• 대한기계학회논문집A
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• 제41권5호
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• pp.361-366
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• 2017

컴퓨팅 아키텍처와 응용 소프트웨어 기술의 발달로 최근에는 근사가 아닌 실제 물리계 모사라는 컴퓨터 시뮬레이션의 궁극 목표가 현실 이슈로 대두되고 있다. 본 논문에서는 미국 정부 주도 슈퍼컴퓨팅 기반 다물리 시뮬레이션 사업의 결과물로 나온 일리노이 대학의 일리노이 록스타라는 유체-구조-연소 연성 해석툴을 활용하여 충격파관 내의 금속판의 미소 시간 운동을 전산모사하고 기존 실험, 해석들과 비교하는 연구를 수행하였다. 전산유동해석은 정렬격자를 기반으로 하였고 구조해석은 대변형 선형탄성을 가정하였다. 또한 강한 연계 시간적분법이 적용된 알고리즘의 고도화로 인해 충격파 내 금속패널에 관한 높은 수준의 실험-계산 상관성을 보였다. 본 연구의 제한적인 검증연구를 확장하여 해석환경 내 추가 모듈들의 검증작업들과 코드개선을 통해 오픈소스 기반 연구개발 도구로서 활용할 예정이다.

• 한국소음진동공학회논문집
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• 제15권1호
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• pp.96-104
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• 2005

The coupled vibration characteristics for the fluid-structure interaction systems are investigated through the finite element method. The present paper is focused on vibration characteristics of the cylindrical fluid-storage tank with a baffle. The tank is partially filled with an inviscid and irrotational fluid having a free surface. A baffle is assumed here to have the shape of a thin annular plate and a conical shell, attached to the cylindrical tank and positioned below the fluid surface. The liquid domain is limited by a rigid flat bottom. As the effect of free surface waves is taken into account in the analysis, the bulging and sloshing modes are studied. To demonstrate the validity of present results, they are compared with the published ones. The effect of positions and inner-to-outer radius ratio of annular baffle and setting angles of conical baffle on coupled vibration characteristics is investigated.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2010년도 추계학술대회 논문집
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• pp.461-462
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• 2010

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2010년도 추계학술대회 논문집
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• pp.523-524
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• 2010

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2010년도 추계학술대회 논문집
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• pp.269-270
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• 2010

• 대한조선학회논문집
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• 제47권5호
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• pp.681-688
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• 2010

During certification of freefall lifeboats, it is necessary to estimate the injury potential of the impact loads exerted on the occupants during water entry. This paper focused on the numerical simulation to predict the acceleration response during the impact of freefall lifeboats on the water using FSI(Fluid-Structure Interaction) analysis technique of LS-DYNA code. FSI problems could be conveniently simulated by the overlapping capability using Arbitrary Lagrangian Eulerian(ALE) formulation and Euler-Lagrange coupling algorithm of LS-DYNA code. Through this study, it could be found that simulation results were in relatively good agreement with experimental ones in the acceleration peak values, and that the loading conditions were very sensitive to the acceleration responses by the experimental and simulation results.

• 한국수소및신에너지학회논문집
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• 제28권1호
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• pp.113-119
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• 2017

An investigation on aerodynamic performance of a highly-loaded axial fan has been conducted to find the effects of tip injection and casing groove on aerodynamic performance in this study. Three-dimensional Reynolds-averaged Navier-Stokes equations with $k-{\varepsilon}$ turbulence model were used to analyze the fluid flow in the fan with Fluid-Structure Interaction (FSI) analysis. The hexahedral grid was used to construct computational domain, and the grid dependency test drew the optimal grid system. FSI analysis was also carried out to predict the deformation of rotor and stator blades, and the effect of deformation on the aerodynamic performance of axial fan was analyzed compared to the performance predicted without FSI analysis.

• 대한조선학회논문집
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• 제55권5호
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• pp.421-430
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• 2018

The shape of a yacht sail made of thin fabric materials is easily deformed by wind speed and direction and it is affected by the deformation of the standing rig such as mast, boom, shrouds, stays and spreaders. This deformed sail shape changes the air flow over the sail, it makes the deformation of the sail and the rig again. To get a sail performance accurately these interactive behavior of sail system should be studied in aspects of the aerodynamics and the fluid-structure interaction. In this study aerodynamic analysis for the sail system of a 30 feet sloop is carried out and the obtained dynamic pressure on the sail surface is applied as the loading condition of the calculation to get the deformations of the sail shape and the rig. Supporting forces by rig are applied as boundary condition of the structure deformation calculations. And the characteristics of the air flow and the dynamic pressure over the deformed sail shape is investigated repeatedly including the lift force and the location of CE.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2008년도 추계학술대회A
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• pp.560-564
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• 2008

풍력발전에 사용하는 풍력터빈의 블레이드의 적어도 20년 이상의 설계수명이 요구된단. 블레이드는 바람에 의한 압력, 지지대 구조에 의해서 가해지는 힘과 모멘트에 의해 블레이드에 변형이 가해진다. 특히 바람에 의해 블레이드는 연속적인 하중을 받아서 재료를 손상시킨다. 본 연구에서는 블레이드와 허브로 구성된 모델을 이용하여, 전산유체해석을 일차적으로 수행하여 블레이드 주변의 압력분포를 구하였다. 계산된 압력을 이용하여 다음 단계로 유한요소해석을 수행하여 블레이드 재료에 발생하는 응력을 계산하여 피로해석을 수행하였다. 피로해석을 통해 재료에 미치는 손상률을 구하였다. 다양한 블레이드 피치 각도과 바람의 속도에 따라 해석결과를 비료 분석하였다.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2002년도 학술대회지
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• pp.607-610
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• 2002

As machines become smaller and faster multileaf foil bearings are used to overcome the problems with heat, friction and wear Systems with foil bearings do not need a separate system for lubrication. These bearings are self acting and are therefore green systems. Until now, there have been many studies on the structural and dynamical performances. Therefore the object of the present study is to predict the flow and structural characteristics by using the Fluid/structure interaction method. The increase in RPM led to the increase in pressure, temperature difference, maximum velocity, Mach number, shear stress and torque. In the case of 90,000 RPM effects such as choking led to a non-lineararity in the system. Also the effect of eccentricity ratio was observed and showed that eccentricity increased the maximum pressure and the density difference while decreasing the shear stress and torque.