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장정환,이정휘,김성곤,장승필,Jang, Jeong Hwan,Lee, Jung Whee,Kim, Sung Kon,Chang, Sung Pil 한국강구조학회 1997 韓國鋼構造學會 論文集 Vol.9 No.4
모달실험 기법의 강부재 손상발견 적용성에 대한 실험적 연구를 수행하였다. 단경간 및 2경간 강재보에 손상을 모사한 단계적인 절단을 가하면서 모달실험을 반복하고, 손상 정도에 따른 모달 파라미터의 변화를 관찰하였으며, 실험 결과를 검증할 목적으로 수치해석을 병행하였다. 고려한 모달 파라미터는 고유진동수(Frequency), 변위 모드형상(Displacement Mode Shape), 변형률 모드형상(Strain Mode Shape)이며, 이들 모달 파라미터를 구하기 위하여 가속도계와 변형률계를 사용한 모달실험을 실시하였다. 각각의 손상단계에서 손상에 의한 변위 모드형상과 변형률 모드형상의 변화를 위치에 대해 정량적으로 나타내기 위하여, CoMAC과 Modal Vector Error를 사용하였다. 고유진동수는 손상의 정도가 심해짐에 따라 감소하는 경향을 보였으며, 손상의 위치를 발견하는 데에 가장 효과적으로 사용될 수 있는 것은 변형률 모드형상이었다. A series of experimental tests have been performed on a tube beam in which artificial damage is applied in order to address damage detectability using modal analysis. Modal parameters considered are frequency, displacement mode shape and strain mode shape CoMAC(Coordinate Modal Assurance Criterion) and Modal Vector Error have been adopted for presenting the change of displacement mode shape and strain mode shape. It is revealed strain mode shape is the most sensitive to damage.
3D 객체 모델을 활용한 점검 정보입력 및 표출에 관한 연구
장정환,안호현,박상덕,강동현,Jang, Jeong-Hwan,An, Ho-Hyun,Park, Sang Deok,Kang, Dong-Hyun 한국BIM학회 2013 KIBIM Magazine Vol.3 No.3
In general, a two-dimensional platform were used to manage the structural inspection information. But we performed a study on utilizing 3D model to input and display the information of structure inspection. Coarse and Fine model of structure were used to input the information. 3D model combined with database built from record plan and field inspections data and rating will provide more intuitive and effective environment for inspectors in bridge maintenance.
장정환(Jeong-Hwan Jang),허철수(Zhezhu Xu),김해지(Hae-Ji Kim),김남경(Nam-Kyung Kim),류성기(Sung-Ki Lyu) 한국기계가공학회 2011 한국기계가공학회지 Vol.10 No.2
The purpose of this study is to show the friction and wear characteristics on the vapor deposited coating layers on the SCM415 steel. In this research, frictional wear characteristic of coating materials such as Ti-series, Cr-series & WC/C and TiAlN+WC/C multilayer coating was investigated under room temperature, normal air pressure and no lubricating condition. Therefore, this study carried out research on the friction coefficient, micro hardness(Hv), surface roughness and wear quantity on the vapor deposited coating layers on the SCM415 steel. As the wear experimental result, the excellence of TiAlN+WC/C multilayer coating has been proven by high micro-hardness, low friction coefficient and wear quantity.
TiN과 TiCN 코팅층의 마찰ㆍ마모 특성에 관한 연구
장정환(Jeong-Hwan Jang),탁성훈(Sung-Hoon Tag),장기(Qi Zhang),구재준(Jai-Jun Koo),류성기(SungKi Lyu) 한국기계가공학회 2009 한국기계가공학회 춘추계학술대회 논문집 Vol.2009 No.6월
The purpose of this study is to show the friction and wear characteristics on the vapor deposited coation layers on the SCM415 steel. In this research, frictional wear characteristic of coating materials such as TiN, TiCN was investigated under room temperature, normal air pressure and nothing lubrication condition. Therefore this study carried out research on the friction coefficient, micro hardness(Hv), roughness, SEM on the vapor deposited coating layers on the SCM415 steel.
Ti-계 코팅이 SCM415강의 마찰ㆍ마모 특성에 미치는 영향
장정환(Jeong-Hwan Jang),탁성훈(Sunghoon Tak),장기(Qi Zhang),허철수(Zhezhu Xu),류성기(Sungki Lyu) 한국트라이볼로지학회 2010 한국윤활학회지(윤활학회지) Vol.26 No.3
The purpose of this study is to show the friction and wear characteristics on the vapor deposited Ti-series coating layers on the SCM415 steel. In this research, frictional wear characteristic of coating materials such as TiN, TiCN, TiAlN was investigated under room temperature, normal air pressure and dry lubricating condition. Therefore this study carried out research on the friction coefficient, micro hardness(Hv), roughness, SEM on the vapor deposited coating layers on the SCM415 steel.