• 항공우주기술
• /
• 제4권1호
• /
• pp.45-48
• /
• 2005

본 논문은 광학탑재체 지지구조물의 열지향오차 해석기법에 대한 연구이다. 광학탑재체 지지구조물의 열지향오차 해석을 수행하기 위해서는 위성본체 전체의 유한요소모델을 필요로 한다. 그러나 광학탑재체 지지구조물의 초기 설계시 위성본체의 유한요소모델이 정해지지 않기 때문에, 열지향오차 해석시 유한요소모델이 존재하지 않더라도 위성본체에 의한 열지향오차를 유도하는 해석기법이 필요하게 된다. 본 논문에서는 이러한 해석기법과 실제 해석시 이를 반영하는 구체적인 방법에 대해서 서술한다.

• 한국정밀공학회지
• /
• 제19권2호
• /
• pp.171-176
• /
• 2002

This paper is the study on stress analysis of spur gear using a finite element method. Gear drives constitute very important mechanisms in transmitting mechanical power processes compromising several cost effective and engineering advantages. The load transmission occurred by the contacting surfaces arises variable elastic deformations which are being evaluated through finite element analysis. The automatic gear design program is developed to model gear shape precisely. This gear design system developed was used by pre-processor of FEM packages. The distribution of stresses at contacting surfaces was examined when a pair of gear contact.

• 한국건축시공학회:학술대회논문집
• /
• 한국건축시공학회 2021년도 가을 학술논문 발표대회
• /
• pp.96-97
• /
• 2021

In the Building Act, performance-based fire safety design is being promoted for institutionalization. The behavior of the structure against fire conditions can be predicted by using the advanced numerical analysis method based on the FEM (Finite Element Method) to predict the entire structural behavior including the behavior of the structure, but there is a limit to expressing the fire properties of the space and predicting the fire properties It is difficult to determine the variables to be transmitted to the FEM (Finite Element Method) model from the fire simulation results using FDS (Fire Dynamics Simulator). Accordingly, the purpose of this study is to introduce the code user's manual for FDS and FEM unidirectional coupling analysis.

• 한국소음진동공학회:학술대회논문집
• /
• 한국소음진동공학회 2012년도 춘계학술대회 논문집
• /
• pp.150-154
• /
• 2012

A flow induced mechanical vibration and acoustic resonance should be considered at design stage because they are mainly occurred in the tube bank of boiler. Acoustic resonance is occurred when the vortex shedding frequency of tube bank coincides with the acoustic natural frequency of the cavity. Effective solution to avoid acoustic resonance is installing acoustic baffles in the tube banks parallelly inside of the flow cavity. Thus, location and number of acoustic baffles should be exactly calculated to eliminate the acoustic resonance. This paper presents case study of acoustic resonance due to inappropriate number and location of acoustic baffles. Measured frequency and mode in the study is verified by FEM acoustic modal analysis. The number and location of acoustic baffles to avoid acoustic resonance are calculated by using FEM acoustic modal analysis.

• Computers and Concrete
• /
• 제29권3호
• /
• pp.161-168
• /
• 2022

Bridges using double-tee (DT) girders from 12 m to 15 m are one of the good choices to improve accessibility in rural areas of the Mekong River Delta. In this study, nonlinear finite element method (FEM) analysis was conducted with different constitutive laws of materials. The FEM analysis results were compared to experimental results to confirm the applicability of the constitutive laws of materials for DT girders. A parametric study through FEM analysis was then conducted to investigate the effect of span lengths, top flange depths, and a number of prestressing tendons on the capacity of DT girders in order that propose DT girders for rural bridges. Parametric results showed that the top flange depth of a DT girder for rural bridges could be 120 mm. The DT girder with a span length of 12 m or 13 m could be used 16 tendons, while the DT girder with a span length of 14 m or 15 m could be set up with 20 tendons. The prestressed concrete DT girders based on FEM results can be suggested for the construction of rural bridges.

• 한국전산유체공학회:학술대회논문집
• /
• 한국전산유체공학회 2007년도 추계 학술대회논문집
• /
• pp.111-114
• /
• 2007

Computational Fluid Dynamics (CFD) and the Finite Element Method (FEM) are used to perform aerodynamics analysis and structure analysis. For the fluid-structure interaction analysis, each technology should be considered as well. The process of aerodynamics-structure coupled analysis can be applied to various integrated analyses from many research fields. In this study, the aerodynamics-structure coupled analysis is performed for the missile at high angle of attack condition through the use of Computational Fluid Dynamics (CFD) and the Finite Element Method (FEM). For this purpose, the aerodynamics-structure coupled analyses procedure for the missile are established. The results of the integrated analysis are compared with rigid geometry of the missile and the effect of the deformation will be addressed.

• 한국정밀공학회:학술대회논문집
• /
• 한국정밀공학회 2004년도 추계학술대회 논문집
• /
• pp.137-140
• /
• 2004

Intervertebral cages in the cervical spine have been advantage in spinal fusion to relieve low back pain. In this study the effects of an intervertebral cage insertion on a cervical spine functional spinal unit investigate and cage structural analysis using finite element method. Three-Dimensional finite element models to create computed tomography (CT) scan C3-C4, obtain healthy young male which 1-mm slice section.

• 조명전기설비학회논문지
• /
• 제20권8호
• /
• pp.80-87
• /
• 2006

본 논문에서는 3차원 FEM을 이용하여 Claw pole stoning motor의 특성을 해석하였다. Claw pole stewing motor는 구조상 z-축 방향으로 자화가 발생하고 모델의 특성상 3차원 FEM해석이 필수적이다. 해석 시간을 고려해 볼 때 목적하고자 하는 성능을 갖는 모터 설계 시 시간을 효율적으로 줄이기 위한 방법 중 하나는 해석 대상의 개수를 줄이는 것이다. 이에 본 논문에서는 실험계획법(Design of Experiments)을 이용하여 Claw pole stewing motor의 해석 및 설계 시 중요 변수인 영구자석, 폴형상, 권선수의 설계 변수를 설정하여 이 설계변수의 조합으로 나오는 해석 모델의 개수를 최소화하고 이렇게 줄어든 최적의 모델을 선정하여 3차원 FEM으로 해석하여 특성을 살펴보았다.

• 한국지반공학회논문집
• /
• 제19권4호
• /
• pp.65-74
• /
• 2003

본 논문에서는 사면안정해석에 있어서의 유한요소법과 한계평형법의 결과를 나타내었다 해석의 타당성을 부여하기 위하여 유한요소법과 한계평형법에 의한 안전율을 비교하였으며, 각각의 방법에 의한 안전율이 잘 일치됨을 보여 전단강도감소기법을 사용한 유한요소해석이 사면안정해석에 있어서 효과적으로 사용될 수 있음을 확인하였다. 구성 법칙, 사면의 경사각, 흐름법칙, 그리고 유한요소망의 이산화에 따른 일련의 유한요소해석을 실시한 결과, 전단강도감소기법에 근거한 유한요소해석법은 안전율에 관하여 합리적인 결과를 제공할 수 있음을 확인하였고 유한요소해석결과는 구성법칙과 흐름법칙의 선택에 의해 상당한 영향을 받을 수 있음을 알 수 있다.

• 한국자동차공학회논문집
• /
• 제20권6호
• /
• pp.67-72
• /
• 2012

Novel Front End Module(FEM) with improved pedestrian protection is very important to reduce the severity of pedestrian injury. The FEM needs to have enough space from hood to absorb the energy from any pedestrian collision. In this study, the cooling performance of the FEM to cool the engine was investigated under 25% height reduction. The results indicated that the cooling performance analysis was about 86% level compared to that of the conventional FEM. Also, good qualitative agreement between CFD predictions and experimental measurements was found. This FEM needs the cooling performance enhancement for changed air flow path at the frontal part of vehicle. Therefore, we showed an improved performance using air guide setup and shape modification under the high load condition.