• 한국산학기술학회논문지
• /
• 제13권1호
• /
• pp.1-7
• /
• 2012

선박설계에 있어서 설계효율 향상 및 설계품질 확보를 위해서는 설계 자동화 시스템의 구축이 필수적이다. 이를 위해서는 조선전용 3차원 CAD 시스템의 개발과 함께 여러 설계 공정에서 발생되는 설계정보를 충돌 없이 자연스럽게 반영해 줄 수 있는 설계 정보 관리 소프트웨어들이 개발되어야 한다. 설계 정보 관리가 요구되는 대표적인 예로서 선체 의장품 시공에 필요한 의장 홀의 설계 과정을 들 수 있다. 설계 기간 중 빈번하게 발생하는 의장 부서로부터의 홀 시공 요구에 대하여 구조 설계 부서는 구조 안정성과 적합성을 고려하여 검토하고 반영 여부를 의장 부서로 통보하게 되며, 결정 시까지 부서간의 업무 협의, 토론, 관련 도면 작성 등 많은 설계자원이 투입된다. 본 논문에서는 이러한 의장 홀 설계 과정을 자동화하기 위한 홀 플랜 시스템의 기본 개념 소개와 함께 프로세스 자동화 방안을 제시한다.

• 선박안전
• /
• 통권23호
• /
• pp.51-64
• /
• 2007

Main concern of this subject is "hat type of hull shape is most important for building aluminum fishing vessel and suitable for domestic fisherman." For the this subject, We research from traditional hull shape of fiberglass fishing vessel and supply to our domestic fisherman with 3D render images. Following the above job making with concept design and basic drawing for product model. And most important research job with technical of aluminum vessel and products system and standard of job description. We filled two category with design and products for our domestic fisherman.

• International Journal of Naval Architecture and Ocean Engineering
• /
• 제12권1호
• /
• pp.325-342
• /
• 2020

The current study is focused on the evaluation of the ultimate strength of stiffened panels found in ship hull structures that are subjected to combined uniaxial thrust, in-plane and out-of-plane bending moments. This loading condition, which is in general ignored when performing buckling checks, applies to representative control geometries (stiffener with attached plating) as a consequence of the linearly varying normal stresses along the ship's depth induced by the hull-girder vertical bending moment. The problem is generalized by introducing a non-uniform thrust described by a displacement ratio and rotation angle and by introducing the slenderness ratios, within the practical range of interest. The formed design space is explored through methods sourcing from Design of Experiments and by applying non-linear finite element procedures. Surrogate empirical models have been constructed through regression analysis and Response Surface Methods. An additional empirical model is provided to the literature for predicting the ultimate strength under uniaxial thrust. The numerical experimentation has shown that is a significant influence on the ultimate strength of stiffened panels as the thrust non-uniformity increases.

• Journal of Ship and Ocean Technology
• /
• 제12권3호
• /
• pp.1-13
• /
• 2008

In shipbuilding, diverse manufacturing techniques for automation have been developed and used in practice. Among them, however, the hull forming automation is the one that has not been of major concern compared with others such as welding and cutting. The basis of the development of this process is to find out how to extract thermal forming information. There exist various methods to obtain such information and the 3D design shape that needs to be formed should be extracted first for getting the necessary thermal forming information. Except well-established shipyards which operate 3D design systems, most of the shipyards only rely on 2.5D design systems and do not have an easy way to obtain 3D surface design data. So in this study, various shipbuilding design systems used by shipyards are investigated and a 3D design surface data extraction method is proposed from those design systems. Then an example is presented to show the extraction of real 3D surface data using the proposed method and computation of thermal forming information using the data.

• 대한조선학회논문집
• /
• 제36권3호
• /
• pp.1-7
• /
• 1999

본 논문에서는 충주호에서 유람선으로 사용되고 있는 광폭천흘수형 선박을 대상으로 선정하고, 공기를 공급하여 선저에 공동을 형성시켜 마찰저항을 감소시킬 수 있도록 선박의 선저형상을 개량하였다. 2차원 공동문제로 이상화하여 선저에 부착되는 공동을 이론적 방법으로 수치해석하여 공기공동의 형상과 내부압력을 추정하였고 공동현상을 지배하는 무차원수를 살펴보았다. 예인수조에서 모형선실험을 시행하고 단의 높이변화, 선측의 공기유출막이벽 등에 의한 공기공동의 형성과 저항감소효과를 조사하였다. 또한 투명한 아크릴로 제작된 선저부를 통해, 선저에 부착되는 공기공동의 발달과정을 관측하였다. 이러한 연구를 통하여, 실선선형의 선저부 형상을 적절히 개량하고 공기를 공급함으로써 설계속도 부근에서 원래선형의 전저항의 25%정도를 줄일 수 있음을 모형선에서 확인하였다.

• Structural Engineering and Mechanics
• /
• 제42권4호
• /
• pp.507-530
• /
• 2012

Age-related problems especially corrosion and fatigue are normally suffered by weatherworn ships and aging offshore structures. The effect of corrosion is one of the important factors in the Common Structural Rule (CSR) guideline of the ship design based on a 20 or 25 years design life. The aim of this research is the clarification of the corrosion effect on ultimate strength of stiffened panels on various types of double hull oil tankers. In the case of ships, corrosion is a phenomenon caused by the ambient environment and it has different characteristics depending on the parts involved. Extensive research considering these characteristic have already done by previous researchers. Based on this data, the ultimate strength behavior of stiffened panels for four double hull oil tankers such as VLCC, Suezmax, Aframax, and Panamax classes are compared and analyzed. By considering hogging and sagging bending moments, the stiffened panels of the deck, inner bottom and outer bottom located far away from neutral axis of ship are assessed. The results of this paper will be useful in evaluating the ultimate strength of an oil tanker subjected to corrosion. These results will be an informative example to check the effect of ultimate strength of a stiffened panel according to corrosion addition from CSR for a given type of ship.

• 한국전산유체공학회:학술대회논문집
• /
• 한국전산유체공학회 2000년도 추계 학술대회논문집
• /
• pp.9-14
• /
• 2000

Computational methods can be classified roughly into two parts: one is the methods based on a potential flow theory, and the other is numerical solvers(CFD) based on Navier-Stockes equation. Methods based on a potential theory are more effective than CFD when the free surface effect is considered. Especially Rankine source method seems to become widespread for simulations of wave making problems. For computations of viscous flow problems, CFD techniques have rapidly been developed and have shown many successful results in the viscous flow calculation. Present paper introduces a computational system 'WAVIS' which includes a pre-processor, potential ant viscous flow solvers and a post-processor. To validate the system, the calculated results for modem commercial hull forms are compared with measurements. It is found that the results from the system are in good agreement with the experimental data, illustrating the accuracy of the numerical methods employed for WAVIS.

• 수산해양기술연구
• /
• 제38권4호
• /
• pp.289-292
• /
• 2002

TPI는 고속 활주선의 소음, 진동, 트림 및 핏칭운동을 감소시킨 것으로 실선 시운전에서 증명되었다. 또한 모형시험에서 저항성능도 미소하게나마 개선시킨 것으로 입증되었다

• Journal of Advanced Marine Engineering and Technology
• /
• 제23권4호
• /
• pp.565-573
• /
• 1999

Hihg Tensile Steel enables to reduce the plate thickness comparing to the case when Mild Steel is used. From the economical view points this is very preferable since the reduction in the hull weight. however to use the High Tensile Steel effectively the plate thickness may become thin so that the occurrence of buckling is inevitable and design allowing plate buckling may be necessary. If the inplane stiffness of the plating decreases due to buckling the flexural rigidity of the cross sect6ion of a ship's hull also decreases. This may lead to excessive deflection of the hull girder under longitudinal bending. In these cases a precise estimation of plate's behavior after buckling is necessary and nonliner analysis of isolated and stiffened plates is required for structural sys-tem analysis. In this connection this paper discusses nonlinear behaviour of thin plate under thrust. Based on the analytical method elastic large deflection analysis of isolated plate is perform and simple expression are derived to evaluated the inplane rigidity of plates subjected to uniaxial compression.

• 대한조선학회지
• /
• 제23권3호
• /
• pp.27-38
• /
• 1986

In the recent years, the finite element method has been a leading method in calculating the strength of ship hull structural members. But such a calculation has many difficulties in constructing data, reducing CPU-time and connecting it with optimal design. This paper describes more efficient method for three dimensional strength calculation of the hull structure of oil tanker by using the slope-deflection method, and the computer program based on this method is developed. The results of the calculation by using this method are compared with those by using the SAP4 program based on the finite element method. Some advantages are obtained from the application of the slop-deflection method described in this paper in the calculation of the hull structure oil tanker.