Water Distribution Network Optimization Design Based On Improved Multi Objective Honey Bee Mating Optimization Algorithm

With rapid development and urbanization going on,conditions of current water distribution network couldn’t suffice the demanding requirements in water consumption and water supply pressure.As we understand,there is usually contradictory relationship between reliability of the water distribution system and its cost.Considered these as constrains,multi-objective optimization design in water distribution system is of essence.A water distribution network hydraulic model was proposed in this paper.Current issues of existing water distribution system were specified.Part of this network was selected as the object for this research in order to improve the multi-objective optimization design.Nodes pressure membership value,nodes demand coefficient and redundancy in network loops were chosen as the indicators for the hydraulic reliability index for this model based on comprehensive research on influence factors and characterization method of hydraulic reliability,cost is also another important consideration in this multi-objective optimization model.Multi objective Honey Bee Mating Optimization(MOHBMO)algorithm was initially selected to solve this multi-objective optimization model.However,due to its limitation in local searching and solution distribution,BA-MOHBMO algorithm was developed to address these issues.By applying the bat algorithm to MOHBMO algorithm,the accuracy of local searching can be improved.By taking the Niche Strategy,the chance that the solutions to be uniformly distributed can be increased.Results from the Schaffer function,Rastrigin function and Griewank function indicate that BA-MOHBMO algorithm has a better performance in astringency comparing to traditional MOHBMO algorithm.Furthermore,steps were detailed in this article regarding how BA-MOHBMO algorithm solve the water distribution network multi-objective optimization model.Two-loops and Hanoi water distribution systems were introduced and utilized as multiobjective optimization model research objects.The simulation result from BAMOHBMO algorithm verified the feasibility and superiority in water distribution network multi-objective optimization problem.Finally,based on an actual urban water distribution network hydraulic model and multi-objective optimization model,some optimization model was built.The actual water distribution network optimization problem was solved with BA-MOHBMO algorithm.Results from BA-MOHBMO algorithm show that Pareto fronts were more equally distributed and the value of objective functions were more superior comparing to traditional MOHBMO algorithm.An alternative design scheme was proposed by optimization results.The unit head loss of pipes which were changed decreased by 81.32%,the node numbers in low pressure area declined 76.06%,average pressure of the water distribution network increased from 12.59 meter to 32.16 meter and pressure of the control node increased from 2.64 meter to 25.01 meter.Pressure of most nodes could be guaranteed and the overall pressure distribution is more uniform comparing to current water distribution network.This program could provide reference for the urban water distribution network optimization design problem.