多孔質動圧ジャーナル軸受における非定常時潤滑特性の実験的研究（ピボット支持における回転数勾配をパラメータとした周波数分析による軸心挙動の検討）

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  • Experimental Study on the Lubrication Characteristics of Porous Journal Bearings with Hydrodynamic Shape Forming at Annular Surface under Shaft Unsteady Condition (Examination into the Whirling Behavior of Shaft at Pivot Supported Condition by Analyzing the Frequency Spectrum of Time History Waveform with Parameter of Gradient on Starting Revolution Speed Changes)

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This report is described the examination of some hydrodynamic shapes formed at the annular surface of oil impregnated sintered porous bearing as DC spindle motor's bearing system. Herring Bone (I&II), Three Lobed Type or Sleeve as a radial hydrodynamic shape were proposed, and four kinds of specimens were produced as a porous journal bearing. It was examined experimentally to optimize the hydrodynamic shape of porous journal bearing with pivot supported condition by measuring the lubrication characteristics. This research report is especially referred the experimental examination for Settling Time, Lissajous Curve diagram or Shaft Whirling Behavior by measuring the Time History Waveform of shaft such as above mentioned lubrication characteristics under shaft unsteady condition. Furthermore, in this report, it is investigated to discuss the influences of diametral clearance change and gradient on starting revolution speed change to the lubrication characteristics by measuring the Time History Waveform of shaft under the same condition. In addition, in order to investigate more detailed rotating behavior of shaft, authors practice the Frequency Spectrum Analysis of Time History Waveform with FFT.

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