Design of hybrid marine control systems for dynamic positioning

NGUYEN TRONG DONG

Publication

Design of hybrid marine control systems for dynamic positioning

NGUYEN TRONG DONG

Abstract

It is not efficient to have a wide operational window using a single-controller system for the various operations of marine vessels. Therefore, this thesis develops a hybrid-controller system for marine control, integrating dynamic positioning (DP), maneuvering and transit operations in varying environmental conditions. Manually switched hybrid marine control system integrating functions for DP, low speed maneuvering and transit operations was developed theoretical and experimentally. Automatically switched hybrid control adopting the concept of supervisory switching was developed for DP system in calm to extreme seas. This hybrid control system integrates the output PID with wave filtering for normal seas and AFB without wave filtering for extreme sea. Stability analysis, numerical simulations and experiments for the proposed hybrid control were provided. The results showed that the hybrid control system can expand the weather window for DP system to extreme conditions.