Modal testing and FE-model validation of azimuthing thruster

Vesa Nieminen, Matti Tervonen

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

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    Abstract

    Vibratory behavior of an azimuthing thruster was studied with FE-models and the results were verified by full-scale experiments. Studied thruster systems are used both for main propulsion and for steering of vessels. Modeling techniques were developed to take into account the most significant factors and phenomena affecting on the vibration behavior of the structure in real operation conditions. Modeling of structural properties such as bearings, hydraulic steering system, electro-mechanical interaction and rotor dynamics were investigated. The FE-model included also a part of the ship structure. Influence of the surrounding water on the vibration behavior was also studied. A combined FE-model for the structure and surrounding water were constructed and natural frequencies and modes were calculated. Vibration measurements were conducted in dry dock as well as during normal ship operations. Modal parameters in air and in water during operations were determined experimentally. In water the excitation came from ice block impacts and the modal parameters were estimated by Operational Modal Analysis. Operational Deflection Shape analysis was also utilized. Differences between the calculated and experimentally determined modal parameters in air were found to be small. The calculated global natural frequencies in water also corresponded reasonably well with the measured ones.
    Original languageEnglish
    Title of host publicationConference Proceedings of the Society for Experimental Mechanics Series
    EditorsT. Proulx
    PublisherSpringer
    Pages1-18
    Volume2
    ISBN (Electronic)978-1-4419-9305-2
    ISBN (Print)978-1-4419-9304-5
    DOIs
    Publication statusPublished - 2011
    MoE publication typeA4 Article in a conference publication

    Fingerprint

    Testing
    Water
    Natural frequencies
    Ships
    Bearings (structural)
    Drydocks
    Vibration measurement
    Modal analysis
    Air
    Propulsion
    Ice
    Structural properties
    Rotors
    Hydraulics
    Experiments

    Cite this

    Nieminen, V., & Tervonen, M. (2011). Modal testing and FE-model validation of azimuthing thruster. In T. Proulx (Ed.), Conference Proceedings of the Society for Experimental Mechanics Series (Vol. 2, pp. 1-18). Springer. https://doi.org/10.1007/978-1-4419-9305-2_1
    Nieminen, Vesa ; Tervonen, Matti. / Modal testing and FE-model validation of azimuthing thruster. Conference Proceedings of the Society for Experimental Mechanics Series. editor / T. Proulx. Vol. 2 Springer, 2011. pp. 1-18
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    abstract = "Vibratory behavior of an azimuthing thruster was studied with FE-models and the results were verified by full-scale experiments. Studied thruster systems are used both for main propulsion and for steering of vessels. Modeling techniques were developed to take into account the most significant factors and phenomena affecting on the vibration behavior of the structure in real operation conditions. Modeling of structural properties such as bearings, hydraulic steering system, electro-mechanical interaction and rotor dynamics were investigated. The FE-model included also a part of the ship structure. Influence of the surrounding water on the vibration behavior was also studied. A combined FE-model for the structure and surrounding water were constructed and natural frequencies and modes were calculated. Vibration measurements were conducted in dry dock as well as during normal ship operations. Modal parameters in air and in water during operations were determined experimentally. In water the excitation came from ice block impacts and the modal parameters were estimated by Operational Modal Analysis. Operational Deflection Shape analysis was also utilized. Differences between the calculated and experimentally determined modal parameters in air were found to be small. The calculated global natural frequencies in water also corresponded reasonably well with the measured ones.",
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    Nieminen, V & Tervonen, M 2011, Modal testing and FE-model validation of azimuthing thruster. in T Proulx (ed.), Conference Proceedings of the Society for Experimental Mechanics Series. vol. 2, Springer, pp. 1-18. https://doi.org/10.1007/978-1-4419-9305-2_1

    Modal testing and FE-model validation of azimuthing thruster. / Nieminen, Vesa; Tervonen, Matti.

    Conference Proceedings of the Society for Experimental Mechanics Series. ed. / T. Proulx. Vol. 2 Springer, 2011. p. 1-18.

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

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    AB - Vibratory behavior of an azimuthing thruster was studied with FE-models and the results were verified by full-scale experiments. Studied thruster systems are used both for main propulsion and for steering of vessels. Modeling techniques were developed to take into account the most significant factors and phenomena affecting on the vibration behavior of the structure in real operation conditions. Modeling of structural properties such as bearings, hydraulic steering system, electro-mechanical interaction and rotor dynamics were investigated. The FE-model included also a part of the ship structure. Influence of the surrounding water on the vibration behavior was also studied. A combined FE-model for the structure and surrounding water were constructed and natural frequencies and modes were calculated. Vibration measurements were conducted in dry dock as well as during normal ship operations. Modal parameters in air and in water during operations were determined experimentally. In water the excitation came from ice block impacts and the modal parameters were estimated by Operational Modal Analysis. Operational Deflection Shape analysis was also utilized. Differences between the calculated and experimentally determined modal parameters in air were found to be small. The calculated global natural frequencies in water also corresponded reasonably well with the measured ones.

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    Nieminen V, Tervonen M. Modal testing and FE-model validation of azimuthing thruster. In Proulx T, editor, Conference Proceedings of the Society for Experimental Mechanics Series. Vol. 2. Springer. 2011. p. 1-18 https://doi.org/10.1007/978-1-4419-9305-2_1