Modeling And Simulation Of Ship Cooling Water Pipe Network System

This paper, taking the cooling water pipe network system in the ship named "Yu Peng" as the study object, aims to calculate hydraulic model and design its simulation software based on hydrodynamics and graph theory. First of all, according to rigid theory of constant flow, analysis hydraulic state of cooling water, and mathematical modeling pipe and attachments in pipe network system. Secondly, use the theory of graph to build graphical models of steady cooling water pipe network system and obtain basic hydraulic equations in matrix form. Thirdly, study three different methods of solving pipe flow in the steady-state operating conditions. One of these methods, named solving ring energy method, contains Hardy-Cross method and graph theory algorithms. According to comparison of actual pipe network results in MATLAB programming calculations by several methods, proposed a graph theory method with adaptive correction coefficient, the calculation has a significant advantage in the actual simulation, owing to its less calculation and fast convergence rate. After the optimization of hydraulic calculation in the steady-state operating conditions, establish a mathematical model to calculate the unsteady hydraulic pipe network and propose methods to solving the hydraulic model, achieve unsteady-state simulation of the actual pipe network in variable pump speed and valve opening degree situations. Finally, based on the data of real ship, build the graph and mathematical model about high and low temperature fresh water system and sea water system. Design the cooling water pipe network system simulation interfaces and hydraulic calculation procedures with XAML and C# programming language; achieve the dynamic simulation of cooling water pipe network system in the Silverlight platform.