The objective of the study is to understand effect martensite-austenite (MA) constituents along with neighbouring bainitic matrix and its on low-temperature impact toughness in thermo-mechanically simulated inter-critically reheated coarse-grained heat-affected zone (ICCGHAZ) offshore High Strength Low Alloy (HSLA) steels. ICCGHAZ was using a Gleeble 3500 thermomechanical simulator between inter-critical temperature near Ac1 (lower ICT) at 50 °C higher (upper for two different steels (steel...

Recently, a number of wind turbines are being installed due to the increase interest in green energy. Such on land or offshore, and most them because easy installation. However, it is possible get better quality request for an offshore turbine increasing some heavy industries including shipyards producing different sizes turbines. A floating crane used constructing its weight amounts several hundred tons. Thus, very important secure safety during construction. In this study, dynamic response...

This paper presents a tagline proportional–derivative control method for suppressing the swing motion of heavy load suspended by floating crane in an ocean environment. The mechanism, which is connected between and load, applied to crane. winch, mounted on deck crane, used tension tagline. A algorithm generate force winch. Swing angle feedback supplied encoder attached at boom tip To demonstrate performance method, numerical simulations are performed non-linear six-dimensional mathematical...

The liquefaction process is regarded as primary among all topside systems in liquefied natural gas floating, production, storage, and offloading (LNG FPSO) applications. process, which typically accounts for 70% of the capital cost 30 to 40% overall LNG FPSO plants, condenses separated pretreated into LNG. volume liquid occupies about 1/600 gas. cycles use seven main types equipment: compressor, seawater cooler, expansion valve, heat exchanger, phase separator, tee, common header. Different...

Abstract The present study describes the development of control hardware and software for a mobile welding robot. This robot is able to move perform tasks in double hull structure. consists main controller machine controller. Control four layers. Each layer modules. Suitable combinations modules enable required tasks. developed using C programming under QNX operating system. For modularizing architecture software, we designed with layers: Task Manager, Planner, Actions Task, Executer....

To evaluate the time-domain positioning performance of arctic marine structures, it is necessary to generate an ice load appropriate for current position and heading structure. The orientation angle a floating body continuously change with time. Therefore, required any attitude in simulation. In this study, we present fundamental technique analyzing loads frequency domain based on data measured at various angles ice-water tank experiment. We perform spectral analysis instead general FFT...

Constraints related to offshore projects such as liquefied natural gas floating, production, storage, and offloading (LNG-FPSO) have been considered more important than those in onshore areas because topside process systems are located on the limited hull space. Therefore, layout of LNG-FPSO equipment shall be designed multi-deck instead single-deck, this optimised order reduce area occupied by at front-end engineering design stage. In study, an optimal module for a generic LNG liquefaction...

This study addresses challenges in ship arrangement design by proposing an automated pipe routing method unit modules. Currently, designers rely on experience, lacking quantitative assessments and causing difficulties for non-experts. The proposed incorporates expert knowledge rules into system, evaluating expertise adherence to rules. system’s evaluation result was used as the objective function of optimization problem formulated conjunction with metrics such total length, number bends,...

As marine resources have been actively explored, a large number of offshore drilling platforms such as drillships and semi-submersible rigs built in many shipyards. The system is the key feature that defines characteristics platform. operation usually focused on tubular handling, hoisting, rotating systems which are directly handling pipes risers drill floor. Therefore, most training simulators developed only for controlling equipment. However, not equipment floor, but also compensations...

In this paper, a dynamic response analysis of floating offshore wind turbine is performed during the rotor rotation under and wave loads after was installed on platform.The modelled as system that consists platform, tower, nacelle, hub, three blades. Flexible multibody dynamics employed in constructing equations dealing with motion for analysis. The tower blades are constructed flexible bodies by using three-dimensional beam element. external forces acting platform included hydrostatic...

A layout of an LNG FPSO should be elaborately determined as compared with that onshore plant because many topside process systems are installed on the limited area; deck FPSO. Especially, made multi-deck, not single-deck and have a minimum area. In this study, multi-floor for liquefaction process, dual mixed refrigerant(DMR) cycle, was by using optimization technique. For this, problem mathematically formulated. The consists 589 design variables representing positions systems, 125 equality...

This paper presents a simulation for passenger ship evacuation considering the inclination of ship. In order to describe passenger's behavior in an situation, is modeled as rigid body which translates horizontal plane and rotates along vertical axis. The position rotation angle are calculated by solving dynamic equations motions at each time step. To calculate inclined damaged ship, static equilibrium derived using "added weight method". Using these equations, physical external forces due...

Contemporary lectures in undergraduate engineering courses typically focus on teaching major technical knowledge-based theories a limited time. Therefore, most do not allow the students to gain understanding of how are applied, especially Naval Architecture and Ocean Engineering departments. Shipyards require acquire practical ship design skills courses. To meet this requirement, two organized by authors; namely, “Planning Procedure & Engineering” (PNAOE) “Innovative Ship Design” (ISD). The...

본 연구에서는 선체 블록의 운반 작업 중 발생하는 동적 하중 및 골리앗 크레인의 와이어 로프(wire rope)와 블록간의 접촉력을 고려한 최적 러그 배치 시스템을 설계하고, 다물체계 동역학 커널과 외력 계산 커널을 개발하였다. 커널은 recursive formulation을 이용하여 운동 방정식을 구성하였고, 비선형 유체 정역학적 힘, 선형 동역학적 풍력, 계류력을 계산할 수 있다. 개발된 커널의 효용성을 검증하기 위해, 이를 로프와 간섭과 이때 작용하는 계산하였고, 마지막으로 결과를 반영하여 러그가 부착된 블록에 대한 구조 해석을 수행하였다. In this study, dynamic load and contact force between a building block wire ropes of goliath crane are calculated during lifting or turn-over for the design an optimal lug arrangement...