A Study of High Speed Hydrostatic Bearings : Part 1, Theoretical Analysis of Static and Dynamic Characteristics of Hybrid Plain Journal Bearings

Abstract

This paper presents a theoretical analysis of a hybrid plain journal bearing with many capillary-restrictors for high speed and heavy load. When solving the Reynolds equation for the bearing, a difficulty arises in prescribing the boundary condition at the feeding position, where the flow of a fluid is very complicated. In order to remove the difficulty, a row of the feeding holes is replaced by a band source distributed continuously in the circumferential direction, and the restricting effect is simply expressed by constructing flow models in the vicinity of a restrictor. Using these replacement and expression, the boundary condition is given in simple form to make the analysis easy. From the obtained solutions, the statics characteristics such as the load carrying capacity, the journal-center locus and the flow rate, and the dynamic ones such as the spring and damping coefficients and the whirl instability are clarified.