to apply the concepts of PLM (Product Lifecycle Management) and M&S to its naval design and production. However, most of the efforts that have being applied to some acquisition processes, focused only on the element technologies without information models and data frameworks. This study discusses an information model of naval ships for advanced naval acquisitions. We introduce a naval ship product model, and it refers to the DPD (Distributed Product Description) concept of SBA (Simulation-Based Acquisition). To realize the product model concept, we design a data architecture and develop a Product Model Management System (PMMS) based on a PDM System. It is validated through the case study of building the product model of the battle ship that the PMMS has the applicability to effectively manage the naval ship acquisition data on the basis of a 3D product model.
A Study of Product Information Quality Verification in Database Construction of Naval Ship Product Models
Oh, Dae-Kyun ; Shin, Jong-Gye ; Choi, Yang-Ryul ;
Journal of the Society of Naval Architects of Korea, volume 46, issue 1, 2009, Pages 57~68
DOI : 10.3744/SNAK.2009.46.1.057
In automotive industries, reusability of product information is increasing through database construction of previous product data. The product data is stored by data quality management in product information systems. For naval ships, have the functional similarity by the ships of the same classification and class, that are built by series. Information of hull structures as well as embarked equipments are similar. So it would be effective to use database systems that are considered product information quality of previous ships in design and production processes. In this paper we discuss product information quality in database construction of naval ship product models. For this, we propose a basic concept and reference model for data quality verification. Based on this concept, A verification guideline is defined and it is applied for the case study of the digital naval ship which was built to the naval ship product model.
Development of Design Technology for Safety Enhancement of Damaged Ship
Lee, Soon-Sup ; Lee, Dong-Kon ; Kim, Ki-Sup ;
Journal of the Society of Naval Architects of Korea, volume 46, issue 1, 2009, Pages 69~77
DOI : 10.3744/SNAK.2009.46.1.069
Loss of human lives and properties including environmental damage due to large scale accidents requires change of our perception to marine safety. IMO is trying to re-establish overall marine safety system through long term plan such as GBS. Along this line, current regulation based safety evaluation is in process of changing into performance based methods, and for this transition, simulation based safety evaluation during design stage considering damage is highly necessary. In this paper, first, damage scenario is developed from IMO regulations and accident case studies. Then an integrated and simulation based safety evaluation prototype system considering both damage stability and structural safety is developed for the use during ship design process.
A Simulation-Based Capacity Analysis of a Block-Assembly Process in Ship Production Planning
Song, Young-Joo ; Lee, Dong-Kun ; Choe, Sung-Won ; Woo, Jong-Hun ; Shin, Jong-Gye ;
Journal of the Society of Naval Architects of Korea, volume 46, issue 1, 2009, Pages 78~86
DOI : 10.3744/SNAK.2009.46.1.078
A capacity calculation and process analysis is a very important part for the entire ship production planning. Ship's production plan is set up with a concept that the product is produced based on the capacity achievable by the processes while general manufacturing sets up the production plan based on product lead-time. Therefore, in case the calculation of capacity for each process of shipbuilding yard is different from actual conditions, a series of production plan - ship table composition, dual schedule plan and execution schedule plan, etc - may accumulate errors, lose reliability of planning information and cause heavy cost deficit in this course. In particular, in case of new shipbuilding yard, stocks between processes are built up and half blocks are not supplied in timely manner, and that is sometimes due to the clumsiness of the operator but it is more often because of the capacity to execute each process is not logically calculated. Therefore, this paper presents the process to calculate the assembly leadtime and assembly process capacity for shipbuilding yard assembly factory. This paper calculated the block type for calculation of assembly lead time based on block DAP(detailed assembly procedure), and introduced cases that calculate production capacities by assembly surface plate by considering the surface plate occupied area of the blocks that change depending on assembly field area and assembly processes through assembly simulation.
B-spline Surface Fitting using Genetic Algorithm
Le, Tat-Hien ; Kim, Dong-Joon ; Min, Kyong-Cheol ; Pyo, Sang-Woo ;
Journal of the Society of Naval Architects of Korea, volume 46, issue 1, 2009, Pages 87~95
DOI : 10.3744/SNAK.2009.46.1.087
The applicability of optimization techniques for hull surface fitting has been important in the ship design process. In this research, the Genetic Algorithm has been used as a searching technique for solving surface fitting problem and minimizing errors between B-spline surface and the ship's offset data. The encoded design variables are the location of the vertex points and parametric values. The sufficient accuracy in surface fitting implies not only various techniques for computer-aided design, but also the future production design.