• 한국CDE학회논문집
• /
• 제21권3호
• /
• pp.334-340
• /
• 2016

As Information Technology (IT) is developed constantly, big data is becoming important in various industries, including ship and offshore industry where a lot of data are being generated. However, it is difficult to apply big data to ship and offshore industry because there is no generalized platform for its application. Therefore, this study presents a big data platform based on the Hadoop for applications in ship and offshore industry. The Hadoop is one of the most popular big data technologies. The presented platform includes existing data of shipyard and is possible to manage and process the data. To check the applicability of the platform, it is applied to estimate the weight of offshore plant topsides. The result shows that the platform can be one of alternatives to use effectively big data in ship and offshore industry.

• 수산해양교육연구
• /
• 제26권3호
• /
• pp.498-509
• /
• 2014

Offshore plants is an intensive industry where real value is able to be created when EPCIC(Engineering, Procurement, Construction, Installation, Commissioning) is combined. Many universities and educational institutions have established major fields and graduate schools related in offshore construction and engineering as well as safety training and occupational courses. Most of the personnel who have graduated and passed those educational institutions have been working in domestic shipbuilding companies and marine equipment manufacturers. Therefore, customized education and training should be developed according to the educational demands required and then skilled personnel are needed to be supplied at proper times. This study, therefore, has found personnel demands inside and outside the country and occupational sections of offshore plants. Consequently, this study suggests making up a council comprised of shipbuilding companies, marine equipment manufacturers and educational institutions with government organization, and also researches the necessity of getting a job of personnel trained by the customized education. These results are expected to contribute to the development of education curriculum of domestic offshore plant as well as ODC(Offshore Development Center).

• 한국해양공학회지
• /
• 제28권2호
• /
• pp.152-159
• /
• 2014

KRISO(Korea Research Institute of Ships & Ocean Engineering) designed and manufactured a pilot mining robot called "MineRo" in 2012. MineRo is composed of four track modules. In general, much time and money are needed for deep-sea tests. Therefore, a numerical analysis to predict the dynamic behaviors has to be performed before a deep-sea test. In the numerical analysis, the information about the mining robot and soil properties are the most important factors to analyze the driving performance and dynamic response of MineRo. A terra-mechanics model of extremely cohesive soft soil is implemented in the form of the relationships between the normal pressure and sinkage, and between the shear stress and shear displacement. It is possible to acquire information about MineRo from the CAD model in the design phase. The Wong model is applied to the terra-mechanics model. This model is necessary to acquire many soil coefficients for a numerical analysis. However, in soil testing, the amount of soil property data obtained is limited. Moreover, it is difficult to analyze all of the cases for the many soil coefficients. In this paper, the dynamic behaviors of MineRo are analyzed according to the driving velocity, steering ratio, and variable extremely cohesive soft soil properties using a table of orthogonal arrays. The dynamic responses of MineRo are the turning radius, sinkage, and slip ratio. The relationships between the dynamic responses and variable soil properties are derived for MineRo.

• 한국산학기술학회논문지
• /
• 제21권11호
• /
• pp.19-27
• /
• 2020

해양플랜트 탑사이드에는 원유, 가스 등의 에너지 자원을 처리하기 위한 다양한 종류의 해양 설비들과 이들 설비들을 연결하는 기자재 및 의장재들이 제한된 공간 내에 설치되어 있다. 그리고 해양플랜트 상부구조는 해양 설비 및 관련 장비들을 고정하고 지지하기 위한 수많은 받침선반 구조물과 보강재들로 구성된 구조물이다. 본 논문은 이들 상부구조설계를 효율적으로 지원하기 위한 설계 지원 소프트웨어 개발 내용을 기술하였다. 개발된 설계 지원 소프트웨어는 AVEVA Marine의 PML(Programmable macro language)을 기반으로 하며, 상부구조설계를 위한 파라메트릭 방법을 지원한다. 브라켓, 수직 보강재 등 해양플랜트 상부 구조의 보강재를 위한 파라메트릭 설계는 설계 오류를 줄이고 효율적인 작업을 가능하게 한다. 그리고 AutoLisp을 사용하여 기본 설계와 상세설계에서 작성된 받침선반 구조에 대한 2D도면으로부터 일괄 3D 모델링하는 방법을 개발하였다. 또한, 개발된 설계지원 소프트웨어를 해양플랜트 상부구조설계 3D 모델링에 적용할 할 경우 AVEVA PDMS의 기본 기능들만 사용한 경우 대비 약 90%이상 설계시수 단축을 기대할 수 있음을 상부구조 모듈설계 적용 예를 통해 확인하였다.

• 한국해양환경ㆍ에너지학회지
• /
• 제18권2호
• /
• pp.123-132
• /
• 2015

본 연구에서는 10 MW급 부유식 파력-해상풍력 연계형 발전시스템에 설치되는 다수 풍력발전기의 배치 설계를 수행하고, 전산유체역학 해석기법을 통해 다수 풍력발전기의 성능을 평가하였다. 날개요소운동량이론을 기반으로 한 풍력발전 단지 설계용 프로그램 WindPRO를 이용하여, 발전시스템의 적지 환경 풍황조건에 대해 최대에너지를 생산할 수 있는 배치 설계를 도출하였고, ANSYS CFX를 이용하여 다수 풍력발전기간의 후류 간섭영향을 발전기 성능 측면에서 검토하여, 근거리 다수 풍력발전기간의 후류 간섭이 시스템에 미치는 영향을 평가하였다.

• 한국해양공학회지
• /
• 제30권1호
• /
• pp.10-17
• /
• 2016

This paper reports a simulation-based design method for the optimized arrangement design of buoyancy modules in a marine riser system. A buoyancy module is used for the safe operation and structural stability of the riser. Engineers design buoyancy modules based on experience and experimental data. However, they are difficult to design because of the difficulty of conducting real sea experiments and quantifying the data. Therefore, a simulation-based design method is needed to tackle this problem. In this study, we developed a simulation-based design algorithm using a multi-body dynamic simulation and genetic algorithm to perform optimization arrangement design of a buoyancy module. The design results are discussed in this paper.

• 한국해양공학회지
• /
• 제28권5호
• /
• pp.378-386
• /
• 2014

In this study, the characteristics of the current and wind forces acting on two floating bodies were numerically investigated using a commercial CFD software, STAR-CCM+. In the numerical analyses, LNGC was located right behind FSRU under uniform current or wind conditions. Steady calculations were carried out using a Reynolds averaged Navier-Stokes (RANS) solver and the realized k-epsilon model. First, the current coefficients of FSRU based only the CFD were compared with the model test data. Through this comparison, the present numerical models and mesh systems were indirectly verified. Next, computations for FSRU and LNGC in a uniform current were performed using different relative positions. It was found that the current coefficients were great affected by the longitudinal positions. Finally, the wind forces acting on FSRU and LNGC in tandem configurations were studied. The focus was on the shielding effects due to the aerodynamic interactions between FSRU and LNGC.

• Smart Structures and Systems
• /
• 제15권2호
• /
• pp.315-334
• /
• 2015

A main goal of this study is to propose a damage detection technique to detect and localize damages of a top-tensioned riser. In this paper, the top-tensioned finite element (FE) model is considered as an analytical model of the riser, and a vibration-based damage detection method is proposed. The present method consists of a FE model updating and damage index method. In order to accomplish the goal of this study, first, a sensitivity-based FE model updating method using natural frequencies and zero frequencies is introduced. Second, natural frequencies and zero frequencies of the axial mode on the top-tensioned riser are estimated by eigenvalue analysis. Finally, the locations and severities of the damages are estimated from the damage index method. Three numerical examples are considered to verify the performance of the proposed method.

• Journal of Advanced Research in Ocean Engineering
• /
• 제1권2호
• /
• pp.134-147
• /
• 2015

This study proposes a method to determine the effective angular velocity of each motor of a specific four-rows tracked vehicle (FRTV) in order to follow a given turning radius. The configuration of the four-rows tracked vehicle is introduced, and its dynamics analysis model is built using the DAFUL commercial software. The soil has been assumed to be hard ground, and the friction force between the ground and the tracked links is calculated using the Coulomb friction model. This paper uses a simulation to show that the error in the position increased with respect to the angle of the curvatures, so a method is proposed to compensate for the error in the motion of the motors. Various simulations are then carried out to verify the proposed formulation. The effects of the soil characteristics and the driving velocity will be further investigated in future studies.

• Journal of Advanced Research in Ocean Engineering
• /
• 제1권3호
• /
• pp.168-175
• /
• 2015

This study consists of an experimental investigation of the reduction of the second-order roll motion of a semi-submersible platform in head sea conditions by adding hull damping. The second-order heave drift force and roll drift moment are known to be the main triggers that induce the list angle (Hong et al., 2010). Hong et al. (2013) used numerical calculations to show the possibility of reducing the list angle by changing the pontoon shape and adding a damping device on the hull. One of their findings was that the reduction in the list angle due to the increase in pontoon surface damping was significant. A series of model tests were carried out with a 1:50 scaled model of semi-submersible at the KRISO wave basin. The experiments indicated that adding damping on the hull surface effectively suppressed the list angle.