Review of ultrasonic-based technology for oil film thickness measurement in lubrication

Dou, Pan; Jia, Yaping; Zheng, Peng; Wu, Tingting; Yu, Min; Reddyhoff, Tom; Peng, Zhongxiao

doi:10.1016/j.triboint.2021.107290

Cited by 43 publications

(22 citation statements)

References 82 publications

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“…The varying discrepancies and noise in the lubrication film thickness estimates can be explained by a sensitivity analysis of the lubrication film thickness. It is from Equation (12) seen that the phase of the LPL is given by Equation (50).…”

Section: Sensitivitymentioning

confidence: 99%

“…The technology also appears promising in the evaluation of lubrication films surrounding seals such as liquid face seals [9], piston ring-liner contact [10], and simple rubber O-ring contact [11]. A recent comprehensive review of the basic principles of ultrasound reflectometry for lubrication films and its current applications can be found in [12]. This paper is for this reason not a review of the basic ultrasound reflectometry methods; instead, it is an in-depth review and comparison of the calibration methods needed for ultrasound reflectometry methods.…”

Section: Introductionmentioning

confidence: 99%

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A Comparison of Adaptive Ultrasound Reflectometry Calibration Methods for Use in Lubrication Films

Hansen

Johansen

2022

Energies

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Adaptive calibration for ultrasound reflectometry methods used in the detection of lubrication film thickness is of great research interest. This is mainly due to the versatile non-destructive implementation of the technology in industrial applications, allowing for measurements of the lubrication film thickness, which directly relates to the friction, wear, and overall efficiency of the system. This study reviews and compares a curve fitting, extended Kalman filter, and resonance frequency detection adaptive calibration approach. Furthermore, the study compares two different regression models, used for the curve fitting and the extended Kalman filter approach. The study compares the methods and regression models based on both a theoretical and experimental analysis. The experimental analysis is based on data with varying lubrication film thickness. The lubrication film thickness is varied such that the resonance frequency is both detectable and non-detectable within the ultrasound transducer bandwidth. It is found that all three methods give results very similar to those achieved through manual calibration. However, since the extended Kalman filter approach is the only method that allows for continuous calibration, this method is found to have the greatest potential of the methods compared.

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Section: Sensitivitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Comparison of Adaptive Ultrasound Reflectometry Calibration Methods for Use in Lubrication Films

Hansen

Johansen

2022

Energies

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“…As a result, it has been concluded that if mass continuity is the primary concern in solving the problem, then the Reynolds equation is inappropriate [30]. On the other hand, some methods exist to experimentally measure the film thickness at the contacting surfaces; for instance, capacitance, electric resistance, X-techniques, optical interferometer, and ultrasonic methods [31,32]. However, it is difficult and expensive to experimentally measure the changes in ML where the interrupted fluid film coexists with the solid contact.…”

Section: Introductionmentioning

confidence: 99%

CFD Investigation of Reynolds Flow around a Solid Obstacle

et al. 2022

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The Reynolds equation defines the lubrication flow between the smooth contacting parts. However, it is questionable that the equation can accurately anticipate pressure behavior involving undeformed solid asperity interactions that can occur under severe operating conditions. Perhaps, the mathematical model is inaccurate and incomplete, or some HL (hydrodynamic lubrication) and EHL (elastohydrodynamic lubrication) assumptions are invalid in the mixed lubrication region. In addition, the asperity contact boundary conditions may not have been properly defined to address the issue. Such a situation motivated the recent study of a 3D CFD investigation of Reynolds flow around the solid obstacle modelled in between the converging wedge. The produced results have been compared to analytical and numerical results obtained by employing the Reynolds equation. The validated CFD simulation is compared with the identical wedge, with cylindrical asperity at the center. A significant increase in pressure has been predicted because of asperity contact. The current study shows that the mathematical formulation of the ML problem has shortcomings. This necessitates the development of a new model that can also include fluid flow around asperity contacts for the accurate prediction of generated pressure. Consequently, sustainable tribological solutions for extreme loading conditions can be devised to improve efficiency and component performance.

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“…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 ]. Among them, the eddy-current method [ 24 , 25 ] is one of the most applied methods in industrial settings given its good working reliability, high sensitivity, and strong anti-interference ability.…”

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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Review of ultrasonic-based technology for oil film thickness measurement in lubrication

Cited by 43 publications

References 82 publications

A Comparison of Adaptive Ultrasound Reflectometry Calibration Methods for Use in Lubrication Films

A Comparison of Adaptive Ultrasound Reflectometry Calibration Methods for Use in Lubrication Films

CFD Investigation of Reynolds Flow around a Solid Obstacle

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

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