Journal articleProceedings of the Institution of Mechanical Engineers Part C Journal of Mechanical Engineering Science · November 1, 2017
Rotating shafts often experience undesirable large-amplitude whirling oscillations associated with resonance at critical speeds. This paper further develops a nondestructive technique in which measured information about the growing nature of the response i ...
Full textCite
Journal articleJournal of Engineering for Gas Turbines and Power · February 1, 2016
The prediction of critical speeds of a rotating shaft is a crucial issue in a variety of industrial applications ranging from turbomachinery to disk storage systems. The modeling and analysis of rotordynamic systems is subject to a number of complications, ...
Full textCite
Journal articleTribology Transactions · 2001
Steady-state cavities in a journal bearing are analyzed in two contexts: first, an approximate thermohydrodynamic theory developed earlier is applied to additional cases, and comparisons are made between temperatures predicted by the theory and measured te ...
Cite
Journal articleProceedings of the ASME Turbo Expo · January 1, 1997
Equations of motion are presented for a two degree of freedom system representing a rotor suspended with an active magnetic bearing. The rotor is subjected to both a rotating unbalance force and a steady load, which is balanced by differential bias in the ...
Full textCite
Journal articleTrans. ASME, J. Eng. Gas Turbines Power (USA) · 1995
This paper describes the results of a study into the dynamic behavior of a magnetic bearing system. The research focuses attention on the influence of nonlinearities on the forced response of a two-degree-of-freedom rotating mass suspended by magnetic bear ...
Cite
Journal articleAmerican Society of Mechanical Engineers Paper · January 1, 1994
This paper describes the results of a study into the dynamic behavior of a magnetic bearing system. The research focuses attention on the influence of nonlinearities on the forced response of a two-degree-of-freedom rotating mass suspended by magnetic bear ...
Cite
Journal articleProceedings of the ASME Turbo Expo · January 1, 1994
This paper describes the results of a study into the dynamic behavior of a magnetic bearing system. The research focuses attention on the influence of nonlinearities on the forced response of a two-degree-of-freedom rotating mass suspended by magnetic bear ...
Full textCite
Journal articleTribology Transactions · January 1, 1992
Two versions of a model for the thermal behavior of the lubricant film in the cavitation region of a journal bearing are presented and incorporated into a solution algorithm for the operating characteristics of an axially grooved bearing. The model is base ...
Full textCite
Journal articleJournal of Tribology, Transactions of the ASME · 1992
Calculations of the forces exerted on a journal by a magnetic bearing actuator are presented, along with comparisons to experimentally measured forces. The calculations are based on two-dimensional solutions for the flux distribution in the metal parts and ...
Cite
Journal articleTribology Transactions · January 1, 1992
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 pred ...
Full textCite
Journal articleJournal of Tribology, Transactions of the ASME · 1992
In this paper the optimum geometrical configurations of a shrouded Rayleigh-step and a spiral groove viscous pump are analyzed. Then their performance characteristics are compared. The geometries and film shapes of these viscous pumps are optimized with re ...
Cite
Journal articleAmerican Society of Mechanical Engineers Paper · December 1, 1991
In this paper the optimum geometrical configurations of a shrouded Rayleigh-step and a spiral groove viscous pump are analyzed. Then their performance characteristics are compared. The geometries and film shapes of these viscous pumps are optimized with re ...
Cite
Journal articleTribology Transactions · January 1, 1990
A solution technique for tilting pad journal bearings is presented that includes two dimensional heat conduction in the individual pads and applies a heat convection boundary condition to the pad ends. The method makes use of approximations to the axial pr ...
Full textCite
Journal articleJournal of Tribology, Transactions of the ASME · 1990
A model for the thermal behavior of lubricant in the cavitated regions of a journal bearing is presented. The model assumes a bubbly mixture of liquid and air and includes the calculation of local mixture properties for the fluid film. Temperature in the f ...
Cite
Journal articleAmerican Society of Mechanical Engineers Paper · December 1, 1989
A model for the thermal behavior of lubricant in the cavitated regions of a journal bearing is presented. The model assumes a bubbly mixture of liquid and air and includes the calculation of local mixture properties of the fluid film. Temperature in the fi ...
Cite
Journal articleTribology Transactions · January 1, 1988
An overhung rotor was experimentally tested in two sets of five shoe tilting pad bearings. The preload factors of the two sets were 0.1 and 0.5, respectively. The rotor had critical speeds at 3000 and 6800 rpm. When mounted on the first set of bearings, th ...
Full textCite
Journal articleJournal of Tribology, Transactions of the ASME · 1988
An approximate solution technique for tilting pad journal bearings is presented. The method makes use of approximations to the axial pressure profile and the temperature profiles and includes heat transfer between the film and its boundaries. A second orde ...
Cite
Journal articleSTLE TRIBOLOGY TRANS. · 1988
An overhung motor with critical speeds of 3000 and 6800 rpm was experimentally tested in two sets of five shoe tilting pad bearings with preload factors of 0.1 and 0.5 respectively. Mounted on the first set the rotor remained stable to over 11,000 rpm but ...
Cite
Journal articleundefined · January 1, 1987
An approximate solution technique for tilting pad journal bearings is presented. The method makes use of approximations to the axial pressure profile and the temperature profiles and includes heat transfer between the film and its boundaries. A second orde ...
Cite
Journal articleASLE Transactions · 1987
An approximate solution technique for axially grooved fluid film journal bearings is presented. The method makes use of earlier approximations for the axial pressure distribution and the circumferential temperature variation and extends the theory to inclu ...
Cite
Journal articleASLE Transactions · January 1, 1987
An approximate solution technique for axially grooved fluid film journal bearings is presented. The method makes use of earlier approximations for the axial pressure distribution and the circumferential temperature variation and extends the theory to inclu ...
Full textCite
Journal article · January 1, 1987
An approximate solution technique for tilting pad journal bearings is presented. The method makes use of approximations to the axial pressure profile and the temperature profiles and includes heat transfer between the film and its boundaries. A second orde ...
Cite
Journal articleASLE Preprints · December 1, 1986
An approximate solutions technique for axially grooved fluid film journal bearings is presented. The method makes use of earlier approximations for the axial pressure distribution and the circumferential temperature variation and extends the theory to incl ...
Cite
Journal articleASLE Transactions · January 1, 1985
The effects of variations in lubricant supply pressure on the characteristics of two-lobe non-preloaded bearings are examined. The bearing solutions are obtained by an approximate method developed earlier that includes viscosity variation due to thermal ef ...
Full textCite
Journal articleI Mech E Conference Publications Institution of Mechanical Engineers · December 1, 1984
The model includes the motor, coupling, pump, casing and external supports with the associated bearings. Predicted forces on the impeller are obtained from scaled test results for somewhat similar impellers. Two types of analysis are considered: vibration ...
Cite
Journal articleundefined · January 1, 1984
A rotor dynamic analysis of a heat transport pump for nuclear power applications is carried out for normal, part void and full operating conditions. The model includes the motor, coupling, pump, casing and external supports with the associated bearings. Pr ...
Cite
Journal article · January 1, 1984
A rotor dynamic analysis of a heat transport pump for nuclear power applications is carried out for normal, part void and full operating conditions. The model includes the motor, coupling, pump, casing and external supports with the associated bearings. Pr ...
Cite
Journal articleJournal of the Franklin Institute · January 1, 1983
This paper considers vibration control of a single mass flexible rotor on damped flexible supports with active feedback control. Both proportional and derivative feedback control are utilized. Free vibrations and unbalance response of the rotor-control sys ...
Full textCite
Journal articleASLE Transactions · January 1, 1983
An approximate solution method for multilobe journal bearings that includes thermal effect is presented. The method is based on the assumption of an axial pressure distribution in the form of a polynomial, which allows the solution of Reynolds' equation by ...
Full textCite
Journal articleASLE Preprints · December 1, 1982
An approximate solution method for multilobe journal bearings that includes thermal effects is presented. The method is based on the assumption of an axial pressure distribution in the form of a polynomial, which allows the solution of Reynolds' equation b ...
Cite
