应用正交多项式拟合模型对测试系统进行静态标定

对于固体火箭发动机压力测试系统一般要求是线性的 ,即被测量和输出的幅值成比例关系 ,但由于测试系统各环节的准确度所至或者由于外界或内部随机因素的影响 ,造成测试系统的非线性误差。针对测试系统的静态标定问题 ,分析了目前采用的平移端点法、分段直线法、高次多项式等拟合模型在应用上的不足 ,探讨了正交多项式拟合模型在应用上的优点。该方法不需解方程组 ,计算速度快、准确度高、程序容易编制 ,便于在线实现。

Adopting Orthogonal Polynomial Fitting Model to Calibrate Test System

It is necessary that the tested quantity is linear with output in scope. But it is not ideal due to components and environment's effect, and produces the system's non-linear error. Proposes orthogonal polynomial fitting model. Analyzes the weakness of advection terminal vertex method, polygon method, high number of times multinomial, and presents the advantage of orthogonal polynomial fitting model in use: it needn't solve equations set, fast in calculation, high accuracy, easy in compile program and easy realization in live line.