Water Supply Network To Optimize The Design And Cad

With the development of the city modernization, municipal water supply system becomes more and more important in the municipal engineering. Because optimal technology of the water supply networks can not only save a great deal of funds but also improve the hydraulic condition of the whole network, it has better practical value. Although using optimal technology can make great economic effectiveness and social effectiveness, it lacks of practical function. Moreover, the computer that is a modern tool has not been widely used in the field. Using the literature materials and experience before, this paper makes a thorough study on optimal design of water supply networks. An algorithm of decomposing and coordination of system engineering which divides the optimization of the whole networks into three parts, i.e. optimization of water resource flow, and pipe-diameter and standardization of pipe-diameter is proposed. The three parts can be resolved by generalized contracted grads method, hybrid genetic algorithm which is the combination of genetic algorithm and GRG method separately. This paper also makes many reforms on genetic algorithm, which include using the technology of the real number code, broadening the selecting space, punishment tactics, arithmetical crossover, dynamic mutation and combining genetic algorithm with GRG method, so it brings faster searching velocity and better accuracy. Next through program Graphic databases and databases of water supply pipeline network are created by means of auto-searching the topological information of pipeline network, auto-numbering the pipelines and the joints, and measuring the length of pipelines and the flow distribution of initial pipelines from CAD. What's more, Through Visual C++, getting data from databases, optimal design and returning data back to databases are achieved. At last, the water supply networks CAD system and optimal method is tested and verified in an example.