PARAMETRIC ROLL PREVENTING APPARATUS AND METHOD FOR VESSEL

A parametric roll preventing apparatus for a vessel and a method thereof are provided to safely protect the vessel and a cargo from parametric roll by performing a feedback control to suppress or reduce the parametric roll. A parametric roll preventing apparatus for a vessel includes a rudder(5), a steering device(4), an auto pilot(3), and a wave monitoring device(12a). The rudder is installed at a stern of the vessel. The steering device operates steering of the rudder. The auto pilot transmits an operation command to the steering device by an operation variable auto pilot rudder angle(deltayaw). The wave monitoring device monitors a wave during sailing of the vessel. The parametric roll preventing apparatus for the vessel further includes a control computer(10), a communication converter(20), and a roll measuring device(15a). The control computer checks a cause condition of parametric roll by using wave information inputted through a wave monitoring unit and navigation information inputted through a navigation condition monitoring unit. The control computer predicts the parametric roll by using a parametric roll DB(19) of the vessel and controls the steering device by an operation variable rudder angle(deltaroll). The communication converter is connected to the control computer and performs signal conversion and communication. The roll measuring device measures a roll angular and roll angle speed and transmits the measured roll angle and roll angular speed to the control computer through the communication converter.