기름 및 해수 노출에 따른 오일펜스 본체부 인장강도 변화

장판길(Pankil Jang),이희진(Heejin Lee),서정목(JeongMog Seo) 한국해양환경·에너지학회 2021 한국해양환경·에너지학회 학술대회논문집 Vol.2021 No.10

오일펜스는 해상에 유출된 기름을 포위 및 포집하고 민감자원으로부터 분리시키거나 회수지점으로 유도하기 위해 사용한다. 특히 기름오염사고시 초동조치로 기름 확산을 방지하는 아주 큰 역할을 한다. 본 연구에서는 현재 우리나라에서 가장 많이 사용하는 고형식 오일펜스 원단을 해수 및 기름에 장시간 노출시켜 본체부의 인장강도 변화를 확인하였다. 그 결과 두 인자 모두 인장강도 감소에 큰 영향을 미치는 것으로 확인되었으며, 노출기간과 온도에도 영향을 받았다. 노출시간에 따라서는 해수에 노출된 오일펜스 샘플은 5일 이후에는 시간이 경과함에도 비슷한 인장강도를 나타냈지만, 기름에 노출된 오일펜스는 지속적으로 인장강도가 감소되었다. 온도에 의한 영향은 해수나 기름에서 비슷한 경향을 나타냈다. 연구결과를 바탕으로 기존 오일 펜스 원단의 인장강도 내구성 강화방안을 강구하는 것이 이번 연구의 목적이다. Oil fence is used to encircle and capture oil spills at sea, to separate them from sensitive resources, or to guide them to a recovery point. Oil fences effectively prevent the spread of spilled oil on the sea, thereby reducing the damage to the marine environment. In this study, the change in the tensile strength of the main body part was confirmed by exposing the solid form type oil fence fabric most commonly used in Korea to seawater and oil for a long time. As a result, both factors were confirmed to have a significant effect on the reduction of tensile strength, and were also affected by the exposure period and temperature. According to the exposure time, the sample of oil fence exposed to seawater showed similar tensile strength even after 5 days, and the tensile strength of the boom exposed to oil continued to decrease. The effect of temperature showed a similar trend in seawater and oil. The purpose of this study is to devise a method to strengthen the tensile strength and durability of the existing boom fabric based on the research results.

유적의 파 중 및 오일펜스 주위에서의 거동에 관하여

송무석(Museok Song) 한국해양환경·에너지학회 2005 한국해양환경공학회 학술대회논문집 Vol.2005 No.11

C.M. Less's researches in KOSMEE publications is briefly reviewed. Professor Choung Mook Lee as the first president of KOSMEE not only led the birth of the society but also initiated a few key studies in the fluid mechanical aspects of oil fence's performance and spilt oil's fate. His investigations ranged over oil patch's drift on waves, interfacial behavior of oil layer and containment performance of oil fences using analytical, numerical and experimental methods. This article is to commemorate his blessed upcoming retirement and to help KOSMEE members understand his contribution to the society as a researcher.

물속에 잠긴 이중벽 주위의 유동특성에 관한연구

김진구,김정은,김동찬 한국기계기술학회 2019 한국기계기술학회지 Vol.21 No.6

When oil spill disaster on sea takes place, the most effective measure is to use oil fence with vertical wall. It has been big challenges that suitable oil fence in consideration of variety of variables such as wind speed, height of wave and current direction is chosen. And current characteristics below two of vertical wall was studied by PIV experiment with utilizing technic of visualized analysis like velocity distribution, contour of velocity and streamline pattern in flow characteristic between vertical wall of oil fence. In this study it is purposed to identify characteristics of inside water flow between two vertical walls depending on respective various water speeds to minimize outflow of floating article below bottom of vertical wall and observed that re-circulation flow and irregular vortex at certain places between two vertical walls occurred. Consequently, the study showed that failure of oil fence such as entrainment failure and submergence failure can be largely lessen by means of optimizing length between two vertical walls with water speeds.

오일펜스 유압 권취기에 적용되는 제어 알고리즘

양경욱 외 전남대학교 수산과학연구소 2006 수산과학연구소논문집 Vol.15 No.2

The this study deals with the self turing control of a hydraulic reel for oil fence. The STC has been designed to compensate for parameter changes such as pressure, oil viscosity and velocity. A suggestion of STC(Self tuning Control) are designed on the basic of modified Ziegler-Nichols criterion for digital control loops. The process is modelled as a controlled regression of the third order and its parameters estimated using the recursive least squares method with directional forgetting is applied. The algorithm is suitable for automatic setting of digital PID controllers for control the deterministic.

Behavior of Oil-Water Interface between Tandem Fences

Kwan Hyoung Kang(강관형),Choung Mook Lee(이정묵) 한국해양환경·에너지학회 1999 한국해양환경·에너지학회지 Vol.2 No.2

오일펜스 유압 권취기에 적용되는 제어 알고리즘

양경욱(Kyong Uk Yang),김태호(Tae Ho Kim),장덕종(Deok Jong Jang),김대안(Dae An Kim) 전남대학교 수산과학연구소 2006 수산과학연구소논문집 Vol.15 No.2

The this study deals with the self turing control of a hydraulic reel for oil fence. The STC has been designed to compensate for parameter changes such as pressure, oil viscosity and velocity. A suggestion of STC(Self tuning Control) are designed on the basic of modified Ziegler-Nichols criterion for digital control loops. The process is modelled as a controlled regression of the third order and its parameters estimated using the recursive least squares method with directional forgetting is applied. The algorithm is suitable for automatic setting of digital PID controllers for control the deterministic.

모형 실험과 수치 해석을 통한 단선용 모형 오일펜스의 성능 해석

김태호,장덕종,양경욱,나선철,김대안 한국수산과학회 2008 한국수산과학회지 Vol.41 No.2

This study evaluated the efficiency of an oil fence and spreading devices for one vessel in a towing tank. A series of model experiments and numerical calculations were conducted using an existing oil fence for two vessels and a new method for one vessel. Models of the oil fence and spreading devices were constructed on 1/20th scale from waterproofed nylon fabric and canvas. The tensions acting on the model of the oil fences and the horizontal distance between the spreading devices were calculated numerically while the oil fences were being towed. The results were extremely close to the results of the model experiments. The ratio of the opening width to the total length of the oil fence, which shows the efficiency of the oil fence for one vessel, was 49.7% in 0.4m/sec. Therefore, the proposed oil fence system should be very useful for oil containment at sea. As the opening width of the oil fence is not proportional to the length of the towing rope, it may be reasonable to maintain the towing rope at approximately 100m. Furthermore, a reasonable towing speed, when operating the oil fence for one vessel equipped with spreading devices, was within 0.4m/sec.

해안기름유출사고에 의한 기름확산 예측 방법 연구

김영복(Young-Bok Kim) 한국해양공학회 2011 韓國海洋工學會誌 Vol.25 No.2

When oil spills occur in the ocean because if a ship collision or grounding, the oil in the sea will spread to the coastline. To effectively and promptly prevent such an oil spread, the prediction of the direction and speed if the spreading oil must be made. By applying the coastal wave diffusion theory with a consideration of the effects of wind and current, the oil spreading direction and speed can be predicted promptly so that the National Disaster Prevention System can effectively and promptly take countermeasures against the attack and contamination if the coastline by such oil bands.

종황비에 따른 오일펜스용 모형 전개 장치의 전개력

김태호 외 전남대학교 수산과학연구소 2009 수산과학연구소논문집 Vol.18 No.1

In order to investigate the spreading performance of model canvas plates of spreading devices for oil fence by aspect ratios and spreading force FL and drag Fv acting on them in a circulating water channel, 3 types of rectangular canvas plates with aspect ratios of 1/1.2, 1, and 1.2, respectively were manufactured. FL and Fv is described as FL=Cd1/2)pSv2 and Fv=Cv(1/2)pS강, where p is water density, S is the projected area of canvas, and v is current speed, respectively. The maximum spreading force coefficients CL at current speed of 0.2, 04 and 0.6 mjs were 1.5-1.6 at attack angle of 32-380 in case of aspect ratio with 1/1.2, 1.7-1.8 at attack angle of 38-440 in case of aspect ratio with 1, and 1.8-1.9 at attack angle of 40-460 in case of aspect ratio with 1.2, respectively. In addition, the ratios of CL to Cv were 1.41 in case of aspect ratio with 1/1.2, 2.01 in 1, and 2.0, and 3-3.4 in 1.2, respectively.

종황비에 따른 오일펜스용 모형 전개 장치의 전개력

김태호(Tae Ho KIM),장덕종(Duck Jong JANG),양경욱(Kyong Uk YANG),김대안(Dae An KIM),나선철(Sun Chol NA) 전남대학교 수산과학연구소 2009 수산과학연구소논문집 Vol.18 No.1

In order to investigate the spreading performance of model canvas plates of spreading devices for oil fence by aspect ratios and spreading force FL and drag FD acting on them in a circulating water channel, 3 types of rectangular canvas plates with aspect ratios of 1/1.2, 1, and 1.2, respectively were manufactured. FL and FD is described as FL=CL(1/2)pSv² and FD=CD(1/2)pSv², where p is water density, S is the projected area of canvas, and v is current speed, respectively. The maximum spreading force coefficients CL at current speed of 0.2, 04 and 0.6 m/s were 1.5-1.6 at attack angle of 32-38° in case of aspect ratio with 1/1.2, 1.7-1.8 at attack angle of 38-44° in case of aspect ratio with 1, and 1.8-1.9 at attack angle of 40-46° in case of aspect ratio with 1.2, respectively. In addition, the ratios of CL to CD were 1.41 in case of aspect ratio with 1/1.2, 2.01 in 1, and 2.0, and 3-3.4 in 1.2, respectively.