根据正交函数拟合法对风机特性曲线进行研究，并得出了拟合曲线方程，从而用给出了风机的风压，功率和效率特性曲线，M语言进行编码所得结果与实测吻合较好-According to orthogonal function fitting on the fan characteristic curve studied and obtained fitting curve equation, which gives the fan with the air pressure, power and effici