Structures such as an elastic beam in an annular flow begin to vibrate due to the annular flow. Furthermore, the flow-induced vibration becomes larger. In this paper, the stabilization of an axisymmetric elastic beam subjected to an annular flow by acting the control input on the fluid-structure coupled system is investigated. The coupled equation, based on the Euler-Bernoulli type of partial differential equation and the Navier Stokes equation, is derived with control terms. In this paper, a piezoelectric actuator is used to control the coupled system. By applying the optimal control law to the coupled system, the unstable behavior is stabilized. Numerical studies are performed to investigate the efficiency of the proposed control method and the effect of the position of the actuator on the control performance.

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