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비접촉식 진동센서를 통한 균열 모사 실험 시편의 진동 특성에 관한 연구
오홍영(Hong-Young Oh),조선영(Sun-Young Jo),하승우(Seung-Woo Ha),송기오(Ki-O Song),이용구(Yong-Gu Lee),이재민(Jae-Min Lee),손진국(Jin-Guk Son) 대한기계학회 2017 대한기계학회 춘추학술대회 Vol.2017 No.11
Recently, there has been a growing interest in the safety of nuclear power plants after the Fukushima nuclear accident. Most of the nuclear accidents occur in small bore pipe welds. Most of the small bore pipe welds which are dangerous are located in the high radiation exposure area. Therefore, there is a problem that the high radiation exposure of the workers is inevitable at the time of installation and replacement, and the current small bore pipe welds are not monitored. Therefore, in this study, we try to confirm the vibration characteristics according to the depth of cracks in the test piece simulating the small diameter pipe weld. In the experiment, the resonance region of the specimen was changed according to the crack depth. Experimental results show that the resonance region moves uniformly depending on the presence or absence of cracks. However, it was confirmed that it does not vary linearly with the crack depth. In the next study, we try to simulate an actual small diameter welded joint.
수직으로 설치된 비균질 평판 단열재용 성능시험장치 개발
오홍영(Hong Young Oh),송기오(Ki O Song),전현익(Hyun Ik Jeon),조선영(Sun Young Cho) 대한설비공학회 2016 설비공학 논문집 Vol.28 No.4
In case of metal insulation, which is produced by stacking stainless steel sheets and air layers in a multi-stack manner at a specific thickness, insulation performance will be evaluated based on thermal transmittance rather than the intrinsic physical properties of each material such as thermal conductivity. However, there is no standard for measuring thermal transmittance targeted for non-homogeneous insulation which is used in relatively high temperature conditions such as a power station. In this study, the thermal conductivity of homogeneous insulation acquired by the standardized guard hot plate method and the thermal conductivity of homogeneous insulation measured by the newly developed performance tester were compared to verify the confidence level of the tester. As a result, thermal conductivity acquired by the newly developed thermal transmittance tester was about 6% higher than the thermal conductivity measured by the existing guard hot plate method under the anticipated service temperature conditions.