In modern technology the trend toward thinner and lighter structures is predominant. This leads to a high flexibility of the systems, which in many cases involve large capacity containers for liquid or propellant storage, such as in storage tanks or containers in airplanes, missiles, space vehicles, satellites or space stations. Strong interactions of this propellant with the control system and the elastic structure may appear, endangering the integrity of the system and the success of the mission. Thus, shifting these instability frequencies is usually the only way to remedy the troublesome problem. This may be achieved by considering the free liquid surface with a flexible structural member, such as a membrane or a thin elastic plate, with various possible boundary conditions. In this way a coupled frequency system is considered, possibly showing frequencies away from the dangerous one of the original system. If the surface of a viscous liquid is completely covered by an elastic structure, the hydroelastic frequencies are shifted to a larger magnitude than those obtained with a free surface. It was found that viscosity decreases the oscillation frequencies in comparison to the coupled hydroelastic frequencies of frictionless liquid and that a new phenomenon appears, exhibiting for certain liquid height ranges h/a only aperiodic motion. With increasing angular and radial mode numbers these aperiodic ranges of h/a decrease. Higher modes show larger damping. An increase in the membrane tension decreases the aperiodic region, while an increase in the mass of the membrane increases it.


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    Title :

    Hydroelastic viscous oscillations in a circular cylindrical container with an elastic cover


    Additional title:

    Hydroelastische viskose Schwingungen in einem kreiszylinderförmigen Tank mit elastischer Abdeckung


    Contributors:
    Bauer, H.F. (author) / Chiba, M. (author)

    Published in:

    Publication date :

    2000


    Size :

    20 Seiten, 13 Bilder, 28 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English






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