Effect of Supply Oil Quantity on Stability of Oil Film Journal Bearing and Its Hysteresis Characteristics

Abstract

In this paper, the relationship between supply oil quantity and stability of oil film journal bearings are described. Experiments regarding the stability of the journal bearing under vicinity of critical supply oil quantity are conducted. In order to clarify the mechanism of the hysteresis characteristic, the journal lissajous, vibrations and frequencies are measured and the cavitation generated in the bearing clearance were observed. On the other hand, same experiments were conducted regarding inertia effect which appears in case of increasing and decreasing of rotational speed and we compared it with the above experiments. As a result, the different stabilization tendencies were shown between decrease cases of supply oil quantity and rotational speed. From the results of cavitation observation, it is considered that the reason for different stabilization tendency is due to difference of cavitation regions generated in the journal bearing clearance.