Reliability Analysis of Ship Designed Controller

Reliability Analysis of Ship Designed Controller

Effective control of ships in a designed trajectory is always an important task for ship maneuvering. Because of the model parameters uncertainty and external disturbances such as waves, winds and ocean currents, in this paper the robust H∞ controller is designed for a container ship. The aim of this paper is to apply the well known methodology of reliability analysis in order to evaluate the reliability of designed H∞ controller for the container ship to achieve the predefined heading angle overshoot (less than 20%) in way-point tracking. For this purpose three random variables characterizing wind speed, wind direction and wave direction are considered as the inputs because these affect overshoot more than the other variables. The results show the ability of the designed controller to compensate the effects of timevarying disturbances in way point tracking control.