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가변 조건 유성기어 고장 진단 알고리즘의 신호처리 방법에 따른 성능 비교 연구
윤명백(Myeongbaek Youn),박정호(Jungho Park),윤병동(Byeng Dong Youn) 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.12
Lots of studies have been conducted for fault detection of planetary gears under assumptions of constant speed conditions. However, they could not be applicable to planetary gears in real world systems where they are operated under non-stationary conditions. Recently, a positive energy residual (PER) method was proposed for fault detection of planetary gears under non-stationary conditions. In the method, wavelet transform was used to extract fault-relevant features from vibration signals. Although the method showed good fault detection performance, fault sensitivity of the PER method could depends on types of faults and basis function. In this study, we investigate the effect of the PER method under variable conditions of wavelet transform on the fault detection performance. In addition, we evaluate the fault detection performance when other time-frequency analyses are used for the PER method. User changeable factors, especially types of signal processing and its parameters, are confused to compare PER performances.
표면 부착형 영구자석 전동기의 권선단락고장 센서리스 진단
안길준(Giljun Ahn),이준민(Junmin Lee),박찬희(Chan Hee Park),윤명백(Myeongbaek Youn),윤병동(Byeng D. Youn) 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.12
Surface-mounted permanent magnet synchronous motors (SPMSMs) are widely used in high precision control systems such as industrial robots. If inter-turn faults of SPMSM were not early detected, it may cause enormous financial loss. This study deals with the analysis of low severity level faults of SPMSM with various load condition. The mathematical model of SPMSM with low severity inter-turn faults is established and simulated. From the simulation results, the possibility of shorted circuit current as a fault indicator indicating the severity of fault was confirmed. Not only confirm the possibility, this study suggests the method to estimate the fault indicator without additional sensor such as accelerometer or voltage probe. The simulation of proposed method was conducted and the simulation results verify the effectiveness of proposed method as well.