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- 저자 : 정남근(Nam Gun Jung) (검색결과 5 건)
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Metallurgical Failure Analysis on a Suspension Clamp in 154kV Electric Power Transmission Tower
이재홍,정남근,Lee, Jaehong,Jung, Nam-gun Korea Electric Power Corporation 2021 KEPCO Journal on electric power and energy Vol.7 No.2
Failure of a suspension clamp made of hot dip galvanized cast iron in 154kV transmission tower was investigated. Metallurgical analysis of a crack of the clamp was performed using a digital microscope, an optical microscope, and a scanning electron microscope. It was revealed that the crack surface was covered by continuous zinc layer. Distinctive casting skin was found underneath both the outer surface and crack surface. The result showed that pre-existing crack had been formed in the fabrication, and liquid metal embrittlement during hot dip galvanization may assist crack propagation.
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비파괴기술을 이용한 발전설비 예측정비 기법 도입과 적용
정계조(Gye-jo Jung),정남근(Nam-gun Jung) 한국비파괴검사학회 2010 한국비파괴검사학회지 Vol.30 No.5
발전회사는 설비 신뢰성과 이용율 저하없이 운영 및 정비비용을 낮추라는 요구를 받고 있다. 설비 운영자는 이러한 요구사항에 부합하기 위하여 현재의 정비기술에 대하여 다시 평가를 하고 있다. 정비비용을 낮추고 효율적인 운영 기간을 늘리기 위하여 설비의 최적 운영상태를 확인할 수 있는 비파괴기술을 이용하여 예측정비 기법을 적용할 수 있다. 예측정비 프로그램에는 내부운영 프로그램과 외부프로그램 그리고 혼용 프로그램이 있으며, 현명한 신뢰 (smart thrust)개념을 사용하면 예측정비 프로그램을 성공적으로 적용할 수 있다. Many forces are pressuring utilities to reduce operating and maintenance costs without cutting back on reliability or availability. Many utility managers are re-evaluating maintenance strategies to meet these demands. To utilities how to reduce maintenance costs and extent the effective operating life of equipment, predictive maintenance technique can be adapted. Predictive maintenance has three types program which arc in-house program, engineering company program and mixed program. We can approach successful predictive maintenance program with "smart trust" concept.
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강명수(Myung-soo Kang),윤완노(Wan-no Yun),정남근(Nam-gun Jung),김준성(Jun-sung Kim) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
The vibration increased suddenly during the normal operation of the gas turbine in cogeneration plant. The subsequent disassembly showed one blade of compressor 5th stage fractured and many downstream blades were damaged. The OEM redesigned and replaced the 5th blades already, because the 5th blade failure had occurred before. Optical microscope and scanning electron microscope inspection of the blade which had the same indication by the non-destructive test showed the forging defect at the same location with the fractured blade. The forging defect might be induced by the insufficient removal of surface crack and scale or foreign object inclusion in the process of hot forging. The defect existed at the highly stressed area and the crack initiated at the point. And the crack propagated by the high cycle fatigue and fractured finally. This paper describes the root cause analysis and countermeasures for the gas turbine compressor blade damage of the cogeneration plant.
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송기욱(Gee Wook Song),최우성(Woo Sung Choi),김완재(Wanjae Kim),정남근(Nam Gun Jung) 대한기계학회 2013 大韓機械學會論文集B Vol.37 No.12
증기터빈의 터빈 블레이드는 발전소 핵심설비 중 하나로, 로터의 디스크에 결합되어 회전함으로써 증기 에너지를 기계적 에너지로 변환시켜주는 역할을 하고 있다. 최근 터빈의 잦은 기동정지로 인해 블레이드 회전에 따른 원심하중이 반복적 작용하고 이에 따른 저압 증기터빈 최종단 블레이드의 손상이 자주 보고되고 있다. 본 논문에서는 터빈 블레이드에 발생되는 손상을 분석하여 블레이드에 발생되는 저주기 피로수명을 평가하였다. 증기터빈 최종단 블레이드의 균열발생 수명을 결정하기 위해 유한요소법으로 계산한 탄성응력에 Neuber’s rule을 적용하여 진변형율 진폭을 계산하였으며, 예측된 수명과 블레이드 실제 기동정지횟수가 잘 일치됨을 보였다. A steam turbine blade is one of the core parts in a power plant. It transforms steam energy into mechanical energy. It is installed on the rim of a rotor disk. Many failure cases have been reported at the final stage blades of a low-pressure (LP) turbine that is cyclically loaded by centrifugal force because of the repeated startups of the turbine. Therefore, to ensure the safety of an LP steam turbine blade, it is necessary to investigate the fatigue strength and life. In this study, the low cycle fatigue life of an LP steam turbine blade is evaluated based on actual damage analysis. To determine the crack initiation life of the final stage of a steam turbine, Neuber’s rule is applied to elastic stresses by the finite element method to calculate the true strain amplitude. It is observed that the expected life and actual number of starts/stops of the blade were well matched.
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