An Application of Fuzzy Control Theory in Dynamic Positioning System

概要

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In this paper, an attempt is introduced which applied the fuzzy control principle to the dynamic positioning (DP) system. In order to apply the advantages of fuzzy control such as quick calculation, simple construction, and ease operation of logic conditional statements to the DP system, overcome the weak point of the difficulty to decide the control coefficients in PID control system, a computer simulation system of dynamic positioning with fuzzy controller (FDP) is set up. Instead of conventional MAX-MIN operation, triangular norms is led into calculation of the fuzzy relation in the chosen fuzzy control model so as to avoid neglecting the characteristics of every fuzzy element and make the model work better. In order to examine the feasibility of the FDP system and show its properties, the simulations of a model of tanker floating on the sea in the conditions of wind, irregular waves, and current are carried out. And the results are compared with the ones of model tests with PID control system of J. A. Pinkster et al. The results of simulations show that the FDP system is easy to establish the control model, quick to operate, and has better control effect than the PID-DP system although former needs lower maximum delivering power of thruster.
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