Hybrid method for least-cost design of the water distribution systems | Hybridná metóda pre návrh distribučných systémov rozvodu vody
2009
Čistý, M., Slovenská technická univ., Bratislava (Slovak Republic) | Bajtek, Z., Slovenská technická univ., Bratislava (Slovak Republic)
A new optimization model for determining the minimum cost for the design of water distribution systems is described in the paper based on a combination of linear programming methodology (LP) and a genetic algorithms approach (GA). The optimal design of looped hydraulic pipe networks belongs to the class of large combinatorial optimization problems that are difficult to handle using conventional operational research techniques. A many different heuristic algorithms have been developed in the last two decades and applied to the design of water distribution systems. Although many research efforts have been made for the sake of achieving the optimal design of the looped water distribution networks, there is still some uncertainty about finding a generally reliable method. The authors of the paper are proposing a method in which the main emphasis is placed on its higher reliability of finding an optimal solution in terms of closeness to a global minimum. In this study the efficiency of GA optimization was improved through a hybrid method, which combines the GA method (heuristic component) with a linear programming methodology (deterministic component). The proposed method was tested on three benchmark least-cost design problems and compared with other methods and the results suggest that the GALP consistently provides better solutions. It was investigated that the method gives results more reliable in terms of closeness to a global minimum. The proposed method guarantees very close convergence to a global optimum. The method is intended for use in the design and rehabilitation of drinking water systems and pressurized irrigation systems as well.
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