Effect of Dynamic Properties of Support O-Rings on Stability of Herringbone-Grooved Aerodynamic Journal Bearings

Abstract

This paper discusses the stability of herringbone-grooved aerodynamic journal bearings supported by rubber O-rings. In this research, the dynamic stiffness and the damping properties of the O-rings are identified in a variety of operating and design conditions. The identification results are fitted with the empirical formulae previously proposed, and the distributions of the dynamic properties in a variety of support conditions are obtained. It is theoretically investigated how the stability of the bearing system changes with the dynamic properties. The bearing tests are also performed to verify the analytical results with the empirical formulae. The empirical formulae used here was reasonable for simulating the dynamic properties of the O-rings in a variety of bearing support conditions. The comparisons between the analysis and experiments verified the effectively of analyzing the stability of the bearing system by using the empirical formulae.

Effect of Internal Structure of Circular Dimples on Hydrodynamic Lubrication Characteristics of Thrust Bearings

“…The error bars indicate the standard deviation. The theoretical value shows the calculation result for the plane (dimple-free) bearing, which can be obtained using Formula (11).…”

“…These publications commonly RESEARCH note that the ability of dimples to provide the LCC has a strong influence on the lubrication characteristics. Since the pioneering works by Etsion et al [6], texturing has attracted attention for improving the lubrication performance of machine elements [7][8][9][10][11][12][13][14]. Many researchers attempted to provide optimal designs for fully and partially textured bearings in analysis based on the Reynolds equation or the Navier-Stokes equation [15][16][17].…”

Appearance of Hysteresis Phenomena on Hydrodynamic Lubrication in a Seal-Type Thrust Bearing with Dimples

“…Applying dimples and/or grooves to the lubricating area is an effective method for improving lubrication performance [1]. Consequently, this technology is being used in various mechanical elements such as bearings [2][3][4][5], seals [6][7][8], and piston rings [9,10].…”

Hysteresis Phenomenon of Hydrodynamic Lubrication Characteristics of Seal-Type Dimple Bearings

“…Surface texturing is a technology for improving tribological characteristics by creating patterns such as dimples [1] and grooves [2] on lubricating surfaces. Experimental and theoretical studies for making clear the effective geometric parameters of textured surfaces have been conducted from various viewpoints [3][4][5].…”