• 대한조선학회논문집
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• 제45권3호
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• pp.315-321
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• 2008

A large ship usually consists of 300 to 500 blocks, for which it is extremely difficult to monitor the whole manufacturing processes from assembly to erection. In an effort to unify all the data and procedures, shipbuilding companies are installing ERP systems, which have brought great improvement throughout the company as a whole. In some departments, however, the ERP systems are not being fully utilized. This paper analyzes and solves the problems revealed especially at the production departments after an ERP system is installed. In this research, firstly a TOC(Theory of Constraints) analysis is done to find out the best solution for those problems. Secondly, based on the solution found, a Monitoring System for hull construction processes is developed with an improved user interface. The visualization of data is designed to reflect the needs of the production departments. The new system supplements the ERP system in that it selectively utilizes the unified data base and is operated under ERP environment. The system is installed in the production departments and its usefulness is verified.

• 대한조선학회논문집
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• 제45권2호
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• pp.144-150
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• 2008

Ships and offshore structures are exposed to wave and engine excitation loadings during navigation and cargo/ballasting operations. These excessive loads may cause damages to hull and may result loss of life the ship. Therefore, it is important to develop a system that allow accurate measurements of global hull loads. The objective of the study is developing a fiber optic monitoring system that is capable of monitoring, recording and warning of the vessel performance. A method for measurement of global loads on a vessel, using strain measurements from a network of fiber optic strain sensors and extensive finite-element analyses(FEA) with idealistic load cases, is presented. The method has been successfully validated on the idealized ship structure model with strain sensors.

• International Journal of CAD/CAM
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• 제6권1호
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• pp.9-17
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• 2006

Performing inspections for Hull Condition Monitoring and Assessment as stipulated in IACS unified requirements and IMO's Condition Assessment Scheme (CAS) IMO Resolution MEPC.94(46), 2001, Condition Assessment Scheme, IMO Resolution MEPC.111(50), 2003, Amendments to regulation 13G, addition of new regulation 13H involves a huge amount of measurement data to be collected, processed, analysed and maintained. Information to be recorded consists of thickness measurements and visual assessment of coating and cracks. The amount of data and increasing requirements with respect to condition assessment demand efficient computer support. Currently, due to the lack of standardization for this kind of data, the thickness measurements are recorded manually on ship drawings or tables. In this form, handling of the measurements is tedious and error-prone and assessment is difficult. Data reporting and analysis takes a long time, leading to some repairs being performed only at the next docking of the ship or making an additional docking necessary. The recently started ED funded project CAS addresses this topic and develops-as a first step-a data model for Hull Condition Monitoring and Assessment (HCMA) based on XML-technology. The model includes simple geometry representation to facilitate a graphically supported data collection as well as an easy visualisation of the measurement results. In order to ensure compatibility with the current way of working, the content of the data model is strictly confined to the requirements of the measurement process. Appropriate data interfaces to classification software will enable rapid assessment by the classification societies, thus improving the process in terms of time and cost savings. In particular, decision-making can be done while the ship is still in the dock for maintenance.

• 한국소음진동공학회논문집
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• 제19권2호
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• pp.155-161
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• 2009

Engine builders have separately developed and applied torsional, axial and structural vibration monitoring system on most marine engines. These systems displayed their results for engine or ship operation engineers and were not regularly stored at the hardware of computer. So, the history and trend of various engine and hull vibrations were not supported for preventive maintenance and to protect the failure of these activity or function. The integrated vibration or stress monitoring system(EVAMOS : engine vibration analysis and monitoring system) in marine diesel engine, its accessories and hull structure have been developed by the dynamics laboratory of Mokpo Maritime University during last 3 years. This paper introduces the design conception and ability of commercial software EVAMOS with field data on several actual tests.

• 대한조선학회지
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• 제24권2호
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• pp.62-68
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• 1987

• 센서학회지
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• 제21권4호
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• pp.276-282
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• 2012

Vessels receive stress during their navigations as well as during their cargo operations. This stress may cause damages to the hull and may result in accidents. So the hull stress monitoring system(HSMS) is recommended in order to prevent these accidents. In this paper, we manufactured fiber Bragg grating(FBG) sensor and the model ship for towing tank experiments. The strain characteristics of the model ship on the water wave were measured through the towing tank experiment. The FBG sensors and electric strain gauges were attached on the connection jig, and then the characteristics of the FBG sensor were compared with those of the electric strain gauge. The strain of model ship was increased according to the increment of the amplitude of water wave. In particular, the largest strain was measured in the center of the model ship. As the wave period increased, the strain of model ship was decreased.

• 대한조선학회논문집
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• 제36권4호
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• pp.128-136
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• 1999

이 논문은 선체 외판 자동 생산 시스템의 효과적인 구축을 위하여 기존의 객체 지향 시스템 개발 이론을 개선한 ESBD(Evolutionary Simulation Based Design)을 제안한다. 목표 시스템인 AHMS(Automated Hull-piece Manufacturing System)는 가공 이전 평후판의 입고, 선처리, 절단, 1차 곡가공, 2차 곡가공 그리고 출고에 이르는 가상화된 자동화 공정의 분산 제어 시스템으로서 ESBD에 의해 개발된다. 실시간 원격 제품 모니터링(Product Monitoring)과 제품 정보 관리(Product Data Management)를 실현하기 위하여 분산 제어 및 물류 시뮬레이션을 통한 시스템 개발을 적용한다. 실험적으로 개발된 시스템은 새로운 공장의 배치 및 설계에 기본적인 가이드 라인을 제시하는 역할도 수행한다.

• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 2015년도 추계학술대회
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• pp.150-151
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• 2015

선박의 에너지효율을 정량화하는 것은 선박의 Performance를 분석함에 있어 매우 중요하다. 또한, 분석된 결과를 토대로 Performance를 개선할 수 있는 Factor를 찾아야 할 것이다. 이 연구에서는 선박의 선체저항을 어떻게 정량화하고 그 방법론을 연구하는 것에 목적이 있으며 실제 선박에 적용 가능한 것인지 실해역에서 운항중인 선박의 데이터를 이용하여 방법론을 검증하고자 하였다.

• Journal of Advanced Marine Engineering and Technology
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• 제35권8호
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• pp.1111-1116
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• 2011

비접지방식 선박에서의 접지 고장은 대지 임피던스의 불평형을 가져오고 대지전압을 상승시켜 감전이나 전기화재의 염려가 높아진다. 접지에 따른 이 같은 대지전압의 왜곡 상태는 전기안전의 측면에서 실시간으로 감시할 필요가 있으며 이 경우 대지전압의 측정치를 위상변화 감시가 가능한 벡터다이어그램으로 나타내는 것이 효과적이다. 대지전압의 상태는 중성점 위치에 의해 표시될 수 있다는 점에서 우선 측정된 대지전압 입력에 대해 벡터 평면의 중성점을 출력하는 연산과정과 알고리즘의 해석이 필요하다. 이를 토대로 본 연구에서는 매 샘플링 주기마다 대지전압을 입력하여 컴퓨터 모니터 상에 중성점과 벡터 대지전압을 출력하는 모듈을 구성한 후 실제 배전선로에서의 실험을 통해 제시한 장치의 적정성을 확인하였다.

• Journal of Advanced Marine Engineering and Technology
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• 제31권6호
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• pp.761-767
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• 2007

We have developed novel optical-fiber sensors based on strain-induced long-period fiber gratings for monitoring the deformation of a hull. They have no external pressure for sustaining the mechanical formed gratings. The pressure, which provides a force to form the periodic grating along the single mode fiber, was realized by the bonding strength of a photopolymer. To reduce the polarization dependency of the sensors caused by the asymmetry structure of gratings, a Faraday Rotator Mirror (FRM) was utilized in this experiment. We have realized the polarization-insensitive function of the proposed sensors. The change of an external strain are measured by an optical spectrum analyzer. When the external stain increases. the attenuation at the resonant wavelength decreases and the loss peak was slightly shifted to the shorter wavelength.