Research On The Control Strategy Of Automatic Control System Of Ship Pneumatic Anti-heeling Device

Heeling can bring great harm to ship's operability, safety and economy. So it is necessary to install high-efficiency anti-heeling device for those special ships, such as the train ferry, heavy lift ship, large container ship and so on.The traditional anti-heeling device, such as the anti-heeling device activited by pump or valve-swithed, has slow response and compensation rate because the output of the pump is limited and also the pump needs a certain period to start or reverse. It is very difficult for the traditional anti-heeling device to meet the needs of those special ships. The pneumatic anti-heeling device has a fast response, high efficiency and reliability advantages, so it can compensate the heeling moment quickly enough to make the ship reach upright floating state rapidly.Currently, our country still has no the self-reliant ability to produce pneumatic anti-heeling device, and research in this area is still small, only about pneumatic anti-heeling device's basic components and working principle, but the control strategy of its core control system and implementation method is still poorly understood. Aiming at such a condition, this thesis has completed in-depth study on the control strategy of this device. The main work is as followed:Firstly, analyse the pneumatic anti-heeling device's basic structure and working principle and the heeling movement in statics and kinematics respectively, establish the mathematical model of the system of "ship-pneumatic anti-heeling device". Secondly, respectively apply the PID controller, fuzzy controller and fuzzy PID controller to the control system of pneumatic anti-heeling device, then simulate the PID control system, pure fuzzy control system and fuzzy PID control system with MATLAB software and analyse the control performance of this three control systems. The results indicate that the fuzzy PID contronller can meet the performance requirements of the automatic control system of pneumatic anti-heeling device. Finally, programme the fuzzy microcontronller and digital single chip with C language, realize the application of fuzzy PID control in the automatic control system of pneumatic anti-heeling device.