Research On Hydraulic Cylinder-type Active Heave Compensation System For Ship Crane

Ship cranes can be affected by sea waves when they are working on the sea. It can bring about six freedom degrees movement, the safety and stability of offshore crane can be seriously affected by the heave motion. The heave compensation system is used to reduce the impact of heave motion. So it is great significant to design new active heave compensation system with high compensation accuracy and low energy consumption (NAHC).According to the low compensation accuracy of passive heave compensation system (PHC) and high energy consumption of active heave compensation system (AHC),based on simulation analysis of AMEsim and Matlab software, hydraulic cylinder-type active heave compensation system is studied in this paper. The best form of the system and control mode is designed, mathematical modeling and joint simulation for the system is established.The main research contents of this paper are as follows:(1) Different systems of PHC, AHC and NAHC are evaluated. Hydraulic schematics and AMEsim models are designed. Simulation results indicate NAHC system can have lower energy consumption and higher compensation accuracy.(2) The schemes of paralleled cylinder, series cylinder, conventional cylinder and composite cylinder are designed. Composite cylinder scheme can avoid the problem of the coordination of several cylinders, it also requires less hydraulic flow and less power.(3) Different control modes are analyzed. Matlab/Simulink software is used to analyze advantages and disadvantages between PID control and fuzzy PID control. Simulation results indicate fuzzy PID control has higher control accuracy and stronger anti-interference ability.(4) The AMEsim-Simulink joint simulation of composite hydraulic cylinder heave compensation system is established. Under different working conditions, the compensation effects are analyzed, results indicate compensation effects can meet the design requirements.This study provides a new idea for the design of hydraulic cylinder-type active heave compensation system with high compensation accuracy and low energy consumption. The compensation effect can meet design requirements. This study can also provide technical support for the development of the prototype.