固定式喷灌系统经济管径的计算方法
Calculation method of economical tube diameter of fixed spray irrigation systems
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摘要: 在分析了固定式喷灌系统的管网投资、年运行费用与管径函数关系的基础上,利用工程经济分析中费用最小化准则和非线性规划理论,建立了求解喷灌系统管网经济管径的数学模型,并给出了无约束条件直接求解经济管径的计算式.Abstract: Based on the analyses of the investment of nozzle tube net and relationship between the annual operation cost and tube diameter function of a fixed spray irrigation system, a mathematic model to calculate the economical tube diameter of a spray irrigation system is developed by using the minimum expense norm and nonlinear planning theory in engineering economic analysis, and a direct calculation formula for the economical tube diameter in unrestrained conditions is presented.