HYDROELASTIC VISCOUS OSCILLATIONS IN A CIRCULAR CYLINDRICAL CONTAINER WITH AN ELASTIC COVER |
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| Affiliation: | 1. Institut für Raumfahrttechnik, Universität der Bundeswehr München, 85577, Neubiberg, Germany;2. Department of Mechanical Engineering, Iwate University, Morioka, 020-8551, Japan;1. School of Materials Science and Engineering, University of Jinan, Jinan, 250022, PR China;2. Shandong Provincial Key Laboratory for Special Silicon-containing Material, Advanced Materials Institute, Qilu University of Technology (Shandong Academy of Sciences), Jinan, 250014, PR China;1. Graduate School of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, 305-8573, Japan;2. Faculty of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, 305-8573, Japan;1. Department of Civil Engineering, Indian Institute of Technology Gandhinagar, Gandhinagar 382355, India;2. MCEER and the Department of Civil, Structural and Environmental Engineering, University at Buffalo, Buffalo, NY 14260, United States |
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| Abstract: | 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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