Co-located dual-wave ultrasonics for lubricant film thickness and interfacial temperature monitoring.
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| Title: | Co-located dual-wave ultrasonics for lubricant film thickness and interfacial temperature monitoring. |
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| Authors: | Dou, Pan1 (AUTHOR), Zhang, Yifeng1 (AUTHOR), Lan, Bo1 (AUTHOR), Cegla, Frederic1 (AUTHOR) f.cegla@imperial.ac.uk, Reddyhoff, Thomas1 (AUTHOR) t.reddyhoff@imperial.ac.uk, Yu, Min1 (AUTHOR) |
| Source: | Tribology International. Jun2026, Vol. 218, pN.PAG-N.PAG. 1p. |
| Subjects: | Ultrasonic measurement, Temperature measurements, Industrial equipment, Elastic waves, Condition-based maintenance, Boundary lubrication, Longitudinal waves |
| Abstract: | A lubricant film separates metal-to-metal contacts and is critical for industrial components such as bearings, engines, and transmissions, to assure their durability and energy efficiency. The lubricant film thickness can reflect oil rheological properties and thus its degradation, while the interfacial temperature variation is mainly caused by friction heating that can reflect wear conditions. Therefore, simultaneous monitoring of these two key variables will enable comprehensive characterization of the lubrication condition, facilitating predictive maintenance of energy equipment. Traditional ultrasonic measurement techniques based on longitudinal waves have been widely employed for monitoring lubricant film thickness; however, the acoustic velocity in such methods is highly sensitive to temperature and lacks effective compensation mechanisms. This severely limits their applicability in high-precision scenarios. To address this issue, this paper proposes a hybrid ultrasonic measurement approach that employs co-located longitudinal and shear waves. Shear waves propagate only in solids and are unaffected by the lubricant film, while longitudinal waves travel through both solids and liquids. Thus, the method utilizes the longitudinal wave to estimate film thickness and the shear wave to evaluate solid temperature and infer interfacial temperature. This temperature information is then used to improve estimates of the phase of the wave that is propagating in the solid medium and the assumed acoustic velocity in the lubricating film, thereby enhancing the accuracy and robustness of thickness measurements. Experimental validation was conducted on both a heating plate and a rheometer system. The temperature experiments demonstrated the feasibility of using ultrasound to measure temperature gradients within solids. On the rheometer platform, practical lubrication conditions were simulated by adjusting the upper plate temperature, allowing for further evaluation of the shear-wave-based temperature sensing method. Experimental results confirm that the proposed method can accurately obtain interfacial temperatures and compensate for temperature-induced errors in the lubricant film thickness measurements. [ABSTRACT FROM AUTHOR] |
| Copyright of Tribology International is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 191449305 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Co-located dual-wave ultrasonics for lubricant film thickness and interfacial temperature monitoring. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Dou%2C+Pan%22">Dou, Pan</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Zhang%2C+Yifeng%22">Zhang, Yifeng</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Lan%2C+Bo%22">Lan, Bo</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Cegla%2C+Frederic%22">Cegla, Frederic</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> f.cegla@imperial.ac.uk</i><br /><searchLink fieldCode="AR" term="%22Reddyhoff%2C+Thomas%22">Reddyhoff, Thomas</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> t.reddyhoff@imperial.ac.uk</i><br /><searchLink fieldCode="AR" term="%22Yu%2C+Min%22">Yu, Min</searchLink><relatesTo>1</relatesTo> (AUTHOR) – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Tribology+International%22">Tribology International</searchLink>. Jun2026, Vol. 218, pN.PAG-N.PAG. 1p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Ultrasonic+measurement%22">Ultrasonic measurement</searchLink><br /><searchLink fieldCode="DE" term="%22Temperature+measurements%22">Temperature measurements</searchLink><br /><searchLink fieldCode="DE" term="%22Industrial+equipment%22">Industrial equipment</searchLink><br /><searchLink fieldCode="DE" term="%22Elastic+waves%22">Elastic waves</searchLink><br /><searchLink fieldCode="DE" term="%22Condition-based+maintenance%22">Condition-based maintenance</searchLink><br /><searchLink fieldCode="DE" term="%22Boundary+lubrication%22">Boundary lubrication</searchLink><br /><searchLink fieldCode="DE" term="%22Longitudinal+waves%22">Longitudinal waves</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: A lubricant film separates metal-to-metal contacts and is critical for industrial components such as bearings, engines, and transmissions, to assure their durability and energy efficiency. The lubricant film thickness can reflect oil rheological properties and thus its degradation, while the interfacial temperature variation is mainly caused by friction heating that can reflect wear conditions. Therefore, simultaneous monitoring of these two key variables will enable comprehensive characterization of the lubrication condition, facilitating predictive maintenance of energy equipment. Traditional ultrasonic measurement techniques based on longitudinal waves have been widely employed for monitoring lubricant film thickness; however, the acoustic velocity in such methods is highly sensitive to temperature and lacks effective compensation mechanisms. This severely limits their applicability in high-precision scenarios. To address this issue, this paper proposes a hybrid ultrasonic measurement approach that employs co-located longitudinal and shear waves. Shear waves propagate only in solids and are unaffected by the lubricant film, while longitudinal waves travel through both solids and liquids. Thus, the method utilizes the longitudinal wave to estimate film thickness and the shear wave to evaluate solid temperature and infer interfacial temperature. This temperature information is then used to improve estimates of the phase of the wave that is propagating in the solid medium and the assumed acoustic velocity in the lubricating film, thereby enhancing the accuracy and robustness of thickness measurements. Experimental validation was conducted on both a heating plate and a rheometer system. The temperature experiments demonstrated the feasibility of using ultrasound to measure temperature gradients within solids. On the rheometer platform, practical lubrication conditions were simulated by adjusting the upper plate temperature, allowing for further evaluation of the shear-wave-based temperature sensing method. Experimental results confirm that the proposed method can accurately obtain interfacial temperatures and compensate for temperature-induced errors in the lubricant film thickness measurements. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Tribology International is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1016/j.triboint.2026.111690 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 1 StartPage: N.PAG Subjects: – SubjectFull: Ultrasonic measurement Type: general – SubjectFull: Temperature measurements Type: general – SubjectFull: Industrial equipment Type: general – SubjectFull: Elastic waves Type: general – SubjectFull: Condition-based maintenance Type: general – SubjectFull: Boundary lubrication Type: general – SubjectFull: Longitudinal waves Type: general Titles: – TitleFull: Co-located dual-wave ultrasonics for lubricant film thickness and interfacial temperature monitoring. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Dou, Pan – PersonEntity: Name: NameFull: Zhang, Yifeng – PersonEntity: Name: NameFull: Lan, Bo – PersonEntity: Name: NameFull: Cegla, Frederic – PersonEntity: Name: NameFull: Reddyhoff, Thomas – PersonEntity: Name: NameFull: Yu, Min IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 06 Text: Jun2026 Type: published Y: 2026 Identifiers: – Type: issn-print Value: 0301679X Numbering: – Type: volume Value: 218 Titles: – TitleFull: Tribology International Type: main |
| ResultId | 1 |
