A detailed experimental modal analysis of a clamped circular plate

D. Matthews, Hongmei Sun, K. Saltmarsh, D.R. Wilkes, A. Munyard, Jie Pan

    Research output: Chapter in Book/Conference paperConference paper

    5 Citations (Scopus)

    Abstract

    A detailed study has been made of the natural frequencies and modal shapes of a thin steel disc that is clamped at the edges by two steel flanges. The aim was to determine how accurately numerical modeling could be used to predict the results and to investigate the possibility of any new experimental observations even for this simple structure. A mechanical shaker and impact hammer were used to excite the plate to obtain the frequency response function of the structure. The first eight modal shapes at each of the resonant frequencies were then measured using laser scanning vibrometry. These results were compared with theoretical results obtained analytically and numerically using PAFEC. While part of the existing understanding of the plate vibration was confirmed, significant differences were found in the values of the modal frequencies. The experimental data also demonstrated a dependence of the mode shape orientations and splitting of degenerated natural frequencies on the shaker position and properties of the flanges. This paper will report on some interesting effects that need to be considered when doing such measurements and illustrate the risks of using numerical modeling without the use of experimental comparison.
    Original languageEnglish
    Title of host publicationProceedings of 43rd International Congress on Noise Control Engineering
    Place of PublicationAustralia
    PublisherAustralian Acoustical Society
    Pages1-9
    Volume1
    ISBN (Print)9780909882037
    Publication statusPublished - 2014
    Event43rd International Congress on Noise Control Engineering: Improving the World Through Noise Control - Melbourne, Australia
    Duration: 16 Nov 201419 Nov 2014

    Conference

    Conference43rd International Congress on Noise Control Engineering: Improving the World Through Noise Control
    CountryAustralia
    CityMelbourne
    Period16/11/1419/11/14

    Fingerprint

    circular plates
    resonant frequencies
    flanges
    steels
    hammers
    modal response
    frequency response
    vibration
    scanning
    lasers

    Cite this

    Matthews, D., Sun, H., Saltmarsh, K., Wilkes, D. R., Munyard, A., & Pan, J. (2014). A detailed experimental modal analysis of a clamped circular plate. In Proceedings of 43rd International Congress on Noise Control Engineering (Vol. 1, pp. 1-9). Australia: Australian Acoustical Society.
    Matthews, D. ; Sun, Hongmei ; Saltmarsh, K. ; Wilkes, D.R. ; Munyard, A. ; Pan, Jie. / A detailed experimental modal analysis of a clamped circular plate. Proceedings of 43rd International Congress on Noise Control Engineering. Vol. 1 Australia : Australian Acoustical Society, 2014. pp. 1-9
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    title = "A detailed experimental modal analysis of a clamped circular plate",
    abstract = "A detailed study has been made of the natural frequencies and modal shapes of a thin steel disc that is clamped at the edges by two steel flanges. The aim was to determine how accurately numerical modeling could be used to predict the results and to investigate the possibility of any new experimental observations even for this simple structure. A mechanical shaker and impact hammer were used to excite the plate to obtain the frequency response function of the structure. The first eight modal shapes at each of the resonant frequencies were then measured using laser scanning vibrometry. These results were compared with theoretical results obtained analytically and numerically using PAFEC. While part of the existing understanding of the plate vibration was confirmed, significant differences were found in the values of the modal frequencies. The experimental data also demonstrated a dependence of the mode shape orientations and splitting of degenerated natural frequencies on the shaker position and properties of the flanges. This paper will report on some interesting effects that need to be considered when doing such measurements and illustrate the risks of using numerical modeling without the use of experimental comparison.",
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    Matthews, D, Sun, H, Saltmarsh, K, Wilkes, DR, Munyard, A & Pan, J 2014, A detailed experimental modal analysis of a clamped circular plate. in Proceedings of 43rd International Congress on Noise Control Engineering. vol. 1, Australian Acoustical Society, Australia, pp. 1-9, 43rd International Congress on Noise Control Engineering: Improving the World Through Noise Control, Melbourne, Australia, 16/11/14.

    A detailed experimental modal analysis of a clamped circular plate. / Matthews, D.; Sun, Hongmei; Saltmarsh, K.; Wilkes, D.R.; Munyard, A.; Pan, Jie.

    Proceedings of 43rd International Congress on Noise Control Engineering. Vol. 1 Australia : Australian Acoustical Society, 2014. p. 1-9.

    Research output: Chapter in Book/Conference paperConference paper

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    AB - A detailed study has been made of the natural frequencies and modal shapes of a thin steel disc that is clamped at the edges by two steel flanges. The aim was to determine how accurately numerical modeling could be used to predict the results and to investigate the possibility of any new experimental observations even for this simple structure. A mechanical shaker and impact hammer were used to excite the plate to obtain the frequency response function of the structure. The first eight modal shapes at each of the resonant frequencies were then measured using laser scanning vibrometry. These results were compared with theoretical results obtained analytically and numerically using PAFEC. While part of the existing understanding of the plate vibration was confirmed, significant differences were found in the values of the modal frequencies. The experimental data also demonstrated a dependence of the mode shape orientations and splitting of degenerated natural frequencies on the shaker position and properties of the flanges. This paper will report on some interesting effects that need to be considered when doing such measurements and illustrate the risks of using numerical modeling without the use of experimental comparison.

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    Matthews D, Sun H, Saltmarsh K, Wilkes DR, Munyard A, Pan J. A detailed experimental modal analysis of a clamped circular plate. In Proceedings of 43rd International Congress on Noise Control Engineering. Vol. 1. Australia: Australian Acoustical Society. 2014. p. 1-9