【作者】 傅维秀；

【导师】 党志良；

【作者基本信息】 西安理工大学 ， 环境工程， 2006， 硕士

【摘要】 随着经济的发展、城市的扩大、用水量的增加、用水普及率的提高，各城市都面临着给水管网系统改扩建问题。由于给水管网投资大、管理费用高，合理的进行管网改扩建不仅能够丰富和完善管网设计内容，而且对于降低工程投资和提高新技术应用水平都具有重要的现实意义。管网改扩建优化设计须以管网运行工况分析为基础。本文从给水管网工况分析的理论知识和步骤出发，提出建立给水管网运行工况计算分析系统的概念，并对该系统各组成模块加以阐述，为实现管网改扩建优化设计奠定了基础。以山东省威海市某区给水管网改扩建工程为研究对象，运用灰色神经网络组合模型对城市中长期用水量进行了预测，达到了在数据较少情况下提高预测精度的目的，并运用MATLAB编程计算，经分析结果该方法是可行的。在分析给水管网阻力系数的现场测试方法和阻力系数对管网动态模型影响的基础上，提出运用灰色组合模型推求不同管龄、不同管径管道C值，完成了威海市给水管网C值的推求。在进行改扩建优化技术经济学研究的基础上，建立了城市给水管网改扩建优化设计模型，用Datafit软件和遗传算法的原理建立了一种新的管道造价公式来进行管网技术经济分析。针对改扩建优化设计问题为复杂非线性规划问题、决策变量为离散变量及目标函数为多峰值函数的特点，选定遗传算法进行求解分析。经过优化理论与技术经济学理论、计算机技术、给排水知识的有机结合，求解了威海市某区给水管网改扩建管段的管径，并将其应用于该市实际工程中，实践证明是可行的、可信的。更多还原

【Abstract】 With the development of economic, expanding of city, increasing of demand and the advancing of water extension, the huge investment and management cost. Optimal rehabilitation technology not only can enrich pipe network design content, but also enhance the application level of new technology , all of these have the important practical significance.Status analyze is the important foundation of the rehabilitation. The paper narrated the theories and steps of water network status analyze. This paper proposes compute and analysis system of water supply networks’ operating model and function of this system and all functional modules are expatiated. It settled base of optimal rehabilitation and expansion.Using the grey BP nervous network, this paper, beginning with the practical situation of rehabilitation and expansion in large-scale pipe networks of WeiHai, constructed the grey BP nervous network water consumption forecast model. This model can increase precision of grey model with a few data, which is proved by practice through MATLAB.On the basis of analyzing spot survey method of resistance-coefficient and its influence to water supply networks dynamic simulation, mathematics model of value C about different pipe-age and pipe-diameter is ascertained through grey linear programming. Value C ascertainment for an area of WeiHai water supply networks systems system is finished.This paper made analysis of techno-economy adopting a new formula of the pipeline’s cost by DATERFIT and genetic algorithm, according to water supply networks optimal characteristics. According to this, this paper established water distribution systems rehabilitation and expansion model, along with the studying of technique economy for optimal rehabilitation and expansion.Combining optimal theories, techno-economy theories and computer technique, this paper settled the diameters of pipe lines of rehabilitation and expansion for an areaof WeiHai water distribution systems. This result was proved to be feasible and applied, by way of the practice of real project.更多还原