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이상국(Sang-Guk Lee),이선기(Sun-Ki Lee),이준신(Jun-Shin Lee),이욱륜(Wook Ryun Lee) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.11
The objective this study is to estimate the feasibility of acoustic emission method for the internal leak from the valves in nuclear power plants. From the experimental results, it was suggested that the acoustic emission method for monitoring of leak was feasible. When the background levels are higher than the acoustic signals from leak, we can detect the leak analyzing the spectrum of the remainders which take the background noise from the acoustic signals.
초음파를 이용한 발전용 회전기기 베어링 손상상태 평가 연구
이상국(Sang-Guk Lee),이선기(Sun-Ki Lee),이도환(Do-Hwan Lee),박성근(Sung-Keun Park) 대한기계학회 2008 大韓機械學會論文集A Vol.32 No.7
For the purpose of monitoring by ultrasonic test of the ball bearing conditions in rotating machinery, a system for their diagnosis was developed. ultrasonic technique is used to detect abnormal conditions in the bearing system. And various data such as frequency spectrum, energy and amplitude of ultrasonic signals, and ultrasonic parameters were acquired during experiments with the simulated ball bearing system. Based on the above results and practical application for power plant, algorithms and judgement criteria for diagnosis system was established. Bearing diagnosis system is composed of four parts as follows : sensing part for ultrasonic sensor and preamplifier, signal processing part for measuring frequency spectrum, energy and amplitude, interface part for connecting ultrasonic signal to PC using A/D converter, graphic display and software part for display of bearing condition and for managing of diagnosis program.