A. Moghaddam; A. Alizadeh; Alinaghi Ziaei; A. Farid Hosseini; D. Fallah Heravi
Abstract
Genetic Algorithm as a one of the main evolutionary algorithms has had a most successful role in the water distribution network optimization.This algorithmhas been undergoing many reforms and improved versions are published. A type of genetic algorithms is Fast Messy Genetic Algorithm (FMGA), that has ...
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Genetic Algorithm as a one of the main evolutionary algorithms has had a most successful role in the water distribution network optimization.This algorithmhas been undergoing many reforms and improved versions are published. A type of genetic algorithms is Fast Messy Genetic Algorithm (FMGA), that has the ability to increase the convergence rate in solving optimization problems with reducing the length of chromosomes and removing the inefficient genes, meanwhile studying the chromosomes which are not equal in terms of gene strings.In this paper, for evaluation of the FMGA performance in solving water distribution network optimization problems, after the sensitivity analysis and determining the best values of these parameters, two benchmark networks and a real network are analyzed, which are named Two-loop network, the Hanoi network and Jangal City network, respectively, and the results were compared with previous researches. Least-cost in two loop network was estimated after 2880 number of function evaluations that had significant improvements compared to the results of previous researches. In Hanoi network, the minimum cost obtained equal to 6.045×106 $ that is less than other researchers results are issued so far. After proving the efficiency of algorithm, its performance was shown in design of real Jangal city network according to increasing network size and design constraints.
A.R. Gheisi; A.N. Ziaei; Saeed Reza Khodshenas
Abstract
Damage or failure is an inevitable event which should be considered in all decisions taken at planning-, design-, operation- and maintenance-level for a water distribution network (WDN). So far several studies are conducted about reliability analysis in literature, but very little attention is paid to ...
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Damage or failure is an inevitable event which should be considered in all decisions taken at planning-, design-, operation- and maintenance-level for a water distribution network (WDN). So far several studies are conducted about reliability analysis in literature, but very little attention is paid to the damage tolerance analysis (DTA) of WDNs with different orders of failures. This may be due to the heavy and extremely time consuming computational workloads commonly required for DTA. In this study required relationships for DTA of WDNs with different orders of failure are derived. Additionally some equations are proposed to estimate the possible errors in these relationships. Then an attempt was made to evaluate the damage tolerance of sixteen designs of a hypothetical WDN with different orders of failure. The results indicate that application of the proposed equations of this study could significantly prevent redundant and unnecessary hydraulic simulations which may complicate the DTA of WDNs. Moreover the results reveal that the tolerance of the WDN to various orders of failures gradually decreases by decreasing the diameters of pipes. Comparing the damage tolerance of a network with different orders of failure, one could estimate the sensitivity of a WDN to simultaneous failures.
