Identification Of Added Mass And Added Damping Coefficient For An Underwater Shaking Table Based On Gradient Algorithm

The underwater shaking table, the key experimental facility for underwater vibration simulation, is used to test the underwater seismic behaviors and vibration characteristics of the underwater equipment such as underwater civil engineering structures and the submarine production system. However, unlike the normal electro-hydraulic servo shaking table, the special working environment of the underwater shaking table brings many difficulties to its design. One of the key issues is that the added mass and the added damping coefficient caused by the fluid-solid coupling problem between the shaking table and the fluid should be considered. These will reduce the bandwidth of the system and low er the system stability to a great extent. In this paper, the FLUENT software and the dynamic meshing technology are applied to establish the finite element model of the underwater shaking table and its fluid domain. Finally, the added mass and the added damping coefficient of the underwater shaking table are identified by using the gradient algorithm. The simulation results show that both the added mass and the added damping coefficient are precisely identified.