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공동주택 층간소음 저감을 위한 능동소음제어(ANC) 기술 적용가능성 분석
남진원,김호진,김준환,위혁,김중관,Nam, Jin-Won,Kim, Ho-Jin,Kim, Jun-Hwan,Wee, Hyuk,Kim, Joong-Kwan 한국구조물진단유지관리공학회 2022 한국구조물진단유지관리공학회 논문집 Vol.26 No.5
In this study, numerical simulations for reducing noise between floors in an apartment building was carried out using Active Noise Control (ANC) technology. In order to examine the feasibility of using ANC to reduce noise between floors, accelerometers and microphones for noise collection were installed in the inter-floor noise test facility to measure noise and vibration caused by the impact ball drop test. By using the measured data, Filtered-x Least Mean Square (Fx-LMS) algorithm-based ANC simulations were carried out. In the simulations, after deriving optimal simulation conditions including the adaptive control convergence coefficient, the noise reduction effect was analyzed through numerical simulations using the number of installed accelerometers and speakers as variables. Finally, it was confirmed that the noise between floors could be reduced using ANC technology under limited conditions.
사면붕괴 모니터링에 사용되는 온도-함수비 복합계측시스템 개발에 관한 실험적 연구
남진원 한국구조물진단유지관리공학회 2015 한국구조물진단유지관리공학회 논문집 Vol.19 No.2
Recently, the event of slope failure has been occurring frequently due to rapid climate changes and broad development of infrastructures, and the research for establishment of monitoring and prevention system has been an attentive issue. The major influence factors of slope failure mechanism can be considered moisture and temperature in soil, and the slope failure can be monitored and predicted through the trend of moisture-temperature change. Therefore, the combined sensing technology for the continuous measurement of moisture-temperature with different soil depths is needed for the slope monitoring system. The various independent sensors for each item (i.e. temperature and moisture respectively) have been developed, however, the research for development of combined sensing system has been hardly carried out. In this study, the high-fidelity sensor combing temperature-moisture measurement by using the minimized current consuming temperature circuit and the microwave emission moisture sensor is developed and applied on the slope failure monitoring system. The feasibility of developed monitoring system is verified by various experimental approaches such as standard performance test, mockup test and long-term field test. As a result, the developed temperature-moisture combined measurement system is verified to be measuring and monitoring the temperature and moisture in soil accurately.
남진원 한국구조물진단유지관리공학회 2019 한국구조물진단유지관리공학회 논문집 Vol.23 No.3
Recently, precast PSC girder bridges have been widely applied for short and middle span bridges. The construction of the spliced girder bridges has been increasing to overcome the length limit of girder and transportation restrictions. In case of the spliced girder, the integrity of the segmental joints is very important to secure the structural soundness of bridge because the discontinuity on the segmental joints between adjacent segments could be vulnerable point. The study of segmental joint behavior with different influence factors of joint type, shear key installation, confining force is very important. In this research, finite element analysis and scaled model test with different shear key shapes and confining forces were carried out and the comparative study was performed to evaluate the segmental joint behavior of precast spliced PSC girder bridge. It was confirmed that the installation of shear key with height and depth ratio of 1/2~1/3 and applying of confining force of 1/2 of the concrete strength at the joint was effective in improving the integrity of segmental joint. In addition, the field loading test for existed precast spliced PSC girder bridge was performed and the measurement of the difference of deflection between adjacent segments at segmental joint was proposed as the assessment solution of the integrity of segmental joint. 최근 프리캐스트 PSC 거더 형식의 교량이 널리 시공되고 있으며, 거더의 경간과 운송제한을 극복하기 위하여 분절거더의 시공이 증가하고 있다. 분절 공법을 적용한 세그먼트 간의 접합면에는 불연속면이 존재할 수 있으므로 교량의 건전성에 있어 접합부의 일체거동이 매우 중요하다. 분절 접합부는 접합부의 형태, 전단키 유무, 구속력의 크기에 따라 거동차이를 보이기 때문에 이러한 영향인자를 변수로 한 접합부 거동 연구가 필요하다. 본 연구에서는 프리캐스트 PSC 거더교의 접합부 거동을 평가하기 위하여 전단키의 형상, 구속력 도입여부를 변수로 한 전단키 유한요소해석과 축소모형시험을 실시하고, 그 결과를 비교하여 전단키와 구속력 효과를 평가하였으며, 접합부에 1/2~1/3의 돌출높이비를 갖는 전단키를 설치하고 콘크리트 강도의 1/2 수준의 구속력을 도입하는 것이 분절 접합부 거동향상에 효과적이라는 것을 확인하였다. 또한, 분절 공법으로 시공된 실제 프리캐스트 PSC 거더 교량의 재하시험을 실시하고 접합부 세그먼트 간의 처짐차이를 측정하여 분절부 거동을 평가하는 방법을 제안하였다.
남진원,김장호,김성배,이나현,변근주 대한토목학회 2008 KSCE Journal of Civil Engineering Vol.12 No.4
Accurate computational blast analysis can be an effective replacement for costly blast field test. HFPB (high fidelity physics based)blast analysis method including high strain rate dependent material models and appropriate blast wave models is a representativeprecise blast analysis method. HFPB blast analysis method can be used for various analyses such as structural analysis, retrofittingdesign analysis, fragmentation analysis, and energy absorbing analysis. When analyzing the behaviour of structure under blastloading by HFPB finite element methods, load gradient differences occurs dependent on the mesh size. This causes gaps between theexplosive energy and internal energy of structures and the results of analysis become mesh-size-dependent. In this study, theanalytical considerations were presented for mesh sensitivity due to non-uniform pressure load distribution on the structure subjectedto blast wave of high explosive with relatively close stand-off. Through the analysis results, the maximum element size whichensures the mesh-size independent analysis results is suggested.
Numerical evaluation of FRP composite retrofitted reinforced concrete wall subjected to blast load
남진원,윤인석,이성태 사단법인 한국계산역학회 2016 Computers and Concrete, An International Journal Vol.17 No.2
High performance materials such as Fiber Reinforced Plastic (FRP) are often used for retrofitting structures against blast loads due to its ductility and strength. The effectiveness of retrofit materials needs to be precisely evaluated for the retrofitting design based on the dynamic material responses under blast loads. In this study, the blast resistance of Carbon Fiber Reinforced Plastic (CFRP) and Kevlar/Glass hybrid fabric (K/G) retrofitted reinforced concrete (RC) wall is analyzed by using the explicit analysis code LS-DYNA, which accommodates the high-strain rate dependent material models. Also, the retrofit effectiveness of FRP fabrics is evaluated by comparing the analysis results for non-retrofitted and retrofitted walls. The verification of the analysis is performed through comparisons with the previous experimental results.