ANT COLONY OPTIMIZATION OF TANK MAXIMUM LEVEL CONSIDERING HYDRAULIC AND QUALITY RELIABILITY

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FOTUHI M.; TABESH M.

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Journal: Modares Civil Engineering journal Year:2016 | Volume:16 | Issue:1 Page(s): 81-91

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Title

ANT COLONY OPTIMIZATION OF TANK MAXIMUM LEVEL CONSIDERING HYDRAULIC AND QUALITY RELIABILITY

Author(s)

FOTUHI M. | TABESH M. | Issue Writer Certificate

Keywords

MULTI-OBJECTIVE OPTIMIZATIONQ1

ANT COLONY ALGORITHMQ1

TANKQ2

RELIABILITYQ2

WATER AGEQ2

Abstract

Tanks in water distribution networks are used to store water for emergency conditions, fire flow demand and demand oscillations control. Construction of TANKs spends a lot of money and therefore using whole volume of TANKs is essential while operation. Otherwise, if TANK volume will be more or less than what is required during operation, TANK RELIABILITY is reduced. Accordingly, in this paper, a new relationship for TANK RELIABILITY according to water level variation in TANKs is defined. Therefore, maximum water level in TANKs is defined as the decision variable. The definition of TANK RELIABILITY is as follows. At first, the values of maximum level for each TANK is computed such a way that optimal use is provided from balancing volume of TANKs. In fact, for these maximum level values, maximum RELIABILITY is achieved for each TANK. Now if during optimization process, a value lower than these computed maximum level is selected for decision variables, TANK RELIABILITY is reduced. To compute the value of TANK RELIABILITY, the values of TANK water level for the selected decision variables is divided by the values of TANK water level for maximum TANK RELIABILITY. Also, because water level variation can effect on pressure and WATER AGE in demand nodes, this effect is investigated by considering hydraulic and quality RELIABILITY. In fact, variation of water level in TANKs changes node demand pressures and in result actual node demands. Also, variation of water level or on the other hand variation of storage volume affects on WATER AGE in demand nodes. Besides, in order to investigate the simultaneous effect of water level variation on hydraulic and quality RELIABILITY, a relationship is also defined for integrated RELIABILITY. Definition of integrated RELIABILITY is to investigate whether there is optimum maximum TANK level values that both hydraulic and quality RELIABILITY is improved simultaneously while TANK construction costs is minimum. Optimal management of TANKs in water distribution networks to provide required water of consumers with desired quality is of high importance. To achieve this, optimization is defined as a powerful tool. In this paper, by focusing on operation phase, MULTI-OBJECTIVE OPTIMIZATION of water distribution performance is performed in which TANK costs is considered as the first objective and TANK RELIABILITY, node hydraulic RELIABILITY, node WATER AGE RELIABILITY and integrated RELIABILITY is considered as the second objective. ANT COLONY ALGORITHM is codified in Microsoft Visual C++ for optimization due to its simplicity and high performance. The validity of the edited algorithm is tested on mathematical functions and proved to be applicable on water distribution networks. The created trade-off curve from MULTI-OBJECTIVE OPTIMIZATION helps the decision makers to select the top choice based on the importance of their own criterion whether it is hydraulic or quality. It should be mentioned that the created trade off curves have been produced under constant hydraulic conditions (i.e. pumps are On for 24 hours and nodal demands are constant). Further study should also consider pump rotation speed as the decision variable to achieve more accurate results. In fact these conditions help operators to make better decisions.

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APA: Copy

FOTUHI, M., & TABESH, M.. (2016). ANT COLONY OPTIMIZATION OF TANK MAXIMUM LEVEL CONSIDERING HYDRAULIC AND QUALITY RELIABILITY. MODARES CIVIL ENGINEERING JOURNAL, 16(1), 81-91. SID. https://sid.ir/paper/256740/en

Vancouver: Copy

FOTUHI M., TABESH M.. ANT COLONY OPTIMIZATION OF TANK MAXIMUM LEVEL CONSIDERING HYDRAULIC AND QUALITY RELIABILITY. MODARES CIVIL ENGINEERING JOURNAL[Internet]. 2016;16(1):81-91. Available from: https://sid.ir/paper/256740/en

IEEE: Copy

M. FOTUHI, and M. TABESH, “ANT COLONY OPTIMIZATION OF TANK MAXIMUM LEVEL CONSIDERING HYDRAULIC AND QUALITY RELIABILITY,” MODARES CIVIL ENGINEERING JOURNAL, vol. 16, no. 1, pp. 81–91, 2016, [Online]. Available: https://sid.ir/paper/256740/en

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