Model assisted calculations for NDE reliability

Jonne Haapalainen, Esa Leskelä

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

    Abstract

    There are multiple techniques to assess the reliability of non-destructive evaluation (NDE). Probability of detection (POD) curves can be used to find out the smallest flaw that will be detected with a certain probability and receiver operating characteristic (ROC) curves can be used to determine the performance of the amplitude-based classification systems. However, the problem with these techniques is that they require a large number of measurements for good results. In this study, ultrasound simulations were used to generate data for POD and ROC analysis. In total 463 cracks with height from 0.5 mm to 10 mm were simulated. Skew and tilt angles of the cracks were normally distributed random variables with deviation of 5°. From height vs. amplitude data, POD and ROC curves were extracted. Results indicate that due to varying tilt and skew angles, both detectability and classification accuracy decreases due to high variation of the amplitude signal. Moreover, the results show also the capabilities of model assisted probability calculations as a tool to improve NDE methods.
    Original languageEnglish
    Title of host publicationBaltica IX. International Conference on Life Management and Maintenance for Power Plants
    EditorsPertti Auerkari, Juha Veivo
    Place of PublicationEspoo
    PublisherVTT Technical Research Centre of Finland
    Pages611-618
    ISBN (Print)978-951-38-8025-5, 978-951-38-8026-2
    Publication statusPublished - 2013
    MoE publication typeA4 Article in a conference publication
    EventBALTICA IX - International Conference on Life Management and Maintenance for Power Plants - Helsinki-Stockholm, Finland
    Duration: 11 Jun 201313 Jun 2013

    Publication series

    SeriesVTT Technology
    Number106
    ISSN2242-1211

    Conference

    ConferenceBALTICA IX - International Conference on Life Management and Maintenance for Power Plants
    CountryFinland
    CityHelsinki-Stockholm
    Period11/06/1313/06/13

    Fingerprint

    Cracks
    Random variables
    Ultrasonics
    Defects

    Cite this

    Haapalainen, J., & Leskelä, E. (2013). Model assisted calculations for NDE reliability. In P. Auerkari, & J. Veivo (Eds.), Baltica IX. International Conference on Life Management and Maintenance for Power Plants (pp. 611-618). Espoo: VTT Technical Research Centre of Finland. VTT Technology, No. 106
    Haapalainen, Jonne ; Leskelä, Esa. / Model assisted calculations for NDE reliability. Baltica IX. International Conference on Life Management and Maintenance for Power Plants. editor / Pertti Auerkari ; Juha Veivo. Espoo : VTT Technical Research Centre of Finland, 2013. pp. 611-618 (VTT Technology; No. 106).
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    title = "Model assisted calculations for NDE reliability",
    abstract = "There are multiple techniques to assess the reliability of non-destructive evaluation (NDE). Probability of detection (POD) curves can be used to find out the smallest flaw that will be detected with a certain probability and receiver operating characteristic (ROC) curves can be used to determine the performance of the amplitude-based classification systems. However, the problem with these techniques is that they require a large number of measurements for good results. In this study, ultrasound simulations were used to generate data for POD and ROC analysis. In total 463 cracks with height from 0.5 mm to 10 mm were simulated. Skew and tilt angles of the cracks were normally distributed random variables with deviation of 5°. From height vs. amplitude data, POD and ROC curves were extracted. Results indicate that due to varying tilt and skew angles, both detectability and classification accuracy decreases due to high variation of the amplitude signal. Moreover, the results show also the capabilities of model assisted probability calculations as a tool to improve NDE methods.",
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    Haapalainen, J & Leskelä, E 2013, Model assisted calculations for NDE reliability. in P Auerkari & J Veivo (eds), Baltica IX. International Conference on Life Management and Maintenance for Power Plants. VTT Technical Research Centre of Finland, Espoo, VTT Technology, no. 106, pp. 611-618, BALTICA IX - International Conference on Life Management and Maintenance for Power Plants, Helsinki-Stockholm, Finland, 11/06/13.

    Model assisted calculations for NDE reliability. / Haapalainen, Jonne; Leskelä, Esa.

    Baltica IX. International Conference on Life Management and Maintenance for Power Plants. ed. / Pertti Auerkari; Juha Veivo. Espoo : VTT Technical Research Centre of Finland, 2013. p. 611-618 (VTT Technology; No. 106).

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

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    T1 - Model assisted calculations for NDE reliability

    AU - Haapalainen, Jonne

    AU - Leskelä, Esa

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    N2 - There are multiple techniques to assess the reliability of non-destructive evaluation (NDE). Probability of detection (POD) curves can be used to find out the smallest flaw that will be detected with a certain probability and receiver operating characteristic (ROC) curves can be used to determine the performance of the amplitude-based classification systems. However, the problem with these techniques is that they require a large number of measurements for good results. In this study, ultrasound simulations were used to generate data for POD and ROC analysis. In total 463 cracks with height from 0.5 mm to 10 mm were simulated. Skew and tilt angles of the cracks were normally distributed random variables with deviation of 5°. From height vs. amplitude data, POD and ROC curves were extracted. Results indicate that due to varying tilt and skew angles, both detectability and classification accuracy decreases due to high variation of the amplitude signal. Moreover, the results show also the capabilities of model assisted probability calculations as a tool to improve NDE methods.

    AB - There are multiple techniques to assess the reliability of non-destructive evaluation (NDE). Probability of detection (POD) curves can be used to find out the smallest flaw that will be detected with a certain probability and receiver operating characteristic (ROC) curves can be used to determine the performance of the amplitude-based classification systems. However, the problem with these techniques is that they require a large number of measurements for good results. In this study, ultrasound simulations were used to generate data for POD and ROC analysis. In total 463 cracks with height from 0.5 mm to 10 mm were simulated. Skew and tilt angles of the cracks were normally distributed random variables with deviation of 5°. From height vs. amplitude data, POD and ROC curves were extracted. Results indicate that due to varying tilt and skew angles, both detectability and classification accuracy decreases due to high variation of the amplitude signal. Moreover, the results show also the capabilities of model assisted probability calculations as a tool to improve NDE methods.

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    Haapalainen J, Leskelä E. Model assisted calculations for NDE reliability. In Auerkari P, Veivo J, editors, Baltica IX. International Conference on Life Management and Maintenance for Power Plants. Espoo: VTT Technical Research Centre of Finland. 2013. p. 611-618. (VTT Technology; No. 106).