英 文 摘 要
Modeling and Dynamic Simulation of Main Engine Cooling
Water System Abstract
The main engine cooling water system is an important auxiliary system to ensure the stable operation of main engine. Through the cooling water circulating, the heat that doesn’t translate to mechanical energy which distributed away from the running of main engine has been taken away, and it has avoided the metal brittle fatigue and the invalidation of lubricating oil that comes from the accumulation of large number of heat. Therefore, the performance of the main engine cooling water system directly affects the performance of the main engine. If we want to optimize and give full play to the main engine cooling water system performance, there is a need to understand its thermal and hydraulic dynamic process at work. MATLAB is a fashionable tool for computer modeling and simulation. The simulation for main engine cooling water system based on MATLAB embodies the characteristics of tracking, researching, and using new technology, thereby is worthwhile
This paper based on the main engine cooling water system of Dalian Maritime University training vessel, a thermal math model has been founded through the thermal analysis of the heat exchanger and main engine based on the theory of thermodynamics. And based on the theory of fluid mechanics, through analysis of pipeline, the main engine cooling water system hydraulic mathematical model has been founded. Then the author use Simulink for simulating, the result is coincident with known data, thus verifying the correctness of the model.
On the basis of the mathematical model is nearly accurately, the author get the simulation displaying through programming language Visual C#. Firstly, utilize the Objected-Oriented Technique to categorize the main engine system into many child objects to achieve certain functions, and compile every object to a class in the programming language Visual C#. These classes are not visual from the outside, and
英 文 摘 要
they exchange data and function only through the outer joints. Next, in the environment of Microsoft Visual C#.Net, with the help of many kinds of graph making tools, form a lot of simulation interfaces which can ensure some functions about simulation operating and displaying. Then connect the simulation interfaces effectively with those computing classes, finally complete the simulation software.
Key words: Main engine; Cooling water system; Modeling; Simulation
目 录
目 录
第1章 绪 论 .................................................................................................................. 1
1.1 选题背景与意义 ................................................................................................ 1 1.2 国内外研究动态 ................................................................................................ 3
1.2.1 建模与仿真的国内外动态 ...................................................................... 3 1.2.2 主机冷却水系统建模的国内外研究动态 .............................................. 5 1.2.3 国内外建模与仿真的现状分析 .............................................................. 7 1.3 本文的主要工作及论文结构 ............................................................................ 7 第2章 船舶主机冷却水系统概述 ................................................................................ 9
2.1 主机中央冷却水系统的概念 ............................................................................ 9 2.2 主机中央冷却水系统的组成 ............................................................................ 9
2.2.1 高温淡水回路 .......................................................................................... 9 2.2.2 低温淡水回路 ........................................................................................ 12 2.2.3 海水回路 ................................................................................................ 16
第3章 主机缸套冷却水系统的管路水力数学模型 .................................................. 17
3.1 计算原理 .......................................................................................................... 17 3.2 管网水力计算 .................................................................................................. 18
3.2.1 沿程损失的计算 .................................................................................... 18 3.2.2 局部损失的计算 .................................................................................... 19 3.2.3 串联管路等效阻力系数 ........................................................................ 21 3.2.4 并联管路等效阻力系数 ........................................................................ 22 3.3 泵的特性曲线 .................................................................................................. 23 3.4 编程计算 .......................................................................................................... 23 第4章 船舶主机冷却水系统的热力数学模型 .......................................................... 25
4.1 高温淡水回路热力数学模型 .......................................................................... 25
4.1.1 主机缸套冷却的热力数学模型 ............................................................ 26 4.1.2 造水机系统的换热数学模型 ................................................................ 28 4.1.3 高温淡水系统三通阀混流模型 ............................................................ 29 4.2 低温淡水回路热力数学模型 .......................................................................... 30
4.2.1 主机缸套水冷却器的热力数学模型 .................................................... 31 4.2.2 主机滑油冷却器的热力数学模型 ........................................................ 35 4.2.3 主机空气冷却器的热力数学模型 ........................................................ 36 4.2.4 低温淡水冷却器的热力数学模型 ........................................................ 37
目 录
4.2.5 其它换热设备的热力模型 .................................................................... 38 4.2.6 低温淡水系统三通阀混流模型 ............................................................ 39 4.2.7 低温淡水系统三通阀出口分流和低温淡水冷却器前混合模型 ........ 39 4.3 PID控制 ............................................................................................................ 41
4.3.1 PID控制原理 .......................................................................................... 41 4.3.2 高温淡水系统三通阀温度控制系统数学模型 .................................... 42
第5章 基于SIMULINK的主机冷却水系统仿真 ..................................................... 43
5.1 SIMULINK中仿真模型的建立 ....................................................................... 43
5.1.1 高温淡水系统仿真模块 ........................................................................ 43 5.1.2 低温淡水系统仿真模块 ........................................................................ 45 5.1.3 PID控制模型 .......................................................................................... 47 5.2 仿真曲线分析 .................................................................................................. 48 第6章 船舶主机冷却水系统仿真软件的实现 .......................................................... 51
6.1 仿真软件的开发原则 ...................................................................................... 51 6.2 仿真软件的开发环境 ...................................................................................... 51
6.2.1 选择开发平台 ........................................................................................ 52 6.2.2 选择开发语言 ........................................................................................ 52 6.3 仿真软件的设计思想 ...................................................................................... 53
6.3.1 面向对象的方法 .................................................................................... 53 6.3.2 统一建模语言 ........................................................................................ 55 6.4 仿真软件程序设计与实现 .............................................................................. 56
6.4.1 仿真算法程序设计 ................................................................................ 56 6.4.2 控件的设计 ............................................................................................ 57 6.4.3 界面的组织及其通讯 ............................................................................ 57
第7章 船舶主机冷却水系统仿真软件界面的设计 .................................................. 59
7.1 仿真界面设计原则 .......................................................................................... 59 7.2 主要仿真界面 .................................................................................................. 59
7.2.1 高温淡水系统界面 ................................................................................ 60 7.2.2 低温淡水系统界面 ................................................................................ 61 7.2.3 海水系统界面 ........................................................................................ 62 7.2.4 造水机系统界面 .................................................................................... 63
第8章 结论与展望 ...................................................................................................... 65
8.1 研究结论 .......................................................................................................... 65 8.2 工作展望 .......................................................................................................... 65
目 录
参考文献 ........................................................................................................................ 67 攻读硕士学位期间公开发表论文情况 ........................................................................ 71 致 谢 ............................................................................................................................ 72 研究生履历 .................................................................................................................... 73