论文部分内容阅读
不同形式喷灌系统的单位面积造价随着喷头间距S_L和支管间距S_m而变化的规律是不同的。因此,在采用电子计算机模拟特性曲面法选择喷头组合间距时就要找出其各自的变化规律,绘制各自的投资特性曲面。半固定式喷灌系统的特点是一套支管要先后在喷灌系统上多个位置重复使用。由于同时工作喷头数是S_L和S_m的函数,所以对于一定面积的喷灌系统,其重复使用位置的数目也是随着S_L和S_m而变的。考虑到这些因素,一个如图1所示的典型半固定式喷
Different forms of sprinkler irrigation system per unit area costs with the nozzle spacing S_L and branch spacing S_m changes in the law is different. Therefore, when using electronic computer simulation of characteristic surface method to select the nozzle assembly spacing, we must find out their own variation rules and draw their own investment characteristics surface. Semi-fixed sprinkler irrigation system is characterized by a set of branches to be sprinkler irrigation system in multiple locations repeatedly used. Since the number of nozzles working at the same time is a function of S_L and S_m, the number of reuse locations for a certain area of sprinkler system also varies with S_L and S_m. Taking these factors into account, a typical semi-stationary spray, as shown in Figure 1,