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High-accuracy incident signal reconstruction for in-situ ultrasonic measurement of oil film thickness.

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Title: High-accuracy incident signal reconstruction for in-situ ultrasonic measurement of oil film thickness.
Authors: Dou, Pan1 (AUTHOR), Jia, Yaping1 (AUTHOR), Wu, Tonghai1 (AUTHOR) wt-h@163.com, Peng, Zhongxiao2 (AUTHOR), Yu, Min3 (AUTHOR), Reddyhoff, Tom3 (AUTHOR)
Source: Mechanical Systems & Signal Processing. Jul2021, Vol. 156, pN.PAG-N.PAG. 1p.
Subjects: Ultrasonic measurement, Signal reconstruction, Petroleum, Reflectance, Ultrasonic waves
Abstract: • The relationships of the reflected signal and the incident signal are clarified. • The spectrum of the incident signal is obtained from the reflected signals. • A reconstruction algorithm of the incident signal is proposed. The oil film thickness in an oil-lubricated tribo-pair can be measured using reflected ultrasonic waves and various transformation models. Conventionally, this approach requires the incident signal to be calibrated using off-line methods prior to testing, and this limits the on-line measurement of oil film thickness in sliding components such as journal bearings. To enable on-line calibration, we propose a method of reconstructing the incident signal from the easily obtained reflected signal. This involves analyzing the amplitude and phase spectrum of the reflection coefficient to reconstruct the incident signal. More specifically, the following main findings of the amplitude and phase of reflection coefficient at the resonance frequency are reported. 1) There is a zero-crossing at the resonance frequency, and therefore the phases of the incident and reflected signal are the same. 2) If part of the reflected signal is included for calculation, the frequency of the extreme point in the amplitude spectrum of the reflected signal is equal to the resonance frequency only when the extreme point phenomenon occurs at the center frequency of the transducer. At other positions, the frequency of the minimum amplitude in the amplitude spectrum of the reflected signal is not equal to the resonance frequency. Utilizing these relationships, the phase and amplitude of the incident signal can be accurately reconstructed by following the proposed method, provided the thickness of the oil film between the tribo-pairs can be widely ranged to cover both the blind and the resonance zones. Correspondingly, a practical schedule for the on-line reconstruction of the incident signal is proposed, which includes an operation to adjust the oil film thickness within the blind and the resonance zone. This method is validated on a test rig by comparing it with the traditional off-line methods. [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: 149332203
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
IllustrationInfo
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  Label: Title
  Group: Ti
  Data: High-accuracy incident signal reconstruction for in-situ ultrasonic measurement of oil film thickness.
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  Data: <searchLink fieldCode="AR" term="%22Dou%2C+Pan%22">Dou, Pan</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Jia%2C+Yaping%22">Jia, Yaping</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Wu%2C+Tonghai%22">Wu, Tonghai</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> wt-h@163.com</i><br /><searchLink fieldCode="AR" term="%22Peng%2C+Zhongxiao%22">Peng, Zhongxiao</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Yu%2C+Min%22">Yu, Min</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Reddyhoff%2C+Tom%22">Reddyhoff, Tom</searchLink><relatesTo>3</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Mechanical+Systems+%26+Signal+Processing%22">Mechanical Systems & Signal Processing</searchLink>. Jul2021, Vol. 156, pN.PAG-N.PAG. 1p.
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  Data: <searchLink fieldCode="DE" term="%22Ultrasonic+measurement%22">Ultrasonic measurement</searchLink><br /><searchLink fieldCode="DE" term="%22Signal+reconstruction%22">Signal reconstruction</searchLink><br /><searchLink fieldCode="DE" term="%22Petroleum%22">Petroleum</searchLink><br /><searchLink fieldCode="DE" term="%22Reflectance%22">Reflectance</searchLink><br /><searchLink fieldCode="DE" term="%22Ultrasonic+waves%22">Ultrasonic waves</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: • The relationships of the reflected signal and the incident signal are clarified. • The spectrum of the incident signal is obtained from the reflected signals. • A reconstruction algorithm of the incident signal is proposed. The oil film thickness in an oil-lubricated tribo-pair can be measured using reflected ultrasonic waves and various transformation models. Conventionally, this approach requires the incident signal to be calibrated using off-line methods prior to testing, and this limits the on-line measurement of oil film thickness in sliding components such as journal bearings. To enable on-line calibration, we propose a method of reconstructing the incident signal from the easily obtained reflected signal. This involves analyzing the amplitude and phase spectrum of the reflection coefficient to reconstruct the incident signal. More specifically, the following main findings of the amplitude and phase of reflection coefficient at the resonance frequency are reported. 1) There is a zero-crossing at the resonance frequency, and therefore the phases of the incident and reflected signal are the same. 2) If part of the reflected signal is included for calculation, the frequency of the extreme point in the amplitude spectrum of the reflected signal is equal to the resonance frequency only when the extreme point phenomenon occurs at the center frequency of the transducer. At other positions, the frequency of the minimum amplitude in the amplitude spectrum of the reflected signal is not equal to the resonance frequency. Utilizing these relationships, the phase and amplitude of the incident signal can be accurately reconstructed by following the proposed method, provided the thickness of the oil film between the tribo-pairs can be widely ranged to cover both the blind and the resonance zones. Correspondingly, a practical schedule for the on-line reconstruction of the incident signal is proposed, which includes an operation to adjust the oil film thickness within the blind and the resonance zone. This method is validated on a test rig by comparing it with the traditional off-line methods. [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.2021.107669
    Languages:
      – Code: eng
        Text: English
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      Pagination:
        PageCount: 1
        StartPage: N.PAG
    Subjects:
      – SubjectFull: Ultrasonic measurement
        Type: general
      – SubjectFull: Signal reconstruction
        Type: general
      – SubjectFull: Petroleum
        Type: general
      – SubjectFull: Reflectance
        Type: general
      – SubjectFull: Ultrasonic waves
        Type: general
    Titles:
      – TitleFull: High-accuracy incident signal reconstruction for in-situ ultrasonic measurement of oil film thickness.
        Type: main
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          Name:
            NameFull: Dou, Pan
      – PersonEntity:
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            NameFull: Jia, Yaping
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            NameFull: Wu, Tonghai
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            NameFull: Peng, Zhongxiao
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            NameFull: Yu, Min
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            NameFull: Reddyhoff, Tom
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            – D: 01
              M: 07
              Text: Jul2021
              Type: published
              Y: 2021
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              Value: 156
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            – TitleFull: Mechanical Systems & Signal Processing
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