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Abstract
When ships are sailing on the sea, pitch motion will greatly reduce the safety of ships and cargo, as well as the health of the crew. To reduce the effect of pitch motion of the ship. In this paper, a new control method to reduce the ship's pitch motion is proposed based on the quadratic linear control method. A mathematical model of the ship's pitch motion is given considering the disturbances acting on the system as the basis for the controller design. The state of the system is estimated by Kalman filter, and then the system is controlled by the optimal control method. Finally, the simulation results using Matlab software show that using the LQG control method to achieve the ability to reduce the ship's pitch motion is feasible, the results show the effectiveness of the given control method and the system controller is designed.