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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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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 52, Issue 6 - Dec 2015
Volume 52, Issue 5 - Oct 2015
Volume 52, Issue 4 - Aug 2015
Volume 52, Issue 3 - Jun 2015
Volume 52, Issue 2 - Apr 2015
Volume 52, Issue 1 - Feb 2015
Selecting the target year
An Optimization of Process Planning around Quays based on the Yard Customized GIS and the Simulator
Ruy, Won-Sun ; Hwang, Ho-Jin ; Park, Chang-Kyu ;
Journal of the Society of Naval Architects of Korea, volume 52, issue 2, 2015, Pages 97~103
DOI : 10.3744/SNAK.2015.52.2.97
This paper has focused on the middle term process planning around quays based on the prefixed long-term plan of the product mixed ships. Recently, the order rate of high add-value ships in domestic shipyards has been sharply increased and the spending time at quays is accordingly on an increasing trend. For proper and practical process planning related to quays, it has to be closely connected with a long-term plan and product calendar, erection network and result of ship allocation around quays. Moreover, it is also required to include the integrated consideration of the whole process of a yard, each ship, and each team respectively. The most distinguishing feature of this study is that it would run on the ship allocation simulator and GIS framework in order not to be limited to the specific one yard and the readers can figure out the optimization formulation containing the work load leveling and a different approach from PERT/CPM. The proposed approach reflected all requirements from the department of process planning and management in a shipyard, and the analysis of the results has explained its performance of the optimization result with the examples of total 43 ships under construction from 2008 to 2013.
A Study on the Improvement of Measuring Method for Density of Model Ice
Ha, Jung-Seok ; Kang, Kuk-Jin ; Cho, Seong-Rak ; Jeong, Seong-Yeob ; Lee, Chun-Ju ;
Journal of the Society of Naval Architects of Korea, volume 52, issue 2, 2015, Pages 104~109
DOI : 10.3744/SNAK.2015.52.2.104
The Korea Research Institute of Ships & Ocean Engineering (KRISO) has an ice tank to make a test environment similar to the real ice in the polar sea in order to carry out model tests. One of the most important task of the ice tank is to generate the model ice to have similar material properties as sea ice. The primary properties of sea ice which influence the ice performance of ice breakers and ice-strengthened vessels traveling in the polar sea are ice thickness, flexural strength, density, modulus of elasticity and crystal structure etc. Among them, since the density of model ice influences the buoyance resistance of ice for the ship model, the accurate measurement of ice density should be used to obtain the accurate analysis results from the model test. In this paper, some existing methods to measure the density of model ice are reviewed and a new one is proposed to measure it accurately and easily as possible. In this study, the measuring system including an UTM and several measuring devices was established to obtain the model ice density. Polyethylene and ice specimens are used for a series of repeatable measurement tests. From the results, it was recognized that both of the displacement method and the weight/weight methods gave the stable and favorable tendency.
Comparative Results of Weather Routing Simulation
Yoo, Yunja ; Choi, Hyeong-Rae ; Lee, Jeong-Youl ;
Journal of the Society of Naval Architects of Korea, volume 52, issue 2, 2015, Pages 110~118
DOI : 10.3744/SNAK.2015.52.2.110
Weather routing method is one of the best practices of SEEMP (Ship Energy Efficiency Management Plan) for fuel-efficient operation of ship. KR is carrying out a basic research for development of the weather routing algorithm and making a monitoring system by FOC (Fuel Oil Consumption) analysis compared to the reference, which is the great circle route. The added resistances applied global sea/weather data can be calculated using ship data, and the results can be corrected to ship motions. The global sea/weather data such as significant wave height, ocean current and wind data can be used to calculate the added resistances. The reference route in a usual navigation is the great circle route, which is the shortest distance route. The global sea/weather data can be divided into grids, and the nearest grid data from a ship's position can be used to apply a ocean going vessel's sea conditions. Powell method is used as an optimized routing technique to minimize FOC considered sea/weather conditions, and FOC result can be compared with the great circle route result.
Verification of Equipment Number Equation Considering New Types of Ships
Ku, Namkug ; Ha, Sol ; Lee, Kyu-Yeul ; Yang, Jin-Hyeck ; Bae, Jae-Ryu ; Lee, Soo-Ho ;
Journal of the Society of Naval Architects of Korea, volume 52, issue 2, 2015, Pages 119~124
DOI : 10.3744/SNAK.2015.52.2.119
The purpose of this research is a verification of the current equation for calculating equipment number and a suggesting a method for development of a rational new equation. The equation for calculating equipment number consists of total surface area of a ship that fluid resistance act on. Equipment number determines the specification of anchoring and mooring equipment such as anchor weight, anchor chains length and diameter, the number, length and breaking load of tow lines and mooring lines. The equation for equipment number calculation is basically derived considering x, y components of a wind and current force acting on a ship. But this equation is only based on a tanker, which was main type of ships when the equation was derived. Therefore, verification of the equation is required for other types of ships, such as container carrier, LNG carrier, etc. Therefore, in this research, we find out the equation for equipment number calculation should be revised for other types of ships especially the container carrier, by comparing wind and current force acting on a ship to holding force of an anchor and anchor chains, which are selected based on the equipment number.
A Study on Simplified Analysis for the Initial Tank Design of Spherical Type LNG Carriers
Shin, Sang-Hoon ;
Journal of the Society of Naval Architects of Korea, volume 52, issue 2, 2015, Pages 125~134
DOI : 10.3744/SNAK.2015.52.2.125
Spherical type LNG carrier has many advantages, but has a demerit it is more expensive than membrane type one. Therefore, when calculating the initial estimate of spherical type LNG carrier, high accuracy calculation of tank weight has to be carried out. In this study the simplified analysis method which is able to calculate stresses of all the tank zones is established and has special feature to deal with static and dynamic loading. In order to verify the established method, the design results obtained through the method in this study have been compared with those of existing ship obtained from finite element analysis. As a result, the usability of simplified analysis method has been confirmed.
Experimental Study on the Period Control of an U-tube Type Anti-Rolling Tank by using a Double Layer Duct
Ju, Youngkwang ; Kim, Yong Jig ; Ha, Youngrok ;
Journal of the Society of Naval Architects of Korea, volume 52, issue 2, 2015, Pages 135~142
DOI : 10.3744/SNAK.2015.52.2.135
The Anti-Rolling Tank(ART) has an advantage over the other roll stabilizing devices, when ship is staying and working at one site of sea. An important design point of ART is the tank tuning, that is, matching the tank natural period to the ship's roll natural period. Since the load condition and consequently the roll natural period of ship is to be changed widely, the natural period of ART also has to be changed widely. In case of the existing U-tube type ART with a single layer duct, the tank natural period can be changed in a relatively narrow range. This paper suggests a new U-tube type ART system using a double layer duct to enable wide change of ART natural period. Through the roll experiments performed in regular beam waves for a box-type model ship, it is shown that the double layer duct ART has about two times wider period range and a better reducing effect of roll magnitude than the single layer duct ART.
A Study on the Evaluation of Fiber and Matrix Failures for Laminated Composites using Hashin·Puck Failure Criteria
Lee, Chi-Seung ; Lee, Jae-Myung ;
Journal of the Society of Naval Architects of Korea, volume 52, issue 2, 2015, Pages 143~152
DOI : 10.3744/SNAK.2015.52.2.143
In the present study, the fiber and matrix failure of composite laminates under arbitrary biaxial stresses were evaluated based on separate mode criteria such as Hasnin and Puck theories. There is a limitation to predict the fiber-dominant and/or matrix-dominant failures under arbitrary stress states using limit criteria (maximum stress and maximum strain theories) and interactive criteria (Tsai-Hill and Tsai-Wu theories). There is little literature for failure analysis of ships and offshore composite structures considering advanced failure theories such as Hashin and Puck theories. Furthermore, there is not enough practical commercial finite element analysis (FEA) code which is basically adopted the separate mode criteria. Hence, in the present study, the user-defined subroutine of commercial FEA code ABAQUS for evaluation of fiber and matrix failures of composite structures was developed based on Hashin and Puck failure criteria. And then, the proposed subroutine was validated by comparing with a series of experimental results of carbon- and glass-implemented composite laminates to guarantee the reliability and usefulness of the developed method.
Serviceability Assessment of Corroded Subsea Crude Oil Pipelines
Cui, Yushi ; Kim, Dong Woo ; Seo, Jung Kwan ; Ha, Yeon Chul ; Kim, Bong Ju ; Paik, Jeom Kee ;
Journal of the Society of Naval Architects of Korea, volume 52, issue 2, 2015, Pages 153~160
DOI : 10.3744/SNAK.2015.52.2.153
Pipelines are one of the most important structures in subsea equipment. It is the main equipment for transportation of crude oil and natural gas to the downstream facilities. Crude oil and natural gas leak will be carry out not only political and financial issues but also pollution to the environment. Inaccurate predictions of corrosion behavior will make hazardous consequences. The serviceability assessment of corroded structures is essential especially for subsea pipelines. As corrosion is concerned, the effects of failure due to significant reduction will make it hard to the pipeline operator to maintain the serviceability of pipelines. In this paper, the serviceability assessment of corroded crude oil pipeline is performed using the industry design code (Shell92, DNV RP F101, ASME B31G, BS 7910, PCORRC) and FEA depending on corrosion area. In last step, the future integrity of the subsea crude oil pipeline is assessed to predict the remaining year in service of crude oil pipelines.
Redundancy Analysis of Stiffened Panel with Plastic Deformation due to Collision
Yeom, Cheol Wung ; Nho, In Sik ;
Journal of the Society of Naval Architects of Korea, volume 52, issue 2, 2015, Pages 161~169
DOI : 10.3744/SNAK.2015.52.2.161
According to SOLAS Regulation XII/6.5.3 and IMO GBS functional requirement(IMO, 2010), the structural redundancy of multi-bay stiffened panel in cargo area of bulk carrier should be provided enough in order to endure the initial design load though one bay of the stiffened panel is damaged due to plastic deformation or fatigue crack. To satisfy structural redundancy, Harmonized Common Structural Rules (hereinafter CSR-H, IACS, 2014) proposed to use 1.15 instead of 1.0 for buckling usage factor of stiffened panel in cargo area. This paper shows that buckling usage factor in CSR-H for structural redundancy is somewhat conservative considering the ultimate strength calculated by using nonlinear FEA for the damaged condition which is only one bay's plastic deformation due to colliding by weigh object like a bucket. Also, this paper presents that increasing of plate thickness only is more effective to get enough structural redundancy.