泵汽蚀曲线的分段多项式拟合

由于泵汽蚀曲线的特殊性,曲线形状直接影响NPSH3的取值。取值不同,影响对泵性能的判断。汽蚀曲线绘制方法有传统的手工绘法、多项式拟合法、非线性拟合法、三次样条插值法等。在此基础上,探讨了水泵汽蚀曲线拟合的方法,为了提高拟合曲线的精度,提出了一种泵汽蚀曲线分段多项式拟合的方法。并将该方法与非线性拟合和全部数据多项式拟合进行了比较,用该方法拟合的曲线不但光滑而且求出的NPSH3值较小。该方法较适合于泵汽蚀性能曲线的拟合。

Pump cavitation curve partition multinomial fitting

Pump cavitation due to the particularity of curve,the curve shape of a direct is impacted on NPSH3 values.Value is different affect pump performance judgments.Cavitation curve havs been drawing method of the traditional hand-drawn method,polynomial fitting,non-linear fitting,cubic spline interpolation method.On this basis, the pump cavitation curve fitting method is discussed,in order to improve the accuracy of curve fitting,pump cavitation presents a piecewise polynomial curve fitting method.And that the m...