• Title/Summary/Keyword: submarine structure

Search Result 82, Processing Time 0.024 seconds

A Case Research of Application of Submarine Structure for Discharge in the Power Plants (발전소 해양 배수 구조물의 적용사례)

  • Park, See-Boum;Bae, Dong-Chan
    • Proceedings of the Korean Geotechical Society Conference
    • /
    • 2008.10a
    • /
    • pp.1689-1692
    • /
    • 2008
  • In this research, these days extension of electric power station plant and new building plan is tending to more bigger size and much more cooling water for discharge, therefore submarine structure for discharge has needed various types and the large one. The domestic power plant was applied to once-through CW system structure that pipe line type, immersed PC-box culvert type and submarine headrace tunnel type of discharge structure. It is possible that the future structure type of submarine discharge is expected by a case research of application and plan.

  • PDF

A study on MBSE(Model-Based Systems Engineering) application method for concept design of submarine (잠수함 개념설계에 모델기반 시스템 엔지니어링을 적용하기 위한 방법에 대한 연구)

  • Bae, Jeong-Hoon;Kim, Byung-Mok;Kim, Mi-Hee;Shin, Sung-Chul;Kim, Soo-Young;An, Chin-Woo
    • Journal of the Korean Society of Systems Engineering
    • /
    • v.9 no.2
    • /
    • pp.7-14
    • /
    • 2013
  • Because submarine is high-technology and very complex system, it takes a lot of time, cost and manpower for design. For efficient concept design, application of systematic method is required such as system engineering. In this study, we studied application method of MBSE for submarine concept design with SWBS (Ship Work Breakdown Structure). Components of submarine system from SWBS were classified and organized as system architecture with 'Vitech CORE'. Through the MBSE application for concept design, systematic, efficient and traceable concept design of submarine was considered.

A Study on Protection of Rear Submarine of 5th percentile Female Dummy (5th%ile 여성 인체모형 뒷좌석 서브마린 방지에 대한 연구)

  • Kim, Hong Gyu;Yum, Sun Ill;Jin, Wook
    • Journal of Auto-vehicle Safety Association
    • /
    • v.9 no.3
    • /
    • pp.13-18
    • /
    • 2017
  • Since 2015, Euro-NCAP and C-NCAP have enhanced regulation on submarine of rear female passenger. This submarine regulation is a big obstacle to achieve the highest level crash performance. So the objective of this study is to develop new technical way to protect rear female passenger against submarine. In this study, we figured out how design factors of seatbelt affect submarine of rear female passenger by sled test. And we verified that rear passenger submarine can be improved by increasing intersection angle of seatbelt anchor and rotation amount of seatbelt buckle. Based on these results, this paper proposes a new invention of seatbelt buckle and anchor that can improve rear passenger submarine. One is seatbelt buckle that can be detached from stopper to prevent rotation and the other is seatbelt anchor that can be changed the structure so as to incline forward during crash. Finally we proved that submarine of rear female passenger can be improved by the effectiveness of new inventions.

A hybrid algorithm of underwater structure vibration and acoustic radiation-propagation in ocean acoustic channel

  • Duan, Jia-xi;Zhang, Lin;Da, Liang-long;Sun, Xue-hai;Chen, Wen-jing
    • International Journal of Naval Architecture and Ocean Engineering
    • /
    • v.12 no.1
    • /
    • pp.680-690
    • /
    • 2020
  • In ocean environment, the sound speed gradient of seawater has an important influence on far field sound propagation. The FEM/BEM is used to decouple the vibroacoustic radiation of the spherical shell, and the Green function of the virtual source chain is adopted for decoupling. For far field radiated Sound Pressure Level (SPL), the Beam Displacement Ray normal Mode (BDRM) is employed. The vibration and near-/far-field radiated SPL of spherical shell is analyzed in shallow sea uniform layer, negative/positive gradient, negative thermocline environment, and deep-sea sound channel. Results show that the vibroacoustic radiation of spherical shell acted at 300Hz can be analogous to dipole. When the radiated field of the spherical shell is dominated by large-grazing-angle waves, it can be analogous to vertically distributed dipole, and the far field radiated SPL is lower; while similar to horizontally distributed dipole if dominated by small-grazing-angle waves, and the far field SPL is high.

Arrangement Template Model for the Arrangement Optimization of Compartments and Equipment of a Submarine (잠수함의 구획 및 장비 배치 최적화를 위한 배치 템플릿 모델)

  • Kim, Ki-Su;Roh, Myung-Il;Kim, Sung-Yong;Ahn, Jin-Woo
    • Korean Journal of Computational Design and Engineering
    • /
    • v.21 no.1
    • /
    • pp.51-60
    • /
    • 2016
  • The arrangement design of a submarine has been performed based on data of parent ships and experts' experiences. To support such a task, it is necessary to accumulate and use systematically the data, and to optimize the task. The expert system for the first issue and the optimization method for the latter issue can be used. At this time, a suitable data structure to share the data on the arrangement design of the submarine should be used. In this study, the data structure named an arrangement template model (ATM) is proposed. To check the applicability of the ATM, a prototype program which consists of the expert system and the optimization method is developed. Finally, the developed program is applied to a small submarine of US Navy. As a result, it is confirmed that the ATM can be used to share the data between the expert system and the optimization method.

Shallow Crustal Structure of the Bransfield Basin Using an Autonomous Underwater Hydrophone

  • Kim, Kee-Hoon;Park, Min-Kyu;Hong, Jong-Kuk;Lee, Joo-Han
    • Journal of the Korean Geophysical Society
    • /
    • v.9 no.4
    • /
    • pp.351-359
    • /
    • 2006
  • We investigated subsurface structures of the Bransfield Basin, the Antarctic with AUH (Autonomous Underwater Hydrophne) which was designed to record abyssal T-waves generated from submarine earthquakes. The data obtained from a multi-channel seismic survey and an AUH were used for this study. A seismic reflection method was applied to the multi-channel seismic survey data in order to identify bathymetry and sedimentary structures, and the signals recorded in the AUH were used to obtain deep structures as we applied a seismic refraction method. Even though we couldn’t investigate deeper and detailed structure in study area because of lack of Airgun’s capacity, the AUH showed possibilities for being used for a marine seismic survey. From this experiment, we decided the upper and lower sediment layer velocities, detected irregular basement topography probably caused by submarine volcanic/magmatic activities, and retrieved the velocity of the basement and the depth of the sediment layer/basement boundary.

  • PDF

Theoretical evaluation of collision safety for Submerged Floating Railway Tunnel (SFRT) by using simplified analysis

  • Seo, Sung-il;Moon, Jiho;Mun, Hyung-Suk
    • Structural Engineering and Mechanics
    • /
    • v.64 no.3
    • /
    • pp.293-299
    • /
    • 2017
  • Submarine collisions is one of the major hazardous factor for Submerged Floating Railway Tunnel (SFRT) and this study presents the safety evaluation for submarine collision to SFRT by using theoretical approach. Simplified method to evaluate the collision safety of SFRT was proposed based on the beam on elastic foundation theory. Firstly, the time history load function for submarine collision was obtained by using one-degree-of-freedom vibration model. Then, the equivalent mass and stiffness of the structure were calculated, and the collision responses of SFRT were evaluated. Finite element analysis was conducted to verify the proposed equations, and it can be found that the collision responses, such as deflection, and acceleration, agreed well with the proposed equations. Finally, derailment condition for high speed train in SFRT due to submarine collision was proposed.

Structure-Fluid Interaction Analysis for the Submarine LOX Tank subjected to Underwater Explosion Impact (수중 폭발 충격을 받는 잠수함 액화 산소 탱크의 구조-유체 연성 해석)

  • Shin, Hyung-Cheol;Kim, Gyu-Sung;Kim, Jae-Hyun;Jeon, Jae-Hwang
    • Proceedings of the KSME Conference
    • /
    • 2004.11a
    • /
    • pp.419-424
    • /
    • 2004
  • we performed the underwater explosion analysis for the liquefied oxygen tank - a kind of fuel tank of a mid-size submarine, and tried to verify the structural safety for this structure. First, we reviewed the theory and application of underwater explosion analysis using Structure-Fluid Interaction technique and its finite element modeling scheme. Next, we modeled the explosive and sea water as fluid elements, the LOX tank as structural elements and the interface between two regions as ALE scheme. The effect on shock pressure and impulse of fluid mesh size and shape are also investigated. As the analysis result, the shock pressure due explosion propagated into the water region and hit the structure region. The plastic deformation and the equivalent stress highly appeared at the web frame and the shock mount of LOX structure, but these values were acceptable for design criteria.

  • PDF

A Study of Structure-Fluid Interaction Technique for Submarine LOX Tank under Impact Load of Underwater Explosion (수중폭발 충격하중을 받는 잠수함 액화산소 탱크의 구조-유체 상호작용 기법에 관한 연구)

  • KIM JAE-HYUN;PARK MYUNG-KYU
    • Journal of Ocean Engineering and Technology
    • /
    • v.19 no.1 s.62
    • /
    • pp.20-25
    • /
    • 2005
  • The authors performed the underwater explosion analysis for the liquified oxygen tank - a kind of fuel tank of a mid-size submarine, and tried to verify the structural safety for this structure. First, the authors reviewed the theory and application of underwater explosion analysis, using a Structure-Fluid Interaction technique and its finite element modeling scheme. Next, the authors modeled the explosive and sea water as fluid elements, the LOX tank as structural elements, and the interface between the two regions as the ALE scheme. The effect on shock pressure and impulse of fluid mesh size and shape are also investigated. Upon analysis, it was found that the shock pressure due to explosion propagated into the water region, and hit the structure region. The plastic deformation and the equivalent stress were apparent at the web frame and the shock mount of LOX structure, but these values were acceptable for the design criteria.

Mapping Submarine Bathymetry and Geological Structure Using the Lineament Analysis Method

  • Kwon, O-Il;Baek, Yong;Kim, Jinhwan
    • The Journal of Engineering Geology
    • /
    • v.24 no.4
    • /
    • pp.455-461
    • /
    • 2014
  • The Honam-Jeju, Korea-Japan, and Korea-China subsea tunnel construction projects have drawn significant attention since the early 2000s. These subsea tunnels are much deeper than most existing natural shallow sea tunnels linking coastal areas. Thus, the need for developing new technologies for the site selection and construction of deep subsea tunnels has recently emerged, with the launch of a research project titled "Development of Key Subsea Tunnelling Technology" in 2013. A component of this research, an analysis of deep subsea geological structure, is currently underway. A ground investigation, such as a borehole or geophysical investigation, is generally carried out for tunnel design. However, when investigating a potential site for a deep subsea tunnel, borehole drilling requires equipment at the scale of offshore oil drilling. The huge cost of such an undertaking has raised the urgent need for methods to indirectly assess the local geological structure as much as possible to limit the need for repeated borehole investigations. This study introduces an indirect approach for assessing the geological structure of the seafloor through a submarine bathymetry analysis. The ultimate goal here is to develop an automated approach to the analysis of submarine geological structures, which may prove useful in the selection of future deep subsea tunnel sites.