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RISS 인기검색어
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- 저자 : Friebe, Martin (검색결과 5 건)
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A parametric study on the use of passive fire protection in FPSO topside module
Friebe, Martin,Jang, Beom-Seon,Jim, Yanlin The Society of Naval Architects of Korea 2014 International Journal of Naval Architecture and Oc Vol.6 No.4
Fire is a continuous threat to FPSO topside modules as large amounts of oil and gas are passing through the modules. As a conventional measure to mitigate structural failure under fire, passive fire protection (PFP) coatings are widely used on main structural members. However, an excessive use of PFP coatings can cause considerable cost for material purchase, installation, inspection and maintenance. Long installation time can be a risk since the work should be done nearly at the last fabrication stage. Thus, the minimal use of PFP can be beneficial to the reduction of construction cost and the avoidance of schedule delay. This paper presents a few case studies on how different applications of PFP have influence on collapse time of a FPSO module structure. A series of heat analysis and thermal elasto-plastic FE analysis are performed for different PFP coatings and the resultant collapse time and the amount of PFP coatings are compared with each other.
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A parametric study on the use of passive fire protection in FPSO topside module
Martin Friebe,장범선,Yanlin Jim 대한조선학회 2014 International Journal of Naval Architecture and Oc Vol.6 No.4
Fire is a continuous threat to FPSO topside modules as large amounts of oil and gas are passing throughthe modules. As a conventional measure to mitigate structural failure under fire, passive fire protection (PFP) coatingsare widely used on main structural members. However, an excessive use of PFP coatings can cause considerable costfor material purchase, installation, inspection and maintenance. Long installation time can be a risk since the workshould be done nearly at the last fabrication stage. Thus, the minimal use of PFP can be beneficial to the reduction ofconstruction cost and the avoidance of schedule delay. This paper presents a few case studies on how different applicationsof PFP have influence on collapse time of a FPSO module structure. A series of heat analysis and thermalelasto-plastic FE analysis are performed for different PFP coatings and the resultant collapse time and the amount ofPFP coatings are compared with each other.
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Advantages of Prefabricated Tunnel Junction-Based Molecular Spintronics Devices
Pawan Tyagi,Edward Friebe,Collin Baker 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2015 NANO Vol.10 No.4
Molecule-based devices may govern the advancement of the next generation's logic and memory devices. Molecules have the potential to be unmatched device elements as chemists can mass produce an endless variety of molecules with novel optical, magnetic and charge transport characteristics. However, the biggest challenge is to connect two metal leads to a target molecule (s) and develop a robust and versatile device fabrication technology that can be adopted for commercial scale mass production. This paper discusses distinct advantages of utilizing commercially successful tunnel junctions as a vehicle for developing molecular spintronics devices. We describe the use of a prefabricated tunnel junction with the exposed sides as a testbed for molecular device fabrication. On the exposed sides of a tunnel junction molecules are bridged across an insulator by chemically bonding with the two metal electrodes; sequential growth of metal–insulator–metal layers ensures that separation between two metal electrodes is controlled by the insulator thickness to the molecular device length scale. This paper highlights various attributes of tunnel junction-based molecular devices with ferromagnetic electrodes for making molecular spintronics devices. We strongly emphasize a need for close collaboration between chemists and magnetic tunnel junction (MTJ) researchers. Such partnerships will have a strong potential to develop tunnel junction-based molecular devices for futuristic areas such as memory devices, magnetic metamaterials, high sensitivity multi-chemical biosensors, etc.
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부유식 해상 풍력 발전기의 운동 방정식 구성 자동화를 위한 Multibody Formalism 개발
구남국,조아라,Martin Friebe,이규열 대한조선학회 2011 대한조선학회 학술대회자료집 Vol.2011 No.6
본 논문에서는 부유식 해상 풍력 발전기의 설계와 생산 계획 단계에서 필요로 하는 동적 거동 및 동적 하중 계산을 위하여, 다물체계 동역학을 기반으로 multibody formalism 을 개발 하였다. 부유식 해상 풍력 발전기는 부유식 플랫폼 위에 타워(tower), 낫셀(nacelle), 허브(hub), 그리고 3 개의 블레이드(blade)가 고정 관절(fixed joint) 또는 회전 관절(revolute joint)로 연결되어 있는 다물체계 시스템(multibody system)으로 정의할 수 있다. 본 논문에서는 다물체계 동역학 기반의 recursive formulation 을 이용하여 운동 방정식을 구성하고 있다. 본 연구에서 개발한 multibody formalism 은 그래프 이론을 바탕으로 하여 다물체계 시스템을 구성하고 있는 물체의 형상정보, 속성정보, 그리고 물체들 간의 연결관계를 입력 받아 운동방정식을 자동으로 구성하고, 수치적 해를 계산하는 기능을 한다. 부유식 해상 풍력 발전기의 보다 정확한 동역학적 거동해석을 위하여 부유식 풍력 발전기의 임의자세를 고려한 비선형 유체 정역학적 힘(hydrostatic force with non-linear effects)과 3D Rankine panel 방법을 이용하여 계산한 선형 유체 동역학적 힘(linearized hydrodynamic force), blade element method(BEM)을 이용하여 계산한 풍력(aerodynamic force), 그리고 계류력(mooring force) 계산 모듈을 개발하였다. 그리고 외력 계산 모듈을 multibody formalism 과 통합하여 다물체계 시스템의 운동 방정식과 동시에 풀어 부유식 해상 플랫폼에 작용하는 동적 하중을 계산 하였다.
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역학 기반 이산 사건 시뮬레이션을 위한 다물체계 동역학 커널 개발
구남국,조아라,Martin Friebe,이규열,노명일 대한조선학회 2011 대한조선학회 학술대회자료집 Vol.2011 No.11
There are several kinds of mechanical systems that are under event-triggered conditions. For the dynamic analysis of such mechanical systems, a simulation program that can generate equations of motion for mutibody systems in the discrete-event simulation framework was developed. For complex multibody systems, a dynamics kernel was developed to generate the equations of motion for multibody systems based on multibody dynamics. To generate the equations of motion, the recursive formulation method was used. Using the developed dynamics kernel, the dynamic responses of multibody systems can be carried out under continuous conditions. The general multibody dynamics kernel, however, cannot deal with discontinuous-state variables and event-triggered conditions. The multibody dynamics kernel, therefore, was integrated into the discrete-event simulation program to deal with multibody systems in discontinuous environments. The discrete-event simulation program was developed based on the discrete-event system specification (DEVS) formalism, which is a modular and hierarchical formalism for analyzing systems under event-triggered conditions.
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