【作者】 郭伟；

【导师】 石振锋；

【作者基本信息】 哈尔滨工业大学 ， 计算数学， 2017， 硕士

【摘要】 给水管网微观模型的简化是主要通过水力模拟计算对选择的参数进行估算,删除或省略掉微观模型中对管网水力运行状态影响比较小的管段或节点,使得给水管网模型中节点和管段的数量大大减少,从而利用数据量较小的管网模型来表示数据量较大的大规模管网模型以达到管网模型简化的效果。本文主要以三维网格简化算法为基础对环状管网进行简化,将图形几何空间上的二次误差度量推广到管网微观模型中生成广义二次误差度量,从而为管网系统中的每条管段赋予一个权值,其中每一个权值表示的是在管网模型中简化此条管段所产生的误差,这样我们就可以根据权值的大小来选择需要简化的管段。同时本文提出的管网微观模型简化算法是在简化过程中对管段进行收缩处理,因此会产生新的等效管段。为了实现从微观模型到宏观模型的多粒度(多分辨率)管网模型,我们也对简化过程中的必要信息进行存储,使得简化后的管网微观模型能够实现逆向还原。由于初始给定的管网模型和简化之后的管网模型都不可避免地存在着误差,因此我们需要对管网模型进行校核。在本文中,我们将结合灵敏度分析法与DE算法来对管网模型进行校核。首先利用灵敏度分析法求解出管段的摩擦阻力系数对节点压力的灵敏度矩阵,最后结合灵敏度矩阵与管网校核模型,利用DE算法和水力计算模块对管段的海曾威廉粗糙系数(C值)进行校核。更多还原

【Abstract】 The simplification of the micro-model of the water supply network is to delete or omit the pipe or node which has little influence on the hydraulic running state in the pipe network and reduce the number of nodes and pipe sections in the water supply pipe network model by using hydraulic simulation to estimate the parameters,so that we can use small-scale pipe network model to represent a large-scale pipe network model to achieve the purpose of simplification.In this paper,we use simplification algorithm based on the three-dimensional grid simplification algorithm to simplify the ring pipe network,and we extend the quadratic error metric on the geometric space to the generalized quadratic error metric on the network model,which gives a weight for each pipe segment in the pipe network system.The weight for each pipe segment is considered as the errors generated by simplifying this pipe section in the pipe network model,so that we can select the pipe segments that need to be simplified according to the size of the weights.At the same time,the simplification algorithm of the micro-model of the water supply network in this paper is to simplify the pipe by the method of contraction,so that this will produce a new equivalent pipe section.In order to implement the multi-granularity(multi-resolution)pipe network model from the microscopic model to the macro model,we also store the necessary information in the simplified process,so that the simplified micro-model of the pipe network can achieve reverse reduction.As there are some errors in the initial pipe network model and simplified pipe network model,so we need to check it.In this paper,we will combine the sensitivity analysis and DE algorithm to check the pipe network model.Firstly,the sensitivity matrix of the frictional resistance coefficient of the pipe section to the node pressure is solved by the sensitivity analysis method.Finally,the H-W roughness coefficient(C value)of the pipe section is checked by using the DE algorithm and the hydraulic calculation module in conjunction with the sensitivity matrix and the pipe network model calibration.更多还原