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원전격납건물 계측용 광섬유 FBG 센서 패키지의 보정 방법
조명석 ( Cho Myung-seok ),김종우 ( Kim Jong-woo ),윤덕중 ( Yun Deok-jung ) 한국구조물진단유지관리공학회 2007 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.11 No.2
Optical fiber FBG(Fiber Bragg Grating) sensors are able to measure small deformations, caused by external forces, by measuring the reflected wave-length of the FBGs. But as a specific character optical fibers are brittle and infirm of tensile forces. So we need to design a device for protecting the optical fibers in long distance measurements. In this paper we suggested a sensor package using FBG sensors. Eventually to measure the behaviors of the Containment Structure of Nuclear power plants during the pressurizing for the Structural Intetgrity Test(SIT). This is to alternate the existing method using invar wires. Because of the low accuracy from it’s self weight and occur of electric noise in the existing methods. As a result, to ensure reliability of the sensor package we performed a displacement control and temperature variation test. From these test results we obtained the correction method of the suggested FBG sensor packages.
장광석(Kwang-Seok Jang),심기철(Ki-Chul Sim),이재욱(Jae-Uk Lee),이홍표(Hong-Pyo Lee),조명석(Myung-Suk Cho) 한국소음진동공학회 2015 한국소음진동공학회 학술대회논문집 Vol.2015 No.4
The purpose of this study is to reduce the quantities of the isolators for optimization of nuclear power plants base isolation system. To solve this problem, increase the horizontal stiffness of the device over the performance improvement of the existing low hardness rubber, and decreases the quantity of devices through the division of lead-core. In order to optimize the APR1400’s base isolation system, finite element analysis was performed to examine the multi-lead rubber bearing which is improved the single lead rubber bearing. The proposed division of lead plug can reduce the quantity of devices through in this study. Accordingly possible to secure economic efficiency of the seismic isolation system, and is also expected to be effectively managed in the maintenance.
우상균 ( Woo Sang-kyun ),이홍표 ( Lee Hong-pyo ),송영철 ( Song Young-chul ),조명석 ( Cho Myung-seok ) 한국구조물진단유지관리공학회 2007 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.11 No.2
In this paper the characterization test for bond performance of CFRP plate was conducted, and based on its results, a new bond-slip model was proposed. The experiment results showed that as bond length and width of CFRP plate increased, its fracture load increased, but the increase also showed a tendency to reduce average bond stress due to the increase in bond surface. Also, as bond length and width increased, the strain of CFRP plate increased, but unlike bond length, increase in bond width was shown to reduce maximum bond stress. Among the test variables, as concrete strength increased in comparison to CFRP plate's bond length and width, fracture load and average bond stress showed tendency to increase, but the effect was revealed to be not significant. Also, as bond length increased, bond stress concentration was transmitted to the end parts of the CFRP plate, and as bond width increased, bond stress showed a tendency to uniformly spread along the bond surface. Based on the results of the bond experiment, a bilinear function was introduced to the ascending section and an exponential function was introduced to the descending section in correlating shear stress and slip in the bond-slip model, and a new bond-slip model was proposed that can effectively be applied to the analysis of boundary surface behavior between concrete and CFRP plates.