Abstract
A waveform of a water surface caused by water sloshing in a rectangle tank often changes because of nonlinear effect of fluid. In the case of a small water depth, shallow water wave theory can be applied to this phenomenon. Then we propose a sloshing prevention control method using concentrated mass model and moving plate. This model consists of masses, connecting linear springs and connecting dampers. In this control method, the liquid of the container is formulated by the concentrated mass model and a displacement of the moving plate is obtained by optimal regulator. The effectiveness of the proposed method is confirmed by a numerical simulation.