<p>Vibrations of the cylindrical panel in the viscous fluid under the action of impulse load in the form of the sharp displacement of its foundation have been studied. Approaches to solving coupled problems of solid mechanics and hydrogas dynamics have been used. The vibration processes for different cross-sections of the cylindrical panel with different radii have been compared. Vibration amplitude for the panel with smaller radius is reduced, and the results differ significantly from those for larger radius variants. It has been determined that the viscous medium acts as a damper for the vibration processes of the panel.</p>