The wave motion of fluids in finite containers, called slosh, isknown to have adverse effects on the dynamics of aerospace vehicles andtanker trucks as well as on large storage tanks during earthquakes. Thispaper investigates slosh from an active feedback control perspective,and considers two possible active control methods for attenuating theresponse of the fluid to an external disturbance acceleration acting onthe tank. The first method uses surface pressure control, whereas thesecond method uses a flap actuator on the surface of the fluid. In thefirst part of the paper we derive a state space model of slosh in a tankof rectangular cross section. This model is then used to design feedbackcontrollers using LQG synthesis, and simulation results are presented todemonstrate the closed-loop performance
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