脉动压力相关时最大瞬时畸变值的预估

 给出了脉动压力相关时最大瞬时畸变值的估算式;与实验值比较表明,考虑脉动压力相关可明显提高最大瞬时畸变值的估算精度。考虑脉动压力相关后,不同条件下参数(K_(max)-K_(ss))估算的平均误差可由19.96％降至11.84％;参数(K-K_(ss))和σ_K估算的平均误差也分别由28.16％和11.37％降至12.33％和5.43％。此外还讨论了脉动压力相关程度对最大瞬时畸变预估值的影响。当平均相关系数(?)≤0.1时,不同条件下估算值相对误差均小于3％,这时可不考虑脉动压力相关。

ESTIMATION OF THE MAXIMUM INSTANTANEOUS DISTORTION WITH CORRELATED FLUCTUATION PRESSURES

The predicting formula of maximum instantaneous distortion are given in this paper. The comparison between estimated values and experimental results shows that the accuracy of estimation of the maximum value can be improved by considering the correlations between fluctuating pressures. The average relative error of the estimation for parameter (Kmax-Kss) can be reduced from 19.96% to 11.84%, and that for(K-Kss)and δK are respectively reduced from 28.16% to 12.33%, and from 11.37% to 5.43%, with consideration of the correlation between fluctuating pressures. The effects of the correlation coefficient between fluctuating pressures on the estimation of the maximum values are discussed in this paper. When the mean correlation coefficient, defined in this paper, is less than 0.1, at different condition the relative error of estimated values are less than 3%, the maximum value of instantaneous distortion can be estimated by an assumption of uncorrelated fluctuation pressures.