滴灌三角形迷宫滴头水力性能稳健性分析

由于滴灌滴头流道曲折复杂,各种结构参数都不同程度地影响着滴头水力性能,滴头水力性能分析时,很难建立显式的解析模型.为此提出基于移动最小二乘响应曲面法建立滴头水力性能可靠性指标对应结构影响参数的灵敏度分析模型.结果表明,滴头流道流量系数的可靠度对流道长度和流道宽度的均值灵敏性较强,对流道转角的均值灵敏性较差；滴头流道流态指数的可靠度对流道宽度和流道转角的均值灵敏性较强,对流道长度的均值灵敏性较差；基本变量标准差的增加会降低滴头流道流量系数和流态指数的可靠度.基于移动最小二乘响应曲面滴头水力性能可靠性灵敏度分析结果与通常的定性分析结果一致,验证了本方法的有效性.

Hydraulic Performance Robustness Analysis for Drip Irrigation Triangle Labyrinth Channel of Emitter

Considering the complicated relation of triangle labyrinth channel parameters to hydraulic performance, the explicit analytical model was not figured out. Moving least squares response surface methodology was introduced to build parameter sensitivity model corresponding to reliability of hydraulic performance. The analysis of parameter sensitivity shows that the length and the width of triangle labyrinth channel parameters have great influence on the reliability of flux coefficient. Meanwhile, the width, and the angle of triangle labyrinth channel parameters have great influence on the reliability of flow index. Standard deviation increasing in the parameters of triangle labyrinth channel will reduce the reliability of flux coefficient and flow index. The reliability sensitivity analysis for hydraulic performance demonstrates that the result of presented method is accord with the qualitative analysis. Thus the proposed method is efficient and accurate.