Simulation comparison between separate and combined control methods of anti-rolling system based on MFAC

Simulations are given for the anti-rolling effects between fin stabilizer, anti-rolling tank control, and fin/anti-roll tank combined stabilization. Results show that the last design strategy gives much better performance than the two single dynamics strategies (fin or anti-roll tank), and can provide us a full-condition anti-rolling system. The nonlinearity and randomicity of the ship rolling motivates us to adopt a model-free adaptive control (MFAC) method in the designing of the anti-roll stabilization controller. MFAC controller only uses I/O data and exact mathematic model is not needed priorly. Systems including the MFAC controller have high adaptability in various sea situations, less adjustable parameters, and less computation requirement. Based on MFAC method, the fin/anti-roll tank combined stabilizer can be suitable for the navigation control of big ships in complex sea conditions.