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비파괴평가기술을 이용한 유리기지 복합재료의 손상 모니터
김정국(Jeongguk Kim),백광선(Kwangsun Baik),김원경(Weon-Kyong Kim) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
Two types of nondestructive evaluation (NDE) methods, such as infrared (IR) thermography and acoustic emission (AE) techniques, were used for the damage analyses during tensile testing of Nextel fiber reinforced Blackglas matrix composites. During tensile testing, AE sensors and an IR camera were used for in-situ monitoring of the progressive damages of the samples. AE provided the amounts of damage evolution in terms of the AE intensity and/or energy, and the IR camera was used to obtain the temperature changes during the test. Microstructural characterization using scanning electron microscopy (SEM) was performed to investigate the fracture mechanisms and modes of Nextel/Blackglas samples. Moreover, SEM characterization results provided the substantial evidence of failure behavior, and showed comparable results with NDE signatures.
류준형(Joonhyoung Ryu),배창한(Changhan Bae),백광선(Kwangsun Baik),이강원(Kangwon Lee),김재원(Jaewon Kim),지해영(Haeyoung Ji) 한국철도학회 2014 한국철도학회 학술발표대회논문집 Vol.2014 No.10
철도차량에는 역행과 제동을 위하여 추진제어용 전력변환장치와 견인전동기로 구성되는 추진제어장치가 설치되어 있는데, 제어특성에 따라 특유의 스위칭 소음이 발생된다. 국내에서 운영되는 철도차량의 추진제어장치는 관련법령에 따라 소음기준에 적합하도록 제작되어야 하는데, 추진제어용 전력변환장치의 소음시험은 구성품 단계에서 견인전동기와 조합하여 운전상태를 변화시키며 발생소음이 최대인 운전상태에서 측정한다. 소음수준은 운전조건과 부하조건 등에 따라 달라지며, 측정위치에 대해서도 영향을 받는다. 본 논문에서는 운전조건에 따른 추진제어용 전력변환장치의 소음수준 변화와 주파수분석을 통하여 견인전동기 속도에 따른 주파수 분포 추이를 분석한다. In the rolling stock, there is a propulsion control unit which is consisted of traction converter and traction motor for powering and braking. It makes the typical switching noise according to the control characteristics. The propulsion control unit installed in domestic rolling stock should be suitable for related regulation. The noise test for traction converter is performed in sub-system phase which is combined to the traction motor and operated with variable powering command. The noise test results are obtained entire speed range operation from maximum equivalent noise level. The equivalent noise level is changed according to the operation mode, load condition and position of the test. This paper analyzes the variation of equivalent noise level and noise spectrum according to the operating condition.
조용현(Yong Hyeon Cho),최강윤(Kangyoun Choe),백광선(Kwangsun Baik) 한국철도학회 2001 한국철도학회 학술발표대회논문집 Vol.- No.-
Current collection performance on-line tests for a Korean High Speed Train being developed in G7 project is scheduled to start in June, 2002. In this paper, preparatory efforts for measuring contact forces which is regarded as one of major measuring items in the test are introduced. Specifically speaking, review of frequencies related with contact force fluctuations, brief of contact force measuring algorithm, review of measuring instrument specifications and development of a data acquisition program are presented.