An Experimental Study of Grease-Lubricated Journal Bearings Undergoing Oscillatory Motion

Xiaobin Lu; M. M. Khonsari

doi:10.1115/1.2736705

An Experimental Study of Grease-Lubricated Journal Bearings Undergoing Oscillatory Motion

Journal of Tribology ◽

10.1115/1.2736705 ◽

2007 ◽

Vol 129 (3) ◽

pp. 640-646 ◽

Cited By ~ 6

Author(s):

Xiaobin Lu ◽

M. M. Khonsari

Keyword(s):

Experimental Study ◽

Hysteresis Loop ◽

Journal Bearings ◽

Oscillatory Motion ◽

Hydrodynamic Regime ◽

Series Of Experiments

A series of experiments was performed to study the behavior of grease-lubricated journal bearings. The results reveal that an oscillatory bearing undergoes a transition from boundary, to mixed, and to hydrodynamic regime. Another distinct feature is friction hysteresis that occurs as a result of oscillation. In this paper, we examine the effect of load, oscillating frequency, and lubricant on the friction hysteresis loop.

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An Experimental Study of Oil-Lubricated Journal Bearings Undergoing Oscillatory Motion

Journal of Tribology ◽

10.1115/1.2908907 ◽

2008 ◽

Vol 130 (2) ◽

Cited By ~ 6

Author(s):

Xiaobin Lu ◽

M. M. Khonsari

Keyword(s):

Experimental Study ◽

Hysteresis Loop ◽

Journal Bearing ◽

Journal Bearings ◽

Oscillatory Motion ◽

Hydrodynamic Regime ◽

Inlet Temperature ◽

Lubricant Flow ◽

Series Of Experiments ◽

Oil Type

A distinctive behavior of an oil-lubricated journal bearing undergoing oscillatory motion is the evolution of friction hysteresis as it traverses from boundary, to mixed, and to hydrodynamic regime. In this paper, the results of a series of experiments are reported to examine the effects of load, with or without oil, oil type, oil inlet temperature, and oscillating frequency on the friction hysteresis. Three types of hysteresis loop were found. The inertia of the lubricant flow contributes to the friction hysteresis.

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Experimental Analysis of Journal Bearings Undergoing Oscillatory Motion

ASME/STLE 2007 International Joint Tribology Conference, Parts A and B ◽

10.1115/ijtc2007-44451 ◽

2007 ◽

Author(s):

Xiaobin Lu ◽

Michael M. Khonsari

Keyword(s):

Friction Coefficient ◽

Thermal Field ◽

Journal Bearing ◽

Journal Bearings ◽

Oscillatory Motion ◽

Temperature History ◽

The Finite Element Method ◽

History Of ◽

Series Of Experiments ◽

Good Agreement

A series of experiments is carried out on a grease-lubricated, heavy loaded journal bearing undergoing oscillatory motion to examine its thermal field. The history of temperature measurement and the friction coefficient are monitored. The finite element method is employed using ANSYS to simulate the temperature history with input of the friction coefficient result. Experiment and simulation show good agreement.

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EXPERIMENTAL STUDY OF REACTION OF ETHANOL WITH OXYGEN BEHIND SHOCK WAVES USING ATOMIC RESONANCE ABSORPTION SPECTROSCOPY METHOD

NONEQUILIBRIUM PROCESSES. Vol. 2. Fundamentals of combustion ◽

10.30826/nepcap2018-2-35 ◽

2020 ◽

Author(s):

N. S. Bystrov ◽

◽

A. V. Emelianov ◽

A. V. Eremin ◽

P. I. Yatsenko ◽

...

Keyword(s):

Experimental Study ◽

Shock Waves ◽

Absorption Spectroscopy ◽

Vacuum Ultraviolet ◽

Resonance Absorption ◽

Atomic Resonance ◽

Quantitative Measurements ◽

Series Of Experiments ◽

Kinetics Of Reaction ◽

Oxygen Atoms

The kinetics of reaction of C2H5OH with N2O behind shock waves is studied. The quantitative measurements of the time profiles of concentration of O atoms were carried out by the method of atomic resonance absorption spectroscopy (ARAS) using resonance vacuum-ultraviolet line of O-atom at 130.5 nm. For the calibration of absorption intensity of oxygen atoms depending on its concentration, the special series of experiments in the mixture containing different amounts of N2O in Ar was carried out at T = 2100 ± 50 K when molecule of N2O is completely dissociated. An experimental study of the appearance and consumption of oxygen atoms during the reaction of ethanol with oxygen in mixture 10 ppm N2O + (10 ... 0.1) ppm C2H5OH + Ar at temperatures of 16002300 K and pressures of 200-300 kPa have been carried out. A kinetic analysis of obtained data was performed using the Chemkin package.

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Use of a Pendulum for Passive Structural Vibrations Control: An Experimental Study

14th Biennial Conference on Mechanical Vibration and Noise: Dynamics and Vibration of Time-Varying Systems and Structures ◽

10.1115/detc1993-0108 ◽

1993 ◽

Author(s):

A. Ertas ◽

O. Cuvalci

Keyword(s):

Experimental Study ◽

Dynamic Response ◽

Passive Control ◽

Control Device ◽

Structural Vibrations ◽

Pendulum System ◽

Series Of Experiments ◽

Tip Mass

Abstract The dynamic response of a beam-tip mass-pendulum system subjected to sinusoidal excitations is considered. The conditions under which resonant and nonresonant oscillations occur are investigated and discussed. The main objective of this study was to conduct a series of experiments to investigate the autoparametric interaction between the first two modes of the system. The use of a pendulum as a passive control device was experimentally evaluated.

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