This study explores the application of numerical analysis and material models to predict ice impact loads on ships offshore structures operating in polar regions. An explicit finite element (FEA) approach was employed simulate an steel plate collision experiment conducted a cold chamber. The pressure strain history during were calculated compared with experimental results. Various model configurations applied FEA account for versatile behavior (whether ductile or brittle), its...

In this paper, the procedure for strength evaluation of piping system installed on liquefied natural gas (LNG) carriers is discussed. A that accounts ship’s wave load and hull motion acceleration (as well as deformation due to thermal expansion contraction experienced by during seafaring operations) presented. The temperature self-weight deck also considered. Various operating conditions LNG are analyzed. Stress analysis performed combining various sustained, occasional, loads. assessed...

In order to utilize wave energy, various power systems are being actively researched and developed interest in them is increasing. To maximize the operational efficiency, it very important monitor maintain fault of components system. recent years, management cost, high reliability facility utilization such has increased. this regard, diagnosis technology including factor analysis reproduction drawing attention as an main technology. Therefore, study, reproduce faults a system, firstly,...

This study introduced an experimental setup designed to predict collision pressure exerted on a structure due ice impacts. The primary aim was forecast the distribution and structural behavior following laboratory scale. apparatus comprises double-pendulum system situated within cold chamber, facilitating prediction of forces by varying both energy velocity. Experiments were conducted at velocities 5, 7, 10 knots, representative conditions in Arctic regions. By altering these velocities, we...

It is important to assess and improve the warship survivability for weapon threats which have a critical effect on warship. The of defined as capability avoid or withstand man-made hostile environment. consists three categories (Susceptibility, Vulnerability Recoverability). Firstly, susceptibility inability radars, guns, missiles etc. Secondly, vulnerability Finally, recoverability ability recover damaged components systems. Among them, this paper has described assessment hypothetical...

This study presents a method for the rapid and accurate generation of two-dimensional (2D) orthomosaic maps using selected image data collected by drone-captured video. The focus is on developing real-time capable creating more quickly than selection. scale-invariant feature transform (SIFT) algorithm applied to drone images extract features in various scale regions. For point matching, matching based fast library approximate nearest neighbors (FLANN) was adopted. A comparison computational...

Sloshing flows of liquid natural gas (LNG) with multi-phase flow characteristics consisting liquids and gases can affect the load conditions structural response cargo containment systems (CCS). The compressible properties sloshing limit maximum pressure, so a fluid model is required to represent physics. In this study, we identified suitable numerical simulate strength evaluation based on inhomogeneous model. computational dynamics (CFD) Eulerian domain model, which in turn constant volume...

Fillet welding is widely used in the assembly of ships and offshore structures. The T-joint configuration frequently reported to experience fatigue damage when a marine structure meets extreme loads such as storm loads. Fatigue affected by magnitude residual stresses on weld. Recently, many shipping registers design guides have required that strength assessment procedure seagoing structures under wave-induced random loading be compensated based effect stresses. We propose computational...

This study presents a simulation procedure for the wear of metallic materials exposed to long-term cumulative contact forces and introduces numerical analysis using discrete element method (DEM) predict damage. Since DEM can calculate motion load each particle interaction between particles dynamic collision particles, it was possible analyze causing metal wear. A reflect size, material properties, friction distance required by proposed so that be predicted practically. Considering feature...

본 논문은 슬로싱 상태에 놓인 포화 상태 액체수소탱크에서 열 유속 및 BOG(Boil-off gas)의 경향을 다루고 있다. 특히, 액체-기체 간의 침투 혼합에 의한 교환에 관심을 두었다. 먼저, VOF(Volume of fluid)와 Eulerian 기반의 다상 유동모델로 모형 실험을 모사하여 압력을 예측하고 계측된 값과 비교하였다. 자유 수면 충격 압력 실험 결과와 해석 결과를 비교하였으며, 유체의 속도 예측에서 정확할 수 있음을 간접적으로 증명하였다. 그리고 2차원의 Type-C 원통형 수소탱크를 대상으로 다상열유동해석을 수행하였다. 이때 포화상태에 액체 기체수소를 가정하고, 해석을 통해 각 상간의 교환의 수준을 확인하고자 하였다. 단, 교환만을 관심으로 두고 있었으므로 질량전달 기화모델은 해석에서 제외하였다. 최종적으로 상의 혼합으로 인해 액체수소로 유입되는 유속의 기여도에 대하여 정리하였다. 또한 유속과 집중 질량 간이식을 BOG 발생량 분석하였다.

This article introduces a mechanical forming technique using set of multipoint press (MPF) steps to obtain curved hull plate. Given only the geometry desired surface, integrated MPF system can generate punch strokes required by various geometries surfaces without need for solid dies. The divisional MPF-forming form double-curvature since discrete die surface is constructed changing double-sided reconfigurable multiple presses. spring-back phenomena after unloading be successfully compensated...

Plant equipment are designed to operate in condition of minimized failures during its service life. Because the uncertainties involved operating process, monitoring and maintenance very important avoid catastrophic failure This research gives a diagnosis system for main oil-plant industry designing pattern recognition classification scheme based on machine learning approach. The sensor data was used analysis after eliminating unwanted noise which may cause errors through preprocessing. In...

With the Fourth Industrial Revolution unfolding worldwide, technologies including Internet of Things, sensors, and artificial intelligence are undergoing rapid development. These technological advancements have played a significant role in dramatic growth predictive maintenance market for mechanical equipment, prompting active research on noise removal techniques classification algorithms accurate determination causes equipment failure. In this study, time series data were preprocessed using...

As a forming method for curved hull plates more efficient than the flame bending, mechanical bending using multi point press and die-less is discussed in this paper. flexible manufacturing system automatically of parts. It especially suited to varied This paper discusses multiple pressing machine composed pair reconfigurable punches order achieve rapid division presents how information obtained from given design surface. Although can be metal forming, spring back after phenomenon which must...

This study explores the application of numerical analysis and material models to predict ice impact loads on ships offshore structures operating in polar regions. An explicit finite element (FEA) approach was employed simulate an steel plate collision experiment conducted a cold chamber. The pressure strain history during were calculated compared with experimental results. Various model configurations applied FEA account for versatile behavior ice—whether ductile or brittle—its...

In large systems, such as power plants or petrochemical plants, various equipment (e.g., compressors, pumps, turbines, etc.) are typically deployed. Each piece of operates under generally harsh operating conditions, depending on its purpose, and with a probability failure. Therefore, several sensors attached to monitor the status each observe conditions; however, there many limitations in monitoring using thresholds maximum minimum values data. this study introduces technology that can...

구명정의 열전달 특성 및 해상상태에 따른 조난자의 저체온증 발생 가능성에 대한 기술적 검토는 선박의 좌초 침몰 사고에 대응하기 위해 활용될 수 있다. 본 연구는 해상용 구명정(또는 구명벌)의 설계에 필요한 단열 성능을 분석 평가방법에 대해서 연구하였다. 또한, 해상 가능성을 파악하기 위한 연구로써 Thermal manikin과 인체를 대상으로 체온 저하의 예측을 판단하기 단열성능 실험 인체 온도 해석 결과를 제시하였다. 해석은 구명 뗏목의 열전도 특성, 해수의 대류 효과 재료의 특성에 성능 변화를 파악하도록 유한요소해석 방법을 적용하였다. 시험에서 입수 시 신체 위해서 각 부위에 열전대를 부착한 상태로 구명정에 탑승하여 변화 열유속 계측하였다. 실험으로부터 계측한 변화와 모델의 비교함으로써 결과의 타당성을 나아가 유한요소해석을 통해 검토하였다. The technology review about risk of hypothermia victim according to heat...