The proper design estimate of stiffened plates is very important because they are one of the most basic structutal elements of a ship hull. Since stiffened plates such as walls in a tank are immersed in water or other kinds of liquid, their natural frequencies tend to decrease and often become resonant with the exciting force due to a propeller or a main engine. In many cases, the scantlings of stiffened plates are increased to avoid resonant vibrations. We developed a computer program for the vibration analysis of rectangular stiffened plates in water, and we obtained a good agreement between calculations and experiments. According to those results and adding some other calculations, we are discussing here a simple method to estimate the virtual mass of immersed stiffened plates. We performed a vibration analysis of aft-peak tank floor using NASTRAN as an example. The result showed a possibility of large reduction in natural frequency for the floor vibrating in water. (Wassmann)


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    Title :

    On the estimation of virtual mass of stiffened plates vibrating in water


    Additional title:

    Ueber die Abschaetzung der virtuellen Masse von versteiften Platten, die in Wasser schwingen


    Contributors:
    Kondo, K. (author) / Toyofuku, M. (author)


    Publication date :

    1980


    Size :

    8 Seiten, 15 Bilder, 5 Tabellen, 4 Quellen


    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




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