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내진검증(안전)을 위한 실험적 고찰을 이용한 해석 모델 개발연구
서욱환 한국산업안전학회 1998 한국안전학회지 Vol.13 No.4
이 논문은 기기검증 중 내진검증(안전)을 위한 접근방법의 일환으로 실험을 통한 유한요소 해석모델을 개발하였다. 이 모델은 한국원자력연곽소 내의 하나로원자로 전기설비 중의 일부분인 UPS를 내진검증하기 위한 것이다. 이 시험증명용 모델은 50㎐ 미만의 모든 주요 모드에서 고유진동수가 약 5%이내의 오차를 갖는 값을 예측하였다. 이 모델은 내진검증을 위한 최종 응력해석에 적합하였으며 실제 기기의 동적특성의 예측에 고 정밀도를 보여주었다. This paper includes discussion on developing the test verified finite element model for one of the seismic qualification (safety) approaches. It presents a test verified finite element model of a UPS(Uninten-uptible Power Supply System) to be used at KMRR, KAERI. The test verified model predicts natural frequencies within 5 percent error for all major modes below 50㎐. This model accurately represents the dynamic characteristics of the actual hardware and is qualified for its use in the final stress analysis for seismic verification.
서욱환 한라대학교 2006 論文集 Vol.9 No.-
알루미늄 다이 캐스팅에서 지르코니아 코팅을 이용하여 금형의 수명연장 방법을 연구하였다 이 방법은 새로운 나노-스케일 기술을 이용한 실험연구로써 국내 자동차의 부품생산을 위한 다이캐스팅 금형의 일부분인 코어 및 핀을 대상으로 Cubic Zirconia 주입-코팅 기술을 적용하였다 이번 연구에서는 기존의 해석기법을 병행하여 수행하였는데 수명연장을 위한 금형부분에 대한 Multilayer 혹은 Graded Coating 구조에 대한 유한요소기법을 적용하였다 적용된 FEM 소프트웨어는 비선형 열적 기계학적인 모델로서 코팅이 최적화된 지엽모델에 적용되어 민감한 지역의 Strain Field를 결정하기 위한 두 단계 방법이 적용되었다 결과적으로 이 적용기술이 금형의 수명을 현저히 연장하여 주었으며 금형의 파손으로 인한 복잡성 및 경제성에 큰 도움을 줄 것으로 예상되어 자동차부품의 전반적인 수명연장연구의 필요성을 부각시켰다
변위 불연속 방법에 의한 모드 III 꺾인 균열 해석 연구
서욱환 대한용접접합학회 2000 대한용접·접합학회지 Vol.18 No.4
An integral equation representation of cracks was presented, which differs from well-known "dislocation layer" representation. In this new representation, an integral equation representation of cracks was developed and coupled to the direct boundary-element method for treatment of cracks in plane finite bodies. The method was developed for in-plane (modes I and II) loadings only. In this paper, the method is formulated and applied to mode III problems involving smooth or kinked cracks in finite region. The results are compared to exact solutions where available and the method is shown to be very accurate despite of its simplicity.implicity.
유한영역에서의 꺾인균열 해석을 위한 적분방정식 적용 연구
서욱환 대한기계학회 1993 대한기계학회논문집 Vol.17 No.9
An integral equation representation of cracks was presented which differs from well-known "dislocation layer" representation. In this new representation, the equations are written in terms of the displacement discontinuity across the crack surfaces rather than derivatives of the displacement-discontinuity. It was shown in that the new technique is well-suited to the treatment of kinked cracks. In the present paper, this integral equation representation is coupled to the direct boundary-element method for the treatment of finite bodies containing kinked cracks. The method is demonstrated for two-dimensional finite domains but extension to three-dimensional problems would appear to be possible. The resulting approach is shown to be simple, yet very accurate. accurate.
서욱환 한국원자력학회 2011 Nuclear Engineering and Technology Vol.43 No.4
This paper is a study on a nuclear water chiller. It presents a test-verified finite element model of a water chiller to be used at a Nuclear Power Plant. The test-verified model predicts natural frequencies within 5% for all major modes below 50Hz. This model accurately represents the dynamic characteristics of the actual hardware and is qualified for its use in the final stress analysis for seismic verification.
서욱환 한라대학교 2009 論文集 Vol.12 No.-
In this paper a thermally coupled disc brake analysis are discussed A three-dimensional model of the entire disc with pads is touching only part of the circumference The disc is rotated so that the heat is generated by friction This problem is solved using ABAQUS/Standard and ABAQUS/Explicit The analysis models a linear decrease in velocity as a result of braking The temperature is greatest at the interfaces between the disc and pads and the heat has Just started to conduct into the disc A displaced plot of the model at the end of the analysis shows the characteristic conical deformation due to thermal expansion It is clear that ABAQUS analysis is very useful for this coupled disc brake analysis
유한영역에서 안전을 위한 여러 형태의 균열 해석용 적분방정식 적용연구
서욱환 한국산업안전학회 1999 한국안전학회지 Vol.14 No.1
An integral equation representation of cracks was presented, which differs from well-known $quot;dislocation layer$quot; representation. In this new representation, the integral equation representation of cracks was developed and coupled to the direct boundary-element method for treatment of cracks in finite plane bodies. The method was developed for in-plane(mode I and II) loadings only. In this paper, the method is formulated and applied to various crack problems involving multiple and branch cracks in finite region. The results are compared to exact solutions where available and the method is shown to be very accurate despite of its simplicity.