Method for implementing DMA (direct memory access) partitioning of water supply pipe network in extremely small depressurization space

Abstract

The invention discloses a method for implementing DMA (direct memory access) partitioning of a water supply network in a minimum pressure reduction space, which comprises the following steps of: firstly, defining a similarity calculation formula between nodes, and then optimizing a coefficient in the similarity formula through a function gametiobj in MATLAB (matrix laboratory) so as to determine a partition boundary pipe section. Then, different minimum service water pressures are set and serve as constraint conditions respectively, the average water age of nodes after partitioning and the partitioning cost serve as targets, a function gametiobj is applied to obtain equipment arrangement schemes on multiple boundary pipe sections, and the optimal arrangement scheme is screened out from the equipment arrangement schemes through three principles. And finally, finding out an optimal pipe section replacement scheme by using a simulated annealing algorithm, so that the water pressure of the partitioned pipe network can meet the requirement of specified minimum service water pressure. According to the DMA partitioning method provided by the invention, the overall water quality of the partitioned pipe network cannot be greatly influenced on the basis of successfully completing partitioning, and a certain theoretical basis can be provided for quickening implementation of DMA partitioning, reducing the leakage rate of the pipe network and building an intelligent water supply system for water supply companies in various regions.

Description

technical field [0001] The application belongs to the technical field of urban water supply network design, and in particular relates to a method for DMA partitioning of a water supply network, especially a method for implementing DMA partitioning of a water supply network in a very small pressure-reducing space. Background technique [0002] DMA zoning is to close the valves and install flowmeters in the boundary pipe section to divide the entire pipe network into several relatively closed independent metering areas. Net leakage and control management system pressure purposes. Due to the closing of the boundary valves during partitioning, it will inevitably increase the head loss of the pipe network, thereby reducing the redundancy of the pressure of each node in the pipe network. It will make it difficult for the water pressure after they are partitioned to meet the minimum service water pressure, thus affecting the normal operation of the pipe network. [0003] At prese...

AI Technical Summary

Problems solved by technology

Zhou Lidian et al. used the node pressure fluctuation range within 10% as a constraint condition when optimizing equipment layout, which may make the node pressure at the end of the pipe network not meet the requirements

Zeng Han et al. restricted the water pressure of the nodes whose water pressure exceeded 16m before the division to not be lower than 16m after the division, and the nodes whose water pressure was lower than 16m before the division had the water pressure not lower than 0m after the division. The network creates a large space for pressure reduction, which may cause the water pressure of the node with low water pressure to be lower after partitioning

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