Abstract
The free liquid surface in a cylindrical container exhibits in zero-gravity a spherical surface, which form depends upon the magnitude of the contact angles of the liquid surface to the container wall. For these surface geometries the interaction of the liquid with a flexible tank bottom has been investigated. The bottom was considered as a flexible membrane or a thin elastic plate. For both cases, the coupled frequencies have been determined. It was found that a more flexible container bottom changes the coupled liquid frequencies, a fact which is pronounced for small liquid heights. Larger liquid heights have a small effect on the coupled liquid frequencies, but a strong effect on the coupled membrane (plate) frequencies.
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