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최병근(Byeong-Keun Choi),안병현(Byung-Hyun Ahn),김용휘(Yong-Hwi Kim),이종명(Jong-Myeong Lee),이정훈(Jeong-Hoon Lee) 한국소음진동공학회 2013 한국소음진동공학회 학술대회논문집 Vol.2013 No.10
Acoustic Emission technique is widely applied to develop the early fault detection system, and the problem about a signal processing method for AE signal is mainly focused on. In the signal processing method, envelope analysis is a useful method to evaluate the bearing problems and Wavelet transform is a powerful method to detect faults occurred on rotating machinery. However, exact method for AE signal is not developed yet. Therefore, in this paper two methods which are Hilbert transform and DET for feature extraction. In addition, we evaluate the classification performance with varying the parameter from 2 to 15 for feature selection DET, 0.01 to 1.0 for the RBF kernel function of SVR, and the proposed algorithm achieved 94% classification accuracy with the parameter of the RBF 0.08, 12 feature selection.
일체형 삼점지지 고압 LNG 2차 펌프 rotor의 1차 mode 특성을 고려한 Balancing 벡터선도 연구
최병근(Byeong Keun Choi),박선휘(Sun Hwi Park),하정민(Jeong Min Ha),김효중(Hyo Jung Kim),김학은(Hack Eun Kim) 한국소음진동공학회 2016 한국소음진동공학회 학술대회논문집 Vol.2016 No.4
Balancing of rotating machinery can determines the life of the machine. before further damage occurs. The subject of this paper is a secondary high-pressure LNG Pump. This pump has a long shaft and integral type of rotor. Also, the shaft has three support points. This shape has difficulty correcting the unbalance using the existing two-plane balancing. Therefore balancing technology development is required. It simulated a high-pressure LNG Pump with Rotor and Shaft shape of the subject integrated using Pilot Rotor as previous studies to determine the optimal balancing rpm of the Lab Scale Shaft. By carrying out balancing at each rpm, we compared the amplitude, drew the graph and compared every aspect resulted from balancing at each rpm. Then, we check which rpm the most advantageous balancing occurs at.