航空发动机矢量推力测量系统的静态校准及不确定度评定方法研究

Static Calibration and Uncertainty Evaluation of Aero-Engine Thrust Vectoring Measurement System

介绍了航空发动机矢量推力测量系统的静态校准原理,建立了静态校准的数学模型,并通过多元回归分析方法得到了各阶模型的校准系数。在此基础上,针对目前矢量推力测量系统缺少精度评定规范的问题,提出了一种基于校准系数误差传递的不确定度评定方法,并与传统的校准残余误差方法和验证残余误差方法进行了比较。校准实验结果表明,由于加载条件不同引起的测量结果不确定度差异最大可达55%,所提方法可以得到随加载条件变化的不确定度区间,有效避免了传统方法因采用恒定精度值进行系统性能评价造成的局限性。

The static calibration principle of aero-engine thrust vectoring measurement system is introduced,the mathematical model of static calibration is established,and the calibration coefficients of each order model are obtained based on the multiple regression analysis method.On this basis,in order to solve the problem of the lack of universal quantized specifications for the accuracy of the thrust vectoring measurement system,an uncertainty evaluation method based on error propagation of the calibration coefficients is proposed,and compared with the traditional methods based on calibration or verification residuals.The results show that the level of uncertainty difference between different loading conditions can reach up to 55%.This method can obtain the uncertainty interval that varies with the loading conditions,and effectively avoids the limitations of the traditional methods due to their single-value uncertainties.