Dynamic Film Measurements in Journal Bearings Using an Optical Sensor

Jaloszynski, Tory M.; Evers, Lawrence W.

doi:10.4271/970846

Cited by 8 publications

(2 citation statements)

References 7 publications

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“…Film-thickness prediction techniques are suitable for many bearing-design applications. However, more direct measurement methods are often required for high-precision or high-load systems [ 13 ]. Many film-thickness measurement methods are available, such as electrical methods [ 14 , 15 , 16 ], optical methods [ 17 , 18 , 19 , 20 ], and ultrasonic methods [ 21 , 22 , 23 ].…”

Section: Introductionmentioning

confidence: 99%

Film-Thickness Identification Method and Lubrication Characteristic Experiment of Full-Size Water-Lubricated Stern Bearing under Offset Load

Ouyang

Liu

et al. 2022

Sensors

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Water-lubricated stern bearing (WSB) is a vital part of the ship propulsion-shaft system, and it is of great significance to monitor and analyze its lubrication status through film thickness data to improve the equipment operational reliability. In this paper, a full-size, large length-to-diameter ratio WSB experiment is carried out, and multi-sectional journal displacement data are collected under offset load. Accordingly, a bearing film-thickness identification model is established, which can identify the dynamic film thickness data in the circumferential direction of bearing section by limited measurement points. On this basis, the film thickness distribution of the full bearing is obtained by combining finite element (FE) simulation and particle swarm optimization (PSO) algorithm. The effect of different speeds on the distributed lubrication characteristics of WSB under offset load was systematically analyzed based on film thickness data. Results show that the maximum identification error of the bearing film-thickness identification model is less than 7%. The bearing lubrication state changes dynamically as the speed increases, and the hydrodynamic lubrication effect in the middle of the bearing is enhanced. The area of each lubrication sub-region varies nonlinearly. Research results are instructive for further determine the service life of the shaft system.

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Section: Introductionmentioning

confidence: 99%

Film-Thickness Identification Method and Lubrication Characteristic Experiment of Full-Size Water-Lubricated Stern Bearing under Offset Load

Ouyang

Liu

et al. 2022

Sensors

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show abstract

“…Current film thickness prediction techniques are satisfactory for many bearing design applications. However, for high precision or highly loaded systems a more direct measurement approach is often required [1]. For example, the use of environmentally acceptable lubricants (EALs) in marine stern tube bearings has proven challenging, leading to unprecedented wear and failure rates.…”

Section: Introductionmentioning

confidence: 99%

Circumferential film thickness measurement in journal bearings via the ultrasonic technique

Beamish

Brunskill

et al. 2020

Tribology International

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A key parameter in hydrodynamic journal bearing performance is lubricant layer thickness around the circumference of the shaft-bearing interface. In the present work, the ultrasonic amplitude, phase change and resonant dip techniques are applied to obtain circumferential film thickness profiles in a bespoke journal bearing test platform under a range of shaft-aligned, shaft-misaligned and shut-down operating conditions. Film thickness results are compared against the Raimondi-Boyd theoretical prediction model and eddy current sensor measurements. By using an on-line referencing technique, the amplitude and phase change models demonstrated high accuracy for thin films and the resonant dip technique enabled film measurements within the bearing thick film region. Thus, applying the three methods simultaneously allowed analysis of lubricant films around the bearing circumference.

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Experimental Study of the Shaft Motion in the Journal Bearing of a Gear Pump

Castilla¹,

Gutes²,

Gamez-Montero³

et al. 2009

Journal of Engineering for Gas Turbines and Power

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The movement of the shaft of a driven gear in a gear pump is experimentally studied. Three different methods are considered, and the use of a laser micrometer measurement method is validated. In order to use the laser micrometer, some modifications are made to the gear pump. Experimental results for different working pressures and rotational velocities are shown. For a low nondimensional working pressure, defined in a similar way as the Sommerfeld load, experimental and numerical results agree very well for relative eccentricity. Nevertheless, experimental results made clear that the role of the lateral plate of the pump is very important for high nondimensional working pressure. A value of 100 is given for the critical nondimensional working pressure in order to avoid wear and slant in the lateral plate. Frequency analysis of the outlet pressure, as well as the precise measurement of the wear in the pump case, support experimental observation of the inability of the journal to retain the shaft for high nondimensional pressure.

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Dynamic Film Measurements in Journal Bearings Using an Optical Sensor

Cited by 8 publications

References 7 publications

Film-Thickness Identification Method and Lubrication Characteristic Experiment of Full-Size Water-Lubricated Stern Bearing under Offset Load

Film-Thickness Identification Method and Lubrication Characteristic Experiment of Full-Size Water-Lubricated Stern Bearing under Offset Load

Circumferential film thickness measurement in journal bearings via the ultrasonic technique

Experimental Study of the Shaft Motion in the Journal Bearing of a Gear Pump

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