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A time-domain ultrasonic approach for oil film thickness measurement with improved resolution and range.

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Title: A time-domain ultrasonic approach for oil film thickness measurement with improved resolution and range.
Authors: Dou, Pan (AUTHOR) wt-h@163.com, Wu, Tonghai (AUTHOR), Peng, Zhongxiao (AUTHOR)
Source: Measurement Science & Technology. Jul2020, Vol. 31 Issue 7, p1-12. 12p.
Subjects: Thickness measurement, Petroleum, Interpolation
Abstract: The ultrasonic-based method has been proved to be a practical technique for measuring oil film thickness in the enclosed tribo-pair of a supporting bearing and under dynamic conditions. To cope with the large-scale variations of oil film thickness in engineering applications, frequency-domain based models, being adaptive for different measurement ranges, are widely used. As an improvement, the time-domain approach can further expand the effective range, but suffers from decreased resolution in oil thickness measurement. To address these issues, this paper proposes a unified time-domain model for full-range measurement. First, a cluster of standard echoes with definite film thicknesses in a wide range are pre-constructed, and they are matched with measured echoes to find the most suitable oil film thickness. Further, an optimized interpolation is applied to both the constructed and the measured echoes for better resolution. Aiming for the lowest interpolation error, the windowed sinc function was employed optimally. Using a precision calibration rig, the proposed model was compared to the traditional frequency-domain and the time-domain models. The comparison demonstrates that the proposed model has a larger effective measurement range, covering those of all traditional frequency-domain models and with equal accuracies. In addition, the proposed model shows both a wider effective range and a higher resolution than that of the reference time-domain model. This work contributes to the development of on-line continuous measurement of oil film thickness variation at a large scale. [ABSTRACT FROM AUTHOR]
Copyright of Measurement Science & Technology is the property of IOP Publishing 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: 143419413
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
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  Data: A time-domain ultrasonic approach for oil film thickness measurement with improved resolution and range.
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  Data: <searchLink fieldCode="AR" term="%22Dou%2C+Pan%22">Dou, Pan</searchLink> (AUTHOR)<i> wt-h@163.com</i><br /><searchLink fieldCode="AR" term="%22Wu%2C+Tonghai%22">Wu, Tonghai</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Peng%2C+Zhongxiao%22">Peng, Zhongxiao</searchLink> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Measurement+Science+%26+Technology%22">Measurement Science & Technology</searchLink>. Jul2020, Vol. 31 Issue 7, p1-12. 12p.
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  Data: <searchLink fieldCode="DE" term="%22Thickness+measurement%22">Thickness measurement</searchLink><br /><searchLink fieldCode="DE" term="%22Petroleum%22">Petroleum</searchLink><br /><searchLink fieldCode="DE" term="%22Interpolation%22">Interpolation</searchLink>
– Name: Abstract
  Label: Abstract
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  Data: The ultrasonic-based method has been proved to be a practical technique for measuring oil film thickness in the enclosed tribo-pair of a supporting bearing and under dynamic conditions. To cope with the large-scale variations of oil film thickness in engineering applications, frequency-domain based models, being adaptive for different measurement ranges, are widely used. As an improvement, the time-domain approach can further expand the effective range, but suffers from decreased resolution in oil thickness measurement. To address these issues, this paper proposes a unified time-domain model for full-range measurement. First, a cluster of standard echoes with definite film thicknesses in a wide range are pre-constructed, and they are matched with measured echoes to find the most suitable oil film thickness. Further, an optimized interpolation is applied to both the constructed and the measured echoes for better resolution. Aiming for the lowest interpolation error, the windowed sinc function was employed optimally. Using a precision calibration rig, the proposed model was compared to the traditional frequency-domain and the time-domain models. The comparison demonstrates that the proposed model has a larger effective measurement range, covering those of all traditional frequency-domain models and with equal accuracies. In addition, the proposed model shows both a wider effective range and a higher resolution than that of the reference time-domain model. This work contributes to the development of on-line continuous measurement of oil film thickness variation at a large scale. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Measurement Science & Technology is the property of IOP Publishing 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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        Value: 10.1088/1361-6501/ab7a69
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      – Code: eng
        Text: English
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        PageCount: 12
        StartPage: 1
    Subjects:
      – SubjectFull: Thickness measurement
        Type: general
      – SubjectFull: Petroleum
        Type: general
      – SubjectFull: Interpolation
        Type: general
    Titles:
      – TitleFull: A time-domain ultrasonic approach for oil film thickness measurement with improved resolution and range.
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            NameFull: Dou, Pan
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            NameFull: Wu, Tonghai
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              M: 07
              Text: Jul2020
              Type: published
              Y: 2020
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