A STUDY ON A NEW TYPE OF SLOSHING DAMPER IN WHICH POTENTIAL ENERGY IS DISSIPATED

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In this research a new type of sloshing damper is proposed where a part of the potential energy due to the surface elevation is not converted into the kinetic energy to increase the fluid velocity by setting sub-spaces with bottom leak holes and one-way valves to container wall, and its damping characteristics are systematically studied for the case of sloshing in rectangular containers by numerical simulations. The summary of the research results is as follows.(1) The mathematical models are introduced to describe coupled fluid oscillations between the sloshing in the main rectangular container and the motion of surface elevation in the sub-spaces, which act as the potential energy consuming dampers.(2) The damping effects of the sub-spaces are studied by numerical simulations. At first, the resonant characteristics of sloshing are calculated in the case where no sub-spaces are equipped. Then, the series of numerical calculations are conducted, for the cases where the diameters of bottom leak holes are changed while the volume of sub-spaces and the area of the one-way valves are both kept constant. As a result, it is confirmed that there exists the most suitable diameter for the leak holes for given volume of the sub-spaces and area of the one-way valves. This fact shows one of the most important characteristics of the potential energy consuming dampers and also shows that this type of dampers could be applicable to many kinds of fluid oscillations.