Nonlinear Dynamics of the Combined Motion of a Tank and a Fluid Partially Filling It

The nonlinear oscillations of a tank partially filled with a fluid under a horizontal harmonic force are studied. The generation of waves on the free liquid surface is studied using a nonlinear multimode (twelve modes) model that describes the combined motion of the tank and the fluid under external forces. It is shown that the oscillations of the system do not reach a steady state in classical sense, which is confirmed experimentally. Using an advanced model reveals a multi-frequency dynamic process, effect of high-frequency modes, and shift of the frequencies of antisymmetric modes