Mobility of the diesel engine base of a RO-RO ship

Paul Klinge

    Research output: Book/ReportReport

    Abstract

    The mobilities of the engine base of a RO-RO ship were calculated with two FE models in frequency ranges 0 - 100 Hz and 100 - 200 Hz. The mobilities of the same engine base with the engines mounted have been measured on the ship and the diesel engine has been measured alone. Also the suitability of FE programs and the traditional calculation method was of interest in this study. In principle the mode superposition method should have worked well and with minimum manual work. However, at every step during the calculation starting from the modelling of the geometry the automatic functions failed due to the large size of the model causing much more manual work than expected. This makes it in practice impossible to use FE programs with the kind of limitations as I-Deas to calculate the mobilities up to required high frequencies. On the other hand the high natural mode density at high frequencies makes the use of the traditional mode superposition method questionable. It can be estimated that in the CPU time, which was used to calculate the natural modes, about 100 direct solutions could have been calculated. Thus for this kind of calculations the feasibility of the direct solution method should be studied.
    Original languageEnglish
    PublisherVTT Technical Research Centre of Finland
    Number of pages24
    Publication statusPublished - 2002
    MoE publication typeD4 Published development or research report or study

    Publication series

    SeriesVTT Manufacturing Technology. Research Report
    NumberBVAL35-011179

    Fingerprint

    Diesel engines
    Ships
    Engines
    Program processors
    Geometry

    Keywords

    • ships

    Cite this

    Klinge, P. (2002). Mobility of the diesel engine base of a RO-RO ship. VTT Technical Research Centre of Finland. VTT Manufacturing Technology. Research Report, No. BVAL35-011179
    Klinge, Paul. / Mobility of the diesel engine base of a RO-RO ship. VTT Technical Research Centre of Finland, 2002. 24 p. (VTT Manufacturing Technology. Research Report; No. BVAL35-011179).
    @book{43a26d88aa244483b9d2a731ab4bb61b,
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    abstract = "The mobilities of the engine base of a RO-RO ship were calculated with two FE models in frequency ranges 0 - 100 Hz and 100 - 200 Hz. The mobilities of the same engine base with the engines mounted have been measured on the ship and the diesel engine has been measured alone. Also the suitability of FE programs and the traditional calculation method was of interest in this study. In principle the mode superposition method should have worked well and with minimum manual work. However, at every step during the calculation starting from the modelling of the geometry the automatic functions failed due to the large size of the model causing much more manual work than expected. This makes it in practice impossible to use FE programs with the kind of limitations as I-Deas to calculate the mobilities up to required high frequencies. On the other hand the high natural mode density at high frequencies makes the use of the traditional mode superposition method questionable. It can be estimated that in the CPU time, which was used to calculate the natural modes, about 100 direct solutions could have been calculated. Thus for this kind of calculations the feasibility of the direct solution method should be studied.",
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    Klinge, P 2002, Mobility of the diesel engine base of a RO-RO ship. VTT Manufacturing Technology. Research Report, no. BVAL35-011179, VTT Technical Research Centre of Finland.

    Mobility of the diesel engine base of a RO-RO ship. / Klinge, Paul.

    VTT Technical Research Centre of Finland, 2002. 24 p. (VTT Manufacturing Technology. Research Report; No. BVAL35-011179).

    Research output: Book/ReportReport

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    AU - Klinge, Paul

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    AB - The mobilities of the engine base of a RO-RO ship were calculated with two FE models in frequency ranges 0 - 100 Hz and 100 - 200 Hz. The mobilities of the same engine base with the engines mounted have been measured on the ship and the diesel engine has been measured alone. Also the suitability of FE programs and the traditional calculation method was of interest in this study. In principle the mode superposition method should have worked well and with minimum manual work. However, at every step during the calculation starting from the modelling of the geometry the automatic functions failed due to the large size of the model causing much more manual work than expected. This makes it in practice impossible to use FE programs with the kind of limitations as I-Deas to calculate the mobilities up to required high frequencies. On the other hand the high natural mode density at high frequencies makes the use of the traditional mode superposition method questionable. It can be estimated that in the CPU time, which was used to calculate the natural modes, about 100 direct solutions could have been calculated. Thus for this kind of calculations the feasibility of the direct solution method should be studied.

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    Klinge P. Mobility of the diesel engine base of a RO-RO ship. VTT Technical Research Centre of Finland, 2002. 24 p. (VTT Manufacturing Technology. Research Report; No. BVAL35-011179).