摘要:

As previously reported, an experimental apparatus has been built that allows direct measurement of the journal position in a journal bearing. This paper presents a series of measurements taken with this apparatus using a commercially representative VI (Viscosity Index) improved lubricant and a high molecular weight extremely shear-dependent non-Newtonian lubricant. Measurements are presented for both steady loads and for squeeze flow loads.

ISSN:1040-2004    

DOI:10.1080/10402009208982102

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

摘要:

The pivoted pad journal bearing is a relatively complex assembly since each pad operates under different conditions and deforms by different amounts. A global analysis method is described that includes thermoelastic deformation of the pads and allows the temperature to vary radially and circumferentially in each of the pads and oil films. The analysis includes the calculation of the entry temperature to each pad and convective cooling from the pad surfaces, and is sufficiently compact to fit on a personal computer. The output of the method is compared with five sets of published results for bearings over a range of size and configuration.Presented at the 46th Annual Meeting in Montreal, Quebec, Canada April 29–May 2, 1991

ISSN:1040-2004    

DOI:10.1080/10402009208982103

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

摘要:

Ferrohydrodynamic lubrication in journal bearings by considering cavitation boundary conditions is studied. It is assumed that the magnetization vector is not parallel to the magnetic field vector. Various bearing characteristics have been studied and it is seen that qualitative behavior of these characteristics remains similar to that in the case of non-ferromagnetic fluid. However, a significant quantitative enhancement of these characteristics is observed.Presented at the 46th Annual Meeting in Montreal, Quebec, Canada April 29–May 2, 1991

ISSN:1040-2004    

DOI:10.1080/10402009208982104

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

摘要:

Observed and predicted cavity shapes in a lubricant between two disks are presented. The geometry is similar to that of a thrust bearing or a face seal having non-parallel rotating surfaces. Photographs of cavitated regions are shown and compared with predictions of cavity shapes obtained by an approximate calculation method analogous to the short bearing analysis used for journal bearings. The calculation and the experiment show steady state cavities that are symmetric about the maximum gap thickness. For small angles of disk inclination a single exterior cavity is seen and for larger values of inclination both an interior and an exterior cavity are present. The predicted cavity shape in a given case is a function of the disk inclination, the lower bound pressure for the oil film and rotor speed. General agreement on the cavity shape is obtained between theory and experiment.Presented at the 46th Annual Meeting in Montreal, Quebec, Canada April 29–May 2, 1991

ISSN:1040-2004    

DOI:10.1080/10402009208982105

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

摘要:

An analysis of the transient thermohydrodynamic behavior of the lubricating film in a journal bearing is presented. The energy equation and the Reynolds equation are uncoupled and a simplified form of the energy equation is derived by integrating an assumed form of temperature distribution across the film thickness. This equation gives the mean film temperature subjected to an adiabatic boundary condition at the oil-bush interface and a boundary condition that imposes a uniform circumferential temperature at the oil-shaft interface. An algorithm is developed which efficiently solves the equation for the transient, mean film temperature. Numerical results are presented for several operating parameters.

ISSN:1040-2004    

DOI:10.1080/10402009208982106

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

摘要:

This paper considers friction polymer formation in the parched elastohydrodynamic contacts of instrument ball bearings. The experimental section describes a series of tests intended to isolate operating variables of load, speed and film thickness, and lubricant material variables of species and viscosity, as they influence formation rate. The paper then correlates load, speed and thickness results through the Arrhenius Equation for formation rate.Presented as a Society of Tribologists and Lubrication Engineers paper at the STLE/ASME Tribology Conference in St. Louis, Missouri, October 14–16, 1991

ISSN:1040-2004    

DOI:10.1080/10402009208982107

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

摘要:

The tribochemistry of copper with stearic acid was studied using a pin-on-disc wear tester under boundary lubrication conditions. Wear, as measured by surface profilometry, indicated that stearic acid was able to reduce the wear fourfold. Surface analysis by Fourier Transform Infrared (FTIR) microspectroscopy revealed that cupric stearate was formed during the rubbing process by tribochemical reactions. The reaction product was confirmed by model compounds and was also found to be comparable with those from the static thermal experiments of stearic acid on copper surface at 140°C-160°C. The affinity between the chemisorbed stearic acid and bidentate copper stearate complex is believed to be responsible for the formation of a protective film on the copper surfaces to reduce the wear from further propagation.Presented at the 46th Annual Meeting in Montreal, Quebec, Canada April 29–May 2, 1991

ISSN:1040-2004    

DOI:10.1080/10402009208982108

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

摘要:

Presented at the 46th Annual Meeting in Montreal, Quebec, Canada April 29–May 2, 1991

ISSN:1040-2004    

DOI:10.1080/10402009208982109

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

摘要:

Presented al the 46th Annual Meeting in Montreal, Quebec, Canada April 29–May 2, 1991

ISSN:1040-2004    

DOI:10.1080/10402009208982110

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor