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최만용 ( Choi Man-yong ),김치엽 ( Kim Chi-yeop ),권일범 ( Kwon Il-bum ) 한국구조물진단유지관리공학회 1998 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.2 No.1
The strain pattern was investigated to develop the techniques for monitoring the health status of the steel truss bridge which was scaled down to 1/15 of the real bridge for the laboratory experiments. The damage scenarios were chosen as 8 cases which was included the sound bridge. The strain measured from the bridge showed the complex shape which has the two or more dynamic vibration modes. When the load vehicle was passed the center of the bridge, the strain pattern was picked at that time. The various damage cases were distinguished from each other by the strain patterns.
영상처리기법을 이용한 구조물 균열검출시스템의 특성 및 신뢰성 검증
최만용(Choi Man-Yong),김수언(Kim Su-Un),지기환(Jee Kee-Hwan),신성우(Shin Sung-Woo),박정학(Park Jeong-Hak) 한국구조물진단유지관리학회 2006 한국구조물진단학회 학술발표회논문집 Vol.10 No.1
The investigation of concrete structure typically relies on visual inspection which is one of basic inspection technique. Image processing techniques play a crucial role in the growing field of automatic surface inspection technique. However, kinds of inspection equipment, environmental condition and detection algorithm have much influence on the reliability of inspection result. This paper proposes a verification method and testing procedure for the reliability of inspection results and surveys characteristics of image acquisition systems and crack inspection algorithms.
최만용 ( Choi Man-yong ),권일범 ( Kwon Il-bum ),김치엽 ( Kim Chi-yeop ) 한국구조물진단유지관리공학회 1997 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.1 No.1
강트러스 교량의 손상발생을 검출하기 위한 기법을 실험실 안에서 연구하기 위하여 실교량을 1/15로 축소한 3차원 강트러스 교량을 제작하고 실험하였다. 강교량의 손상시나리오를 6개로 선정하고 동적 유한요소해석을 수행하여 축소모형 강교량의 동적특성을 해석적으로 검토하였다. 축소 모형 강교량은 8개의 베이(bay)를 갖는 단경간의 복사재로 구성하여 설계하고 제작하였다. 이동하 중차량은 서보모터를 사용하여 140Kg의 최대무게 및 최대속도 4m/sec로 가동할 수 있도록 제작하였다. 이동하중차량에 의한 실험결과 가속도계 신호로부터 주파수 스펙트럼이 손상에 따라 크게 변화하는 것을 확인하였다. 따라서 이러한 동적 특성 검출에 의하여 강교량의 붕괴 이전에 손상을 검출할 수 있도록 상시감시할 수 있음을 알 수 있었다.
최만용 ( Choi Man-yong ),오세욱 ( Oh Se-wook ),허광희 ( Heo Gwang-hee ),박정학 ( Park Jeong-hak ) 한국구조물진단유지관리공학회 2000 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.4 No.1
This study deals with earth pressure acting on CIP wall and displacement of CEP wall with excavation. The primary purpose of this study analysis the earth pressure using displacement and strut axial force by the measured and calculated values with excavation step. Also, through the comparative analysis of measured axial forces with load cells and calculated earth pressure with principle virtual work, it is the purpose of this study to obtain the measurement analysis source that could solve problems for the process of the stage excavation. This paper compares measurement results with analysis results on the earth pressure and displacement of the wall and describes more exact earth pressure and the change of the wall displacement of deep excavation.
적외선 열화상 응력측정법에 의한 동적 응력집중계수 예측
최만용(Man Yong Choi),강기수(Ki Soo Kang),박정학(Jeong Hak Park),안병욱(Byung Wook Ahn),김경석(Koung Suk Kim) Korean Society for Precision Engineering 2008 한국정밀공학회지 Vol.25 No.5
Structural components subjected to high frequency vibrations, such as those used in vibrating parts of gas turbine engines, are usually required to avoid resonance frequencies. Generally, the operating frequency is designed at more than resonance frequencies. When a vibrating structure starts or stops, the structure has to pass through a resonance frequency, which results in large stress concentration. This paper presents the transient thermoelastic stress analysis of vibrating cantilever beam using infrared thermography and finite element method (FEM). In FEM, stress concentration factor at the 2nd resonance vibration mode is calculated by the mode superposition method of ANSYS. In experiment, stress distributions are investigated with infrared thermography and dynamic stress concentration factor is estimated. Experimental result is agreed with FEM result within 10.6 %. The advantage of this technique is a better immunity to contact problem and geometric limitation in stress analysis of small or micro structures.
최만용 ( Choi Man-yong ),권일범 ( Kwon Il-bum ) 한국구조물진단유지관리공학회 1998 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.2 No.2
The prototype health monitoring system was constructed to guide the level-up of the bridge management system. The bridge management system should be able to determine the structural health stsatus. However, many present systems used m the real bridges can not automatically determine the health status. In this study, the prototype system was developed to have 4 functions: the real-time abnormal signal detection, the abnormal part detection, the determination of damaged members, and the calculation of residual fatigue life. This prototype system will be modified and verified by the data acquired from the measurements of the real bridges.