Performance analysis of journal bearings using ultrasonic reflection

Kasolang, Salmiah; Ahmed, Diyar I.; Dwyer-Joyce, R. S.; Yousif, B. F.

doi:10.1016/j.triboint.2013.02.012

Cited by 10 publications

(6 citation statements)

References 21 publications

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“…where B denotes the bulk modulus of the applied lubricant and h represents the thickness of the oilfilm formed from the applied oil at the roll-metal interface during the rolling operation [18,[22][23][24][25].…”

Section: Theoretical Backgroundmentioning

confidence: 99%

“…The lubricant stiffness, , is calculated by subtracting the dry normal stiffness value from the total stiffness in Equation (6). This is carried out by equating the ratio shear stiffness and average stiffness to the Poisson's ratio of the rolled material, expressed as: Hence, the oil-film thickness is calculated through the liquid normal stiffness using the spring model as shown in Equation (9): where denotes the bulk modulus of the applied lubricant and represents the thickness of the oil-film formed from the applied oil at the roll-metal interface during the rolling operation [18,22–25].…”

Section: Theoretical Backgroundmentioning

confidence: 99%

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Ultrasonic technique for measurement of oil-film thickness in metal cold rolling

Adeyemi

Dwyer-Joyce

Stephen

et al. 2021

Tribology - Materials, Surfaces & Interfaces

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Lubrication is essential in metal cold rolling operation to regulate friction at the metal-roll interface, reduce energy loss and improve the product surface finish. A novel non-intrusive pitch-catch technique, based on the reflection of ultrasound, was employed on a pilot mill to evaluate oil-film thickness at the metal-roll interface during the metal cold rolling operation. During the metal rolling process, oil-film thickness was measured under varying rolling load and rolling speed. The oil-film thickness increases as the roll speed increases and reduces as the rolling load increases. The values of oil-film thickness obtained from this non-intrusive ultrasonic technique agree with theoretical values. This study is a proof of concept and has shown promising results. If further developed, the technique could be employed for in situ monitoring of lubricant during rolling operation in metal rolling industries.

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Section: Theoretical Backgroundmentioning

confidence: 99%

Section: Theoretical Backgroundmentioning

confidence: 99%

Ultrasonic technique for measurement of oil-film thickness in metal cold rolling

Adeyemi

Dwyer-Joyce

Stephen

et al. 2021

Tribology - Materials, Surfaces & Interfaces

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“…The spring model is limited by the range of thicknesses it can measure and an additional model, the resonant dip technique, is introduced to account for thicker layers [9]. The application of ultrasonic methods on journal bearings has also been studied extensively for online oil-film thickness measurements [8,[10][11][12].…”

Section: Introductionmentioning

confidence: 99%

A Bayesian approach for shaft centre localisation in journal bearings

Lindley¹,

Beamish²,

Dwyer-Joyce³

et al. 2022

Mechanical Systems and Signal Processing

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“…As a kind of promising non-contact bearings, ultrasonic bearings actuated by smart materials such as PZT ceramics show a good application prospect in high-speed machines and precision-measuring devices [4], [5]. Compared with the conventional non-contact bearings such as hydrostatic bearings, hydrodynamic bearings and electromagnetic suspending bearings, the ultrasonic bearings are environmentally friendly bearings using air as working medium.…”

Section: Introductionmentioning

confidence: 99%

Prediction of Load-Carrying Capacity in the Radial Direction for Piezoelectric-Driven Ultrasonic Bearings

Deng

2019

IEEE Access

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This paper presents a theoretical modeling method on radial levitation force for ultrasonic bearings actuated by piezoelectric transducers with the aim of predicting their load-carrying capacity. The finite difference method is adapted to calculate the model, which is represented by a high-order multidimensional partial differential equation. The static levitation force testing experiments validate that the established mechanical model can interpret the experimental data well. This model also reveals that the ultrasonic bearing's levitation mechanism under the comprehensive action of near-field acoustic levitation effect and hydrodynamic effect when the bearing operates at high speeds. Some key factors including bearing's dynamic parameters, working media, clearance sizes, and environmental conditions that influence the ultrasonic bearing's levitation effect are discussed. The analysis of these factors can guide the ultrasonic bearing's structural design and the selection of the ultrasonic bearing's working parameters.

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Performance analysis of journal bearings using ultrasonic reflection

Cited by 10 publications

References 21 publications

Ultrasonic technique for measurement of oil-film thickness in metal cold rolling

Ultrasonic technique for measurement of oil-film thickness in metal cold rolling

A Bayesian approach for shaft centre localisation in journal bearings

Prediction of Load-Carrying Capacity in the Radial Direction for Piezoelectric-Driven Ultrasonic Bearings

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