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In-situ adaptive calibration of incident signal of ultrasonic lubricant film thickness measurements.

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Title: In-situ adaptive calibration of incident signal of ultrasonic lubricant film thickness measurements.
Authors: Wu, Quanzhong1 (AUTHOR), Dou, Pan1,2 (AUTHOR) p.dou@xjtu.edu.cn, Chang, Shiyuan1 (AUTHOR), Wu, Tonghai1 (AUTHOR) tonghai.wu@mail.xjtu.edu.cn, Yu, Min2 (AUTHOR), Lei, Yaguo1 (AUTHOR)
Source: Mechanical Systems & Signal Processing. Feb2025, Vol. 224, pN.PAG-N.PAG. 1p.
Subjects: Amplitude estimation, Measurement errors, Thickness measurement, Ultrasonic measurement, Thrust bearings
Abstract: In ultrasonic reflection measurements of lubricant film thickness, an incident wave is needed as a reference signal and is typically calibrated under controlled ex-situ conditions. However, existing calibration methods have two limitations: 1) significant measurement errors are introduced due to the discrepancy between the calibration environment and the varying operational conditions (for example, temperature), and 2) disassembly of tribo-pairs is necessary. To address these issues, a novel method that enables in-situ adaptive calibration of incident signals is proposed. Particularly, it is found that the variation of the reflected signal against lubricant film thickness can well fit a circle in the polar coordinate, where the desirable incident signals can be extracted using the size and the location of the established circle. Importantly, the circle is iteratively updated to adapt to the variation of the working environment. This novel approach of calibrating incident signals, named the "circle-fitting method", does not require knowledge of the acoustic properties of tribo-pairs and is thus temperature independent. For experimental validation, two test setups of a micrometer-driven calibration rig and a tilting pad thrust bearing platform have been used separately to implement ultrasound measurements of lubricant film thickness, demonstrating accurate results as evidenced by error analysis. Specifically, in the experiment with the micrometer-driven calibration rig, the measurements yielded an amplitude estimation error of 0.2% and a phase estimation error of 0.66%. [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: 182121396
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
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  Label: Title
  Group: Ti
  Data: In-situ adaptive calibration of incident signal of ultrasonic lubricant film thickness measurements.
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  Data: <searchLink fieldCode="AR" term="%22Wu%2C+Quanzhong%22">Wu, Quanzhong</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Dou%2C+Pan%22">Dou, Pan</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> p.dou@xjtu.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Chang%2C+Shiyuan%22">Chang, Shiyuan</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Wu%2C+Tonghai%22">Wu, Tonghai</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> tonghai.wu@mail.xjtu.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Yu%2C+Min%22">Yu, Min</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Lei%2C+Yaguo%22">Lei, Yaguo</searchLink><relatesTo>1</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Mechanical+Systems+%26+Signal+Processing%22">Mechanical Systems & Signal Processing</searchLink>. Feb2025, Vol. 224, pN.PAG-N.PAG. 1p.
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  Data: <searchLink fieldCode="DE" term="%22Amplitude+estimation%22">Amplitude estimation</searchLink><br /><searchLink fieldCode="DE" term="%22Measurement+errors%22">Measurement errors</searchLink><br /><searchLink fieldCode="DE" term="%22Thickness+measurement%22">Thickness measurement</searchLink><br /><searchLink fieldCode="DE" term="%22Ultrasonic+measurement%22">Ultrasonic measurement</searchLink><br /><searchLink fieldCode="DE" term="%22Thrust+bearings%22">Thrust bearings</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: In ultrasonic reflection measurements of lubricant film thickness, an incident wave is needed as a reference signal and is typically calibrated under controlled ex-situ conditions. However, existing calibration methods have two limitations: 1) significant measurement errors are introduced due to the discrepancy between the calibration environment and the varying operational conditions (for example, temperature), and 2) disassembly of tribo-pairs is necessary. To address these issues, a novel method that enables in-situ adaptive calibration of incident signals is proposed. Particularly, it is found that the variation of the reflected signal against lubricant film thickness can well fit a circle in the polar coordinate, where the desirable incident signals can be extracted using the size and the location of the established circle. Importantly, the circle is iteratively updated to adapt to the variation of the working environment. This novel approach of calibrating incident signals, named the "circle-fitting method", does not require knowledge of the acoustic properties of tribo-pairs and is thus temperature independent. For experimental validation, two test setups of a micrometer-driven calibration rig and a tilting pad thrust bearing platform have been used separately to implement ultrasound measurements of lubricant film thickness, demonstrating accurate results as evidenced by error analysis. Specifically, in the experiment with the micrometer-driven calibration rig, the measurements yielded an amplitude estimation error of 0.2% and a phase estimation error of 0.66%. [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:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1016/j.ymssp.2024.112236
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 1
        StartPage: N.PAG
    Subjects:
      – SubjectFull: Amplitude estimation
        Type: general
      – SubjectFull: Measurement errors
        Type: general
      – SubjectFull: Thickness measurement
        Type: general
      – SubjectFull: Ultrasonic measurement
        Type: general
      – SubjectFull: Thrust bearings
        Type: general
    Titles:
      – TitleFull: In-situ adaptive calibration of incident signal of ultrasonic lubricant film thickness measurements.
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          Name:
            NameFull: Wu, Quanzhong
      – PersonEntity:
          Name:
            NameFull: Dou, Pan
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            NameFull: Chang, Shiyuan
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            NameFull: Wu, Tonghai
      – PersonEntity:
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            NameFull: Yu, Min
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            NameFull: Lei, Yaguo
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          Dates:
            – D: 01
              M: 02
              Text: Feb2025
              Type: published
              Y: 2025
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              Value: 224
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            – TitleFull: Mechanical Systems & Signal Processing
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