一种基于试验数据的发动机特性曲线拟合

准确的发动机特性曲线是其性能计算的基础。文章讨论了多种情况的特性曲线插值方法:在工作点位置区间内,对小数据情况引入了新的插值方法；多数据时,采用三次样条插值方法进行插值；在工作点位置区间外,数据较多时,基于最小二乘法进行不同工作点的拟合；当工作点位置数据较少,利用新的插值方法在区间内引入虚拟工作点增加数据点,后按照数据较多的情况处理。所得结果与实际数值比较,精度较高,具有一定的参考价值。

A Fitting on Engine Characteristic Map Based on Text Data

Correct engine characteristic map is basis of performance computation. Characteristic map of interpolation meth.od in many condition was discussed. For interpolation of internal work point zone,a new interpolation was introduced inthe less data; spline interpolation was adopted in the more data. For interpolation of exterior zone, different work pointswere fitted based on LS method, required map was gained according to fitting law. When work point data was less, a new in.terpolation method was adopted to adding data by introducing unreal work condition, and interpolation was dealt with ac.cording to more data. Results was precise compared to factual value, it had reference value.