| The task of this paper is to do research on the simulation of liquid cargo carrier's cargo handling system modeled on 45000DWT oil product carrier, and develop the simulation software.The cargo handling system of liquid cargo carrier is a large and complex system, it includes a lot of sub-systems to ensure security during all phases of cargo handing operations, such as loading/unloading system, inert gas system, tank depth measurement system, high/high-level alarming system etc. Due to the complicated relationship of cargo handling systems, the control of cargo handling are mainly classified to two modes, one is to control on the spot, the other is in the console cabinet. The simulation of liquid cargo carrier's cargo handling system is attempt to do some research in cargo handling system's automatization and intelligence, it integrates loading/unloading system, inert gas system, valve, oil gas system and ship condition calculation by computer programming, accomplishes interlock and self lock in the system, avoids misoperation. The system condition parameters are automatically collected and analyzed to provide relevant instruction, and also the ship's floating condition and strength condition are calculated to inspect ship status at real time. It is obvious that the simulation of cargo handling system and software development are of great value. Here are some things done in the paper:1. The definitions and relationship of system, model and simulation are described, then system simulation is classified in different way, the significance and common process of system simulation are also given.2. Base on 45000DWT oil product carrier's cargo handling system, the principle of cargo handling system is studied and analyzed.3. The mathematic model of cargo handling system is created, including the models of cargo pump system, cargo tank, cargo valve, system information collection, system failure detecting, ship floating condition and ship strength condition etc. With the TCP/IP protocol the distributed network model of cargo handling system is developed.4. By the modern software design method, such as OOP,UML and so on, the model of cargo handling system is analyzed and the software model is built5. In the IDE of VB6.0, the software's graphic interface is designed, and also the kernel of software is developed. Many cargo handling plans in automatic mode and manual mode can be implemented, and the functions of system failure detecting, system interlock and self lock, misoperation avoidance, real time calculation of ship condition and so forth are accomplished. |
