通风机风压特性曲线多项式拟合的最佳次数

摘要

根据数值分析中最小二乘法的基本原理，按照解系数矩阵的方法，运用 origin7.5软件对 K40-6-№.15风机在叶片角为36°时的通风机风压特性曲线进行拟合，验证了最佳拟合次数，并确定了最佳拟合次数下的最优拟合方程，最后得出当拟合次数达到5次时拟合度最优，而并非拟合次数越高，拟合度也越高的结论。%According to the basic principle of least square method in numerical analysis,according to the solution of the coefficient ma-trix,it adopt origin7. 5 softwave K40 - 6 - №. 15 fan for fitting on wind pressure characteristic curve when the blade angle is 36 °fan,it verify the number of best fit,it determined the best fit under the number of optimal fitting equation,finally it is concluded that when the fit of the fitting number reaches 5 times the optimal,the number of fitting is higher,but the fitting degree isn′t higher.