基于AQUIS的供水管网仿真及运营管理系统开发研究

以某市一独立试点区域的供水管网为研究对象,通过分析建模基础资料的需求及管网建模完整流程,论述了基础资料完整程度、基础模型创建及模型组态校核的重要性.从开发研究的目标、开发系统设计架构及关键技术问题等角度,分析了将水力仿真理论、计算机信息技术和企业管理方法等不同学科知识相结合,所建立的城市供水管网仿真与运营管理系统的优势...     

城市供水管网仿真模拟分析平台的开发与应用

针对人们对城市供水安全性要求日益提高、供水系统的规模不断扩大、复杂性随之提高等问题,对城市供水管网仿真建模与软件开发技术进行了系统研究．首先,对供水管网参数测试分析技术进行研究,较为准确地掌握了整个供水管网的用水量负荷、用户用水模式及变化规律、压力分布规律及主要供水管段的实际过流能力等状况,建立供水管网仿真模拟数据库．在此基础上,以供水管网科学合理运行、保障供水水质等为目标,结合供水管网在线监测技术,以某城市开放式区域供水管网为例,建立了该区域供水管网微观水力模型,并开发了城市供水管网仿真模拟分析平台．该平台具有良好的扩展性及实用性,目前正在某城市进行应用．     

SimHydraulics/Simscape在供热管网水力分析中的应用

供热管网水力计算手工分析过程非常繁琐.SimHydraulics/Simscape作为专业的水力仿真辅助分析软件工具包可通过模型化图形输入、输出方式构建应用系统模型进行分析计算,从而简化过程实现动态仿真.该工具集具有建模直观、编辑方便、计算分析快速准确、交互性能强大等优点.尤其适用于对现有管网进行校核计算和模拟调节以及水力器件的性能仿真.     

以管网模拟仿真的应用为例探索智慧燃气发展路径

各个城燃企业正在积极开展智慧燃气探索与建设,推动企业向数字化、智能化转型,从而持续提升企业服务能力、安全保障能力。本文描述了管网模拟仿真软件建模、赋值、分析过程,为确保管网模拟仿真应用的准确性与有效性,结合管网模拟仿真的应用过程对A燃气公司管网发展现状进行分析,找出与管网模拟仿真应用的数据要求的差距点,对A燃气公司“十四五”智慧燃气规划提出几点发展方向。     

基于阻抗辨识的复杂空间热网仿真研究

针对供热管网拓扑结构为空间网的特点,采用空间网水力工况计算方法代替传统的平面网计算方法,建立了复杂空间热网的仿真计算模型。应用遗传算法实现了管网阻抗的辨识,介绍了阻抗辨识模型和辨识步骤及遗传算法的实现。通过算例验证了该方法的有效性和实用性。     

供水管网水力建模与漏失控制

介绍了传统水力模型及压力驱动节点流量模型在水力建模中的应用,并通过对H市供水管网水力建模全过程的阐述,得出了水力模型在管网漏失控制中的应用,其主要体现在通过对城市日用水量的预测,并将未来的用水情况应用到水力模型中,及时调整供水管网的工况,可以达到优化工况的目的,从而有效控制漏失.     

基于拓扑复杂程度的实际供热管网建模方法研究与分析

提出了按照管网拓扑复杂程度建立水力工况仿真模型的思路,以及结合流量方向和最小闭合差判断环网水力交汇位置的方法。以某市区集中供热管网为研究对象,根据3种复杂程度建立管网水力工况仿真模型,并取3种工况验证分析。结果表明,该方法能准确判断环网水力交汇位置,每一级的模型仿真压力与实际值的最大相对误差的绝对值均低于10%,且管网拓扑结构复杂程度越高,模型模拟误差越小,建模成本越高。     

中小型供水企业管网建模初探

供水管网建模作为仿真供水管网实际运行状况最有效途径,日益受到供水企业的重视。但供水管网模型在各供水企业,特别是中小型供水企业的实际建设和应用过程中由于受到诸多因素的制约,其效果未必尽如人意。本文以上海市自来水闵行有限公司管网建模为例,探索一条适用于中小型供水企业的管网建模之路。     

基于管网仿真技术的城市燃气运营管理实践

阐述燃气管网仿真技术发展现状,分析离线管网仿真技术在管网功能优化、运营管理监管、应急管理调度的应用现状,探讨在线管网仿真平台的建设要点及基本功能拓展。     

英国排水管网建模技术实例分析

基于排水管网水力模型软件(InfoWorks CS),介绍了一个英国小城镇排水管网建模过程.在实例中详述了英国管网建模规范、数据管理、模型构建以及模型检验等方面内容,最后针对我国现阶段的排水管网建模提出了值得借鉴的地方.     

Applicability of computer simulation to solving of waste and wastewater management,and pollution prevention problems

Concepts and methodologies of model building, modelling and computer simulation are presented. First, analysis of model types, classification and modelling philosophy are outlined. Next, special emphasis is given to the conceptual and technical tools applied in computer simulation. Finally, some examples of computer simulation application to solving of environmental problems are discussed.     

数值模拟技术在多孔砖墙传热性能研究中应用

本文总结了多孔砖的数值设计优化步骤。通过例子介绍了多孔砖墙传热数值模拟过程,以及砖孔可视表面辐射的模拟和墙体表面温度、热流密度的计算方法,并给出了有关结果。     

Evolution and validation of a thermal probe model

This article describes the progress on the modelling of a thermal probe apparatus for in situ measurement of the thermal properties of construction materials, using the commercial heat transfer simulation program Voltra. The article describes the evolution from a model representing a theoretical line source to a model representing a two-dimensional elementary thermal probe. The new model uses a more dense spatial grid. The results of simulations modelling a solid stainless steel probe, and a stainless steel shell filled with glass inserted into stabilized water (agar), glycerine with fibre, toothpaste and polytetrafluoroethylene (PTFE) are described. These models are validated using data obtained through recent laboratory studies; continuity with the earlier work is demonstrated. Comparison of simulation results with experimental data confirms that percentage errors for conductivity and diffusivity are lowest for the model of the glass-filled probe.     

通风双层幕墙模拟方法研究进展及探讨

简要介绍了通风双层幕墙的通风方式,总结了通风双层幕墙三种常用的模拟方法(节点网络模拟法、计算流体力学模拟法和建筑能耗模拟法),分析了当前国内外研究方法及研究现状,探讨了它们各自的特点及应用场合,认为通风双层幕墙在建筑设计时,应进行具体的模拟分析,才能设计出性能优良的通风双层幕墙.     

基于三维地质模型的工程岩体结构精细数值建模

针对岩体结构数值模拟分析前处理工作中存在的地质模型建立、空间单元划分等难点,提出将三维地质模型与数值模拟分析进行耦合来简化其前处理的具体思路和方法。在三维地质建模系统中,建立精细的工程地质三维统一模型,通过单元网格几何模型的自动生成和模型数据的转换输入,可快速、准确地为岩体结构数值模拟分析提供不同类别、信息丰富的精细三维网格剖分模型,不仅简化了数值计算分析的前处理工作,同时也可丰富三维地质模型的属性信息,为工程设计与优化提供更直观、便捷的信息平台。     

高心墙堆石坝地震反应复合模型研究

高土石坝抗震分析得到国内外学者的极大关注。采用土工离心机振动台模型试验和动力数值模拟技术相结合的复合模型方法 来 研究高心墙堆石坝地震反应特性。 首先对不等比尺的离心模型试验结果进行数值模拟,以验证数值计算模型和确定计算参数,然后用数值方法对离心模型试验结果进行拓展和外延,推广到等比尺和原型情况。对比分析了 高心墙堆石坝地震加速度放大系数、地震残余变形、防渗墙动应力和破坏模式。计算值与试验值变化规律一致, 表明复合 模型是研究高心墙堆石坝地震反应特性一种行之有效的方法,（ 40 ～ 50 ） g 离心机振动台模型试验基本上可以反映高土石坝的地震反应特性。     

Modelica-based modelling and simulation to support research and development in building energy and control systems

Traditional building simulation programs possess attributes that make them difficult to use for the design and analysis of building energy and control systems and for the support of model-based research and development of systems that may not already be implemented in these programs. This article presents characteristic features of such applications, and it shows how equation-based object-oriented modelling can meet requirements that arise in such applications. Next, the implementation of an open-source component model library for building energy systems is presented. The library has been developed using the equation-based object-oriented Modelica modelling language. Technical challenges of modelling and simulating such systems are discussed. Research needs are presented to make this technology accessible to user groups that have more stringent requirements with respect to the numerical robustness of simulation than a research community may have. Two examples are presented in which models from the here described library were used. The first example describes the design of a controller for a nonlinear model of a heating coil using model reduction and frequency domain analysis. The second example describes the tuning of control parameters for a static pressure reset controller of a variable air volume flow system. The tuning has been done by solving a non-convex optimization problem that minimizes fan energy subject to state constraints.     

Building energy model reduction using model-cluster-reduce pipeline

This paper introduces a novel building energy model reduction pipeline called ‘model-cluster-reduce’. It is centred around using clustering techniques to identify archetypes and eliminate redundant zones. An experiment was conducted in this paper using a detailed EnergyPlus model generated from building information modelling directly. A total number of four reduced models were generated and compared against the original model, random select models and an expert model. The reduced models estimated annual energy simulation and parametric simulation results within 5% error margin, while reducing the overall simulation time by 95%. The proposed method – which is aimed at large models where inter-zone heat transfer is not significant – can be used to approximate parametric simulations or optimizations with greatly reduced runtime.     

A review of the application of SimuLink S-functions to multi domain modelling and building simulation

Multi domain modelling provides great opportunities for possible synergy between the building simulation domain and other scientific and technological domains. Although domains may have quite different models, they often use common mathematical representations, based on differential algebraic equations (DAEs) and/or ordinary differential equations (ODEs). This paper reviews the use of S-Functions in SimuLink for DAEs and ODEs modelling regarding building simulation and its potential for multi domain applications. It is concluded that ODEs are directly implementable using S-Functions in SimuLink. DAEs are indirectly implementable by a manual process of integrating Dymola/Modelica models. Examples from the literature confirm the great opportunities for the combined building thermal, geothermal, electrical and grid performance simulation.