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최종현(Jonghyun Choi),박종민(Jonmin Park),김근수(Keunsu Kim),김수지(S.J Kim),정화용(Hwayong Jung),윤병동(Byeng D. Youn) 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.12
Envelope analysis is most conventionally used for detection of rolling element bearing faults by bandpass filtering the raw signal and then extracting its envelope and then analyzing fault frequency energy by Fourier transform. However, traditional Envelope analysis based algorithm such as high frequency resonance technique and spectral kurtosis has limitation in extracting faulty signal and constructing optimal bandpass-filter. This paper employs empirical mode decomposition(EMD) to decompose signal and sort fault implemented signal and particle swarm optimization(PSO)to optimize bandpass filter. The performance of “EMD+PSO Envelope analysis” was checked under varying fault location and load condition by CWRU data, and varying operating speed and fault size by SNU data. It was shown that suggested algorithm successfully diagnose four commonly occur bearing fault location and also naturally formed distributed fault under different speed and loading condition. It was also shown that suggested algorithm presents much higher performance compare to three previously introduced Envelope analysis algorithm.
오세웅(Sewoong Oh),박종민(Jonmin Park),서기열(Kiyeol Seo),서상현(Sanghyun Suh),이기철(Kichul Lee) 한국항해항만학회 2007 한국항해항만학회 학술대회논문집 Vol.2 No.추계
국제수로기구인 IHO는 수로국 간 수로데이터를 교환하거나 항해장비 생산자, 항해자, 기타 사용자에게 수로데이터를 공급하기 위해 수로데이터 교환표준인 S-57 표준을 개발하였다. IHO는 S-57 표준을 수로분야 범용 표준으로 만들었으나 ECDIS의 베이스맵으로 사용되는 전자해도 제작에만 한정되어 사용되어 왔다. 이를 개선하고자 IHO는 육상GIS의 ISO/TC 211의 1900 시리즈 표준을 적극 수용하여 S-100 표준을 개발 중에 있다. S-100 표준은 항해장비 및 해양정보시스템 등 크게 영향을 미칠 것으로 예상되는 바, 본 연구에서는 S-100 수로데이터 개발방법을 정리하고 이를 적용한 수로데이터 제작방안을 제시한다. IHO S-57 is the standard intended to be used for the exchange of digital hydrographic data between hydrographic offices, and for the distribution of hydrographic data to manufacturers, mariners and other data users. But it was primarily developed to meet the ENC requirement called for in an IMO-compliant ECDlS. As presently structured, it cannot support future requirements such as gridded bathymetry or time-varying information To improve this limitations, IHO is developing new digital hydrographic standard, S-100. In this paper, we analyze the S-100 standards and propose the method for development of digital hydrographic data according to S-100.