• 시스템엔지니어링학술지
• /
• 제4권2호
• /
• pp.1-13
• /
• 2008

The development of hull curved plate forming automation system in ship production field begins from the need of stakeholders such as enterprise organization, who need the reduction of cost and time and improvement of productivity, and end users who work for this production process. Even though hull curved plate forming automation system has small scale, it is reasonable to consider the system as an interdisciplinary system, because the system includes all of hardware, software, human and information and has a specified objective to be performed. In this paper, introduction of 4 leading Model-Based Systems Engineering (MBSE)methodologies is described and SysML(Systems Modeling Language), which is designed to analyze, specify, design, and verify complex systems, is introduced in order to support those methodologies. Especially, SysML is applied to system modeling of hull curved plate forming automation system and focused on. The structure diagrams and behavior diagrams based on operational context of the automation system are used to make system architecture. The performed application of SysML to the hull curved plate forming automation system shows an example of applying SysML to the development of other autonomous systems in ship production domain.

• 한국해양공학회지
• /
• 제17권1호
• /
• pp.72-79
• /
• 2003

This paper deals with the development of an interface program for automatic plate forming, which can exchange information between the heating line information generation program and the automatic heating apparatus. In this paper, the performance of the developed interface program has been verified from the view point of numerical position control. By applying the interface program to the operation of the automatic heating apparatus, an experiment of line heating has been conducted for several steel plate models. Based on the experimental results, a simplified relation to estimate angular distortion has keen derived as a natural characteristic of the present automatic heating apparatus. As a result of the present study, the prototype of the automatic plate forming system has been constructed, and its application to the real surface models found in the ship will be presented in the near future.

• Journal of Welding and Joining
• /
• 제27권2호
• /
• pp.32-37
• /
• 2009

In shipyard, plate forming is widely used to form the ship hull plate in various shapes. Line heating method by using a flame torch is one of the major shipbuilding processes carried out by skilled workers. Since the forming characteristics depend upon their experiences in manual forming, there are much variations between products and difficulties in communication between engineers and workers. Hence, it needs to develop an automatic forming system which can not only reduce the working time and rework costs but also improve the working environment and hull forming productivity. One of the final goals of plate forming automation is to form a target shape from the initial plate automatically. For automated plate forming, it is required to determine where and how to heat on the plate. To realize this procedure, the inverse problem should be first solved and the effect of curvature shape formed at the heating path should be investigated. In this study, the inverse problem was solved by geometrical approach using the relationship between bending angle and radius of curvature of the curved shape. In addition, experiments of two-dimensional plate forming were performed with the distance-based method considering the curved bending with curvature. The result of the formed shape agreed considerably well with the target shape.

• 대한조선학회논문집
• /
• 제31권4호
• /
• pp.139-146
• /
• 1994

본 논문에서는 선상가열법을 이용한 강판의 곡가공 자동화를 향한 하나의 가능성 있는 방향을 제시하고 있다. 이를 위해 선상가열현상을 대변할 수 있는 역학적 모델을 도입하여 가열조건들이 주어져 있을 때 가열경로를 구할 수 있는 알고리즘을 소개하였고 이에 의거해서 컴퓨터 프로그램을 개발하였다. 이의 정당성을 확인하기 위해 개발된 컴퓨터 프로그램을 2가지 형태의 곡면형상에 적용하여 이를 가공할 수 있는 가열경로를 찾는 시도를 해 보았는데, 이로부터 본 논문에서 제안하는 알고리즘과 프로그램 시스템은 만족할 만한 결과를 주고 있으며, 이는 곡가공 자동화 시스템 구축을 향한 합리적인 길이 될 수 있음을 확인할 수 있었다.

• 한국해양공학회:학술대회논문집
• /
• 한국해양공학회 2002년도 추계학술대회 논문집
• /
• pp.318-322
• /
• 2002

In this paper the automatic plate forming system developed by the present research group is introduced, which would be helpful for other researchers. The present system consists of three parts : heating line information generation software, automatic heating apparatus and numerical control system. The numerical control system developed by the present authors is detailed. Performance test for the developed system has been carried out and good results has been obtained. As an extension of the present study, the present automatic plate fanning system will be applied to surfaces found in ship and offshore structure.

• 대한조선학회논문집
• /
• 제33권3호
• /
• pp.81-93
• /
• 1996

이 논문에서는 강판의 곡가공과 관련해서 지금까지 수행된 연구의 동향을 검토하였고, 이의 자동화 시스템 구축에 있어서 우선적으로 선행되어야 할 부분으로서 주어진 곡면의 Marking Data를 자동으로 생성하도록 개발한 전산 시스템의 개요와 이를 실제 곡면모델에 적용한 결과를 다루었다. 본 연구에서 소개하는 Marking Data 생성을 위한 전산 시스템을 실제 곡면모델에 적용한 곁과로부터 추정한 곡면이 주어진 곡면에 상당히 접근하는 결과를 보여 주고 있으며 생성된 Marking Data 역시 현재 현장에서 시행하는 것에 부합되는 합리적인 것이였다. 따라서 여기에서 소개한 Marking Data 자동생성을 위한 전산 시스템을 추후 더 많은 곡면모델에의 적용을 통해서 보완한다면 현장에서 충분히 실용적으로 사용할 수 있을 것으로 보여진다.

• Journal of Welding and Joining
• /
• 제28권1호
• /
• pp.92-99
• /
• 2010

For the last couple of decades many studies have been carried out to find out solutions to improve the effectiveness and productivity of the plate forming process. The practical way for the automation of the plate forming process has not been, however, developed yet. Since the characteristics of heating machines may be different form each other, it is necessary to investigate the thermal deformation characteristics of the heating machine to be used in the automation system. And their characteristics may be updated as new information about thermal deformation by heating is accumulated. In this paper, data base system has been constructed based on the results of experiments and numerical analyses, which will be used in deriving the deformation estimation formula. The computer code which can automatically derive the deformation estimation formula has been also developed. This paper also illustrates how the formula is updated as experimental data are added. From the present findings, it can be said that the automatic deriving procedure may be important in the automated plate forming system since the heating line information to be generated must be directly influenced by the deformation estimation formula.

• 대한조선학회논문집
• /
• 제56권2호
• /
• pp.128-134
• /
• 2019

In shipbuilding, accurate fabrication of curved hull plates is one of the most important steps, since the shape of ship hull, which is very critical in the overall performance of a ship, is a collection of such plates. The curved hull plates forming process requires a significant amount of time by skilled workers in shipbuilding. In general, the workers cause thermal distortion in the plate and forming initial shape using gas heat source. So shipbuilding companies need skilled workers who have long experience. To solve the problem, a lot of researchers tried to develop automation system for curved hull plates. In this paper, we propose automatic heating system with gantry robot, high frequency induction heater to replace the gas heat source and automatic measurement system. We apply the system to forming concave type plate that is actually used in ship manufacturing. In addition, a system was developed to automatically generate heating information, such as the heating location and the heating speed, for actual heating process. Then the system was applied to the actual heating material. It is shown that the proposed triangle heating pattern makes desired concave shape successfully. The induction heating system showed that it can be used for automation system of curved hull plates forming process replacing gas heat source.

• 대한조선학회논문집
• /
• 제34권2호
• /
• pp.85-89
• /
• 1997

주어진 곡면에 대한 Marking Data의 자동생성 알고리즘과 이에 의거한 전산 시스템의 개발은 강판의 곡가공 자동화 시스템 구축에 있어서 우선적으로 선행되어야 할 연구로서, 이 논문에서는 실제 곡면모델을 대상으로 기 개발한 전산시스템이 생성하는 Marking Data에 의거하여 실험을 수행함으로써 Marking Data의 자동생성을 위한 알고리즘과 개발된 전산시스템의 정당성을 확인하는 것에 중점을 주었다. 실제 곡면모텔에 대한 실험은 기 개발한 전산시스템의 결과 즉 Marking Data와 가열선에 대한 가열조건에 따라 현장에서 수행하였으며 그 결과를 Marking Data 생성 전산 시스템의 결과와의 비교를 통해 개발한 Marking Data 생성 전산 시스템의 현장에서 실용적 적용 가능성을 확인할 수 있었다. 끝으로 개발한 전산시스템의 보완과 확장에 대해 기술하였다.

• 한국해양공학회지
• /
• 제22권6호
• /
• pp.83-87
• /
• 2008

Although a great deal of research has been carried out to solve the plate forming problem and to improve the effectiveness and productivity of the plate forming process, no practical way of automating the plate forming process has been proposed yet. Since characteristics of heating machines may vary, it is necessary to investigate the thermal deformation characteristics of the heating machine that will be used in the automation system its characteristics may be modified as new information about thermal deformation by heating becomes available. In this paper, experiments for line heating have been carried out to calculate the formula of predicting thermal deformation due to line heating with varying affecting parameters, and numerical study has been carried out to produce data beyond the range where a line heating test is impractical. Formulas of predicting transverse distortion and shrinkage have been proposed and derived, based on the present experimental and numerical works. This paper also illustrates how the formula has been modified as new experimental data are added.