A dynamic optimization method for preventive replacement timing of water supply pipe network

Abstract

The invention provides a dynamic optimization method for preventive replacement opportunities of a water supply pipe network. Firstly, water supply network failure rate analysis and hydraulics calculation are carried out, an economic target of water supply network maintenance and a reliability target of water supply network maintenance are set, and decision variable generalization and chromosome gene coding design of water supply network maintenance are carried out so as to reduce the number of decision variables; then, a non-dominated sorting genetic algorithm with an elitist strategy is adopted to optimize and solve the preventive maintenance and replacement opportunity of the pipeline; and finally, the optimal pipe network maintenance scheme is comprehensively weighed and identified. According to the method, the double-target characteristics of the water supply pipe network can be considered at the same time, dynamic optimization is carried out on the opportunity of preventive replacement of the water supply pipeline for the future planning period, important guiding value is achieved for water supply enterprises to make pipe network maintenance schemes and carry out pipe networkmaintenance planning, and the intelligent level of water supply pipe network construction and management decision making is improved.

Description

technical field [0001] The invention relates to the technical field of water supply pipe networks, and is a dynamic optimization technology for the timing of preventive replacement of water supply pipe networks facing the double goals of economy and reliability. This method can simultaneously take into account the dual-objective characteristics of the water supply network, face the future planning period, and dynamically optimize the timing of the preventive replacement of the water supply pipeline. Intelligent level of water supply network construction and management decision-making. Background technique [0002] As the lifeline of cities and towns, the water supply network is an important part of the urban water supply system, directly related to water supply safety and human health. With the evolution of time, the water supply pipe network has become aging and invalid, and the problems of pipe leakage and pipe burst are particularly prominent, which cannot meet the requi...

AI Technical Summary

Problems solved by technology

For a long time, water supply decision-makers have mainly used the following methods to determine the timing of preventive replacement: 1) using empirical methods, such as preventive replacement based on pipe age and pipe material indicators, 2) using a comprehensive scoring method to rank the water supply pipelines. Next, select and replace the pipelines. This method usually does not consider the impact of the pipeline replacement measures on the pipeline network system; 3) The minimum economic cost is used as the goal, and the single-objective optimization calculation is performed to determine the determination, usually without considering the hydraulic constraints

The main disadvantages of these methods are: 1) they cannot take into account both economical efficiency and reliability, and usually choose the least costly scheme, which leads to damage to the reliability of the water supply network system; Due to the aging and evolution characteristics of the network system, it is impossible to carry out dynamic economic analysis

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