Experimental study on the lubrication characteristics of porous circular journal bearing under shaft unsteady condition (Examination into the whirling behavior of shaft at pivot supported condition by measuring the time history waveform of shaft with parameter of diametral clearance changes)

Abstract

This report is described the study on the lubrication characteristics of porous circular journal bearing made with oil impregnate sintered materials as a DC spindle motor's bearing system. It was examined experimentally to optimize the diametral clearance of porous journal bearing with pivot supported condition by measuring the lubrication characteristics. In this report, it 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 starting condition. Furthermore, it was investigated to discuss the influences of diametral clearance changes to the lubrication characteristics by measuring the Time History Waveform of shaft under same condition. In addition, in order to investigate more detailed rotating behavior of shaft, authors practiced the Frequency Spectrum Analysis of Time History Waveform with FFT.