Characteristics of Powder Lubricated Finite-Width Journal Bearings: A Hydrodynamic Analysis

Abstract

In this paper, the average lubrication equation for grain flow is solved using a control volume method to analyze the performance of hydrodynamic journal bearings. The grain particle size effect was investigated. The nondimensional load and friction coefficient are demonstrated in terms of eccentricity ratios under various diameter-to-width ratios. The results demonstrate the performance of powdered lubricated journal bearings, and also accord with the results experimented by Heshmat and Brewe.

Stability of rotor supported on powder lubricated journal bearings with surface pockets

“…The dynamic characteristics of a powder lubricated journal bearing with pockets of rectangular, trapezoidal, elliptical, and parabolic shapes on the bearing bore surface is investigated for the data listed in Table 1. To validate the correctness of present results, the values of coefficient of friction are compared with the published results of Tsai and Jeng 19 which is shown in Figure 5. The comparison shows that results are in close approximation with the published work of Tsai and Jeng.…”

“…The authors have utilized the grain theory proposed by Haff 14 in their derivation. In another work by the authors in ref., 19 they solved the average lubrication equation using control volume method, for the analysis of finite width journal bearing. The grain characteristics, including the particle size and the grain-grain collision inelasticity were investigated.…”

Static and dynamic performance characteristics of powder lubricated symmetrical three-lobed bearing

“…First numerical investigation of granular lubrication in circular journal bearing was done by Tsai and Jeng. 16 They determined the static characteristics of circular journal bearing using Haff 11 model and validated the results with experimental results of Heshmat and Brew. 7,8 The dynamic behaviour of rotors supported on powder-lubricated bearings must be analysed since the stability of rotors against self-excited vibrations could be determined by obtaining the critical speed which in turn depends on the bearing coefficients.…”

“…14 The characteristics of journal bearing lubricated with granular particles were studied by Tsai and Jeng. 15,16…”

“…14 The characteristics of journal bearing lubricated with granular particles were studied by Tsai and Jeng. 15,16 The flow behavior of powder lubricants was studied by Zhou and Khonsari 17 by developing a mathematical model. 18 They studied the lubrication mechanism occurring between two parallel plates.…”