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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.
RC 고형 거더교의 내하력 평가를 위한 재하시험과 Proof Load Test
정대성 ( Jung Dae-sung ),최정길 ( Choi Jung-gil ),장정환 ( Jang Jeong-hwan ),김철영 ( Kim Chul-young ) 한국구조물진단유지관리공학회 2008 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.12 No.1
The purpose of this study is to provide a basic data to evaluate realistic load-carrying capacity of bridges by load test. The conventional diagnostic load test, resonance test, and proof load test were carried out on the Ssanggye-1 bridge (RC T-girder bridge). In this paper, general description of test procedure and results are described. More detailed analysis will be followed by other participants of this project.
스마트폰 센서 데이터를 이용한 실내 응급대피용 위치 추정 연구
전욱,장정환,진혜명,조용철,이창호,Quan, Yu,Jang, Jung-Hwan,Jin, Hye-Myeong,Jho, Yong-Chul,Lee, Chang-Ho 대한안전경영과학회 2019 대한안전경영과학회지 Vol.21 No.4
The LBS(Location Based Service) technology plays an important role in reducing wastes of time, losses of human lives and economic losses by detecting the user's location in order by suggesting the optimal evacuation route of the users in case of safety accidents. We developed an algorithm to estimate indoor location, movement path and indoor location changes of smart phone users based on the built-in sensors of smartphones and the dead-reckoning algorithm for pedestrians without a connection with smart devices such as Wi-Fi and Bluetooth. Furthermore, seven different indoor movement scenarios were selected to measure the performance of this algorithm and the accuracy of the indoor location estimation was measured by comparing the actual movement route and the algorithm results of the experimenter(pedestrian) who performed the indoor movement. The experimental result showed that this algorithm had an average accuracy of 95.0%.
회전형 이상 횡자속형 전동기에서 발생하는 자기력 및 토크 해석
박남기(Park, Nam-Ki),장정환(Chang, Jung-Hwan),장건희(Jang, Gun-Hee) 한국소음진동공학회 2007 한국소음진동공학회 논문집 Vol.17 No.1
Rotatory two-phase transverse flux machine(TFM) is a relatively new type of motor with high power density, high torque, and low speed in comparison to conventional electrical motors. However, it has some shortcomings,.i.e. complex construction and high possibility of the magnetically induced nitration due to its inherent structure. This Paper investigates the characteristics of the magnetic force and the torque in the rotatory two-phase TFM by using the 3-D finite element method and the spectral analysis. This research shows that the average torque decreases and that the torque ripple increases as the phase delay increases. It also shows that the unbalanced magnetic force is one of the dominant excitation forces in this machine. And it proposes a new topology of rotatory two-phase TFM to eliminate the unbalanced magnetic force.