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High-accuracy ultrasonic method for in-situ monitoring of oil film thickness in a thrust bearing.

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Title: High-accuracy ultrasonic method for in-situ monitoring of oil film thickness in a thrust bearing.
Authors: Jia, Yaping1 (AUTHOR), Dou, Pan1 (AUTHOR), Zheng, Peng1 (AUTHOR), Wu, Tonghai1,2 (AUTHOR) tonghai.wu@mail.xjtu.edu.cn, Yang, Peiping3 (AUTHOR), Yu, Min4 (AUTHOR), Reddyhoff, Tom4 (AUTHOR)
Source: Mechanical Systems & Signal Processing. Nov2022, Vol. 180, pN.PAG-N.PAG. 1p.
Subjects: Thrust bearings, Ultrasonics, Ultrasonic effects, Loading & unloading, Thickness measurement
Abstract: • A theoretical investigation to clarify the thermal effect on ultrasonic signals. • Real-time compensation of amplitude attenuation and phase increment. • In-situ monitoring of oil film thickness in a tilting-pad thrust bearing. The ultrasonic method has been widely applied to measure the oil film thickness – a critical variable that reflects lubrication conditions. However, due to the thermal dependence of ultrasonic signals, significant deviations in film thickness measurements are introduced, hindering the in-situ application of the ultrasonic technique. To address this issue, a real-time temperature compensation method that can accurately obtain the frequency domain information of the reference signal is proposed. Specifically, the reflection from the substrate-coating interface compensates for the thermal effect on the phase increment and amplitude attenuation – this is noted as "self-calibration". An extra experimental test with a substrate-coating-air structure is performed to calibrate the thermal effect on the coating-induced phase shift – this part is denoted as "pre-calibration". The combination of "self-calibration" and "pre-calibration" enables the overall temperature compensation strategy. After the effectiveness validation with a temperature-controlled experiment, the proposed method is implemented in a thrust bearing in a heavy-duty hydropower generator with full running conditions, including loading and unloading, normal speed and shut-down. The largely ranged oil film thickness (3–330 μm) is ultrasonically measured and compared with the theoretical value, showing a higher measurement accuracy than the eddy current method. [ABSTRACT FROM AUTHOR]
Copyright of Mechanical Systems & Signal Processing is the property of Academic Press Inc. 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
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Header DbId: egs
DbLabel: Engineering Source
An: 157712488
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
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  Data: High-accuracy ultrasonic method for in-situ monitoring of oil film thickness in a thrust bearing.
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  Data: <searchLink fieldCode="AR" term="%22Jia%2C+Yaping%22">Jia, Yaping</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Dou%2C+Pan%22">Dou, Pan</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Zheng%2C+Peng%22">Zheng, Peng</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Wu%2C+Tonghai%22">Wu, Tonghai</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> tonghai.wu@mail.xjtu.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Yang%2C+Peiping%22">Yang, Peiping</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Yu%2C+Min%22">Yu, Min</searchLink><relatesTo>4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Reddyhoff%2C+Tom%22">Reddyhoff, Tom</searchLink><relatesTo>4</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Mechanical+Systems+%26+Signal+Processing%22">Mechanical Systems & Signal Processing</searchLink>. Nov2022, Vol. 180, pN.PAG-N.PAG. 1p.
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  Data: <searchLink fieldCode="DE" term="%22Thrust+bearings%22">Thrust bearings</searchLink><br /><searchLink fieldCode="DE" term="%22Ultrasonics%22">Ultrasonics</searchLink><br /><searchLink fieldCode="DE" term="%22Ultrasonic+effects%22">Ultrasonic effects</searchLink><br /><searchLink fieldCode="DE" term="%22Loading+%26+unloading%22">Loading & unloading</searchLink><br /><searchLink fieldCode="DE" term="%22Thickness+measurement%22">Thickness measurement</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: • A theoretical investigation to clarify the thermal effect on ultrasonic signals. • Real-time compensation of amplitude attenuation and phase increment. • In-situ monitoring of oil film thickness in a tilting-pad thrust bearing. The ultrasonic method has been widely applied to measure the oil film thickness – a critical variable that reflects lubrication conditions. However, due to the thermal dependence of ultrasonic signals, significant deviations in film thickness measurements are introduced, hindering the in-situ application of the ultrasonic technique. To address this issue, a real-time temperature compensation method that can accurately obtain the frequency domain information of the reference signal is proposed. Specifically, the reflection from the substrate-coating interface compensates for the thermal effect on the phase increment and amplitude attenuation – this is noted as "self-calibration". An extra experimental test with a substrate-coating-air structure is performed to calibrate the thermal effect on the coating-induced phase shift – this part is denoted as "pre-calibration". The combination of "self-calibration" and "pre-calibration" enables the overall temperature compensation strategy. After the effectiveness validation with a temperature-controlled experiment, the proposed method is implemented in a thrust bearing in a heavy-duty hydropower generator with full running conditions, including loading and unloading, normal speed and shut-down. The largely ranged oil film thickness (3–330 μm) is ultrasonically measured and compared with the theoretical value, showing a higher measurement accuracy than the eddy current method. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Mechanical Systems & Signal Processing is the property of Academic Press Inc. 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:
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      – Type: doi
        Value: 10.1016/j.ymssp.2022.109453
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      – Code: eng
        Text: English
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      – SubjectFull: Loading & unloading
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      – TitleFull: High-accuracy ultrasonic method for in-situ monitoring of oil film thickness in a thrust bearing.
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            NameFull: Jia, Yaping
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            NameFull: Yang, Peiping
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              Text: Nov2022
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              Y: 2022
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