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진동 신호의 방향 파워 스펙트럼을 이용한 엔진의 이상 폭팔 진단
이종원(Chong-WonLee),한윤식(Yun-Sik Han),한우섭(Woo-Sup Han) 한국자동차공학회 1993 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
A new signal processing technique is applied to four-cylinder compression ignition engine for the diagnosis of power faults inside the cylinders. This technique utilizes two-sided directional power spectra (dPS) of complex vibration signals measured from engine blocks as the patterns for engine cylinder power faults. The dPSs feature that they give not only the frequency contents but also the directivity of the engine block motion. For the automatic detection / diagnosis of cylinder power faults, pattern recognition method using multi-layer neural networks is employed. Experimental results show that the success rate for diagnosis of cylinder power faults using dPSs is higher than that using the conventional one-sided power spectra. The proposed technique is also tested to check the robustness In the sensor position and the engine rotational speed.<br/>
고정자의 유연성을 고려한 유체베어링 지지 HDD 스핀들 계의 진동해석
임승철(Lim, Seungchul),전상복(Chun, Sang-Bok),한윤식(Han, Yun-Sik),이호성(Lee, Ho-Seong),김철순(Kim, Cheol-Soon) 한국소음진동공학회 2005 한국소음진동공학회 논문집 Vol.15 No.6
This paper presents vibration analyses of hard disk drive (HDD) spindle systems based on the finite element method. The systems under investigation have a cantilevered shaft rotating on hydrodynamic bearings. In particular, the influence of stator's flexibility on major modes has been taken into account in dual ways lumped and distributed-parameter model approfches. Even the latter employs relatively macroscopic elements instead of extremely fine ones Popular in commercial codes. In order to prove the effectiveness of such formulated models, two types of HDD prototypes featuring different hub and stator structures are selected as examples. Compared to the first, the second type has a reinforced stator that would raise the natural frequency of the hub's translational (or sideway) mode. Both free and forced vibration characteristics are computed, and subsequently compared with the experimental data. It is our conclusion that Particularly the Proposed distributed model method is an efficient design tool for state-of-the-art HDD spindle systems.