List Control Rudder Roll Stabilization
Rudder Roll Stabilization --An alternative to active fins:
Roll stabilization by means of a ship's rudder (RRS) was first designed and marketed by SSPA of Sweden. The system designed by Schultz Engineering for Hyde Marine Systems utilizes SSPA's algorithm (under license) with modern microprocessor and display technology.
RRS is attractive for several reasons: (1) Every ship has a rudder, no new external control surfaces need to be installed. (2) The installation of active fins often increases the beam or draft of the vessel. (3) The additional drag caused by control surfaces such as fins often cause the ship's top speed to decrease and its the fuel costs to increase. (4) The installation of active fins requires space, often at the expense of cargo or passenger space.
On the other hand: (1) RRS will not work on every ship. (2) Active Fins will always work better than RRS. But, for ships on which roll stabilization technology is being retrofitted, RRS can be especially attractive economically.
RRS works by moving the ship's rudder rapidly to provide roll damping in response to roll motions. Vessel steering is usually not affected because ships change direction slowly in response to changes in rudder angle. The RRS System, therefore, combines its roll damping function with a steering (autopilot) function for the ship.
To read the article "Application of Roll Damping Systems to Search and Rescue Vessels" Click Here