摘要
以Powell方向加速法作为优化手段,用两级优化法对滴头设计工作压力的取值问题进行了研究,利用Powell法进行二元函数最优化,得到非标准的毛管直径和滴头设计工作压力;选择具有标准管径的毛管,使标准管径不小于初步优化得到的管径、毛管耐压不小于初步计算的毛管实际最大水压力,以滴头设计工作压力为决策变量,用外部罚函数法将不等式约束变为无约束问题,利用Powell法进行一元函数最优化,得到可直接用于实际滴灌工程中的滴头设计工作压力值。
The dripper design operation pressure is determined by two grades optimal method and Powell optimal method. First of all, diameter of lateral and the dripper design operation pressure are viewed as deciding variable and diameter of lateral and the dripper design operation pressure are computed by Powell optimal method. Then, lateral with standard diameter which was not below to original optimal diameter and limited pressure is not below to original optimal maximum pressure is selected. The dripper design operation pressure, which could be applied to drip irrigation design, is determined.
出处
《排灌机械》
2005年第5期31-34,共4页
Drainage and Irrigation Machinery
基金
农业科技成果转化项目(04EFN217100395)
国家"十五"科技攻关项目(2001BA508B20)
关键词
滴灌
滴头设计工作压力
流量偏差率
Powell优化法
罚函数法
Drip irrigation
The dripper design operation pressure
The flow variation rate
Powell optimal method
Punitive function method
