改进的畸变极值预测法

一、参数估计中的二阶导数修正 1.极值预测基本方程 根据文献,在已知动态压力畸变指数D的概率分布P(y)时预测时间为T内的最大瞬时压力畸变由下式给出其中N=T/△T为预测时间的分段数,△T为单位时间段,m则为△T内对D的采样次数。 

AN IMPROVED METHOD FOR PREDICTION OF MAXIMUM TOTAL PRESSURE DISTORTION

Jacocks' method has been improved by deriving a difference correction matrix of second derivatives for Gauss-Newton iteration method. The numerical tests justify that the improved method enables the calculation to converge more rapidly and reduces the CPU time. The combination of the distortion prediction described in reference4] with Jacocks' method avoids the necessity of experimental extreme values as input data for the Jacocks' method. The comparison of the distortion prediction results with the experimental data demonstrates better agreement.