Research on active heave compensation for offshore crane

Heave compensation system is a new type of automatic control system accompanied by increasing offshore operation; its main purpose is to ensure marine equipment operation not affected by undulating limits, which can normally work under adverse sea conditions. This paper proposes a detection system with high performance, high precision control algorithm of the active heave compensation system, through a certain drive hydraulic system to heave compensation control strategy, make the crane heave motion of the amplitude of the heave motion of the ship amplitude greatly reduce, can overcome the ship due to the wave action in bad sea condition and the roll motion, trim movement, heave movement and the movement coupling influence each other, to maintain relatively stable and motion of the ship. This article presents the working principle of the heave compensation system, describes in detail the key technology of this kind of compensation system. To enhance control accuracy and disturbance resisting ability, fuzzy-PI controller for the parameter self-adjusting has been adopted in this system. The results of experiment show that this controller can make the compensation speed be automatically-controlled efficiently, and has a higher control accuracy, better disturbance-resisting ability, less sensitive to parameter changes, and better robustness.