机压喷灌干管管网优化的模糊线性规划法

在考虑了机压管道式喷灌系统配水干管管网流量变化的基础上,针对该管网控制点压力约束所具有的模糊性,建立了管网优化计算的模糊线性规划模型,在模型的求解过程中,通过适当的变换,将模糊线性规划问题转换成普通的线性规划问题。应用上述模型,可进行机压管道式喷灌系统配水干管管网的优化计算,可确定水泵最优扬程及干管各管段尺寸最优值,以使干管管网系统年费用值达最小。与普通线性规划模型相比,所提出的方法可使设计结果更加经济合理。

Fuzzy Linear Programming Model for Optimal Design of Main Pipeline Network in Pump Pressurized Sprinkler Irrigation System

Based on the change of flow rate within the main pipeline network of a sprinkler irrigation system with pump pressurized, a fuzzy linear programming (FLP) model was used for pipeline network optimization to deal with the fuzziness associated with the pressure constraints at control points. In the solving process, the fuzzy linear programming problem was transformed into a normal linear programming (LP) problem through certain procedures. With the model, the design of sprinkler pipeline network can be optimized, the optimal lift head and pipe size were determined, and the annual operational cost was minimized. Compared with the normal LP model, the method proposed in this paper can make the design more economical.