10^(-6)量级精密离心机输出加速度测量模型及不确定度评定

Acceleration measurement model and uncertainty evaluation of 10^(-6) order precision centrifuge

为了给高精度惯性仪表校准试验提供高精准的加速度输入值,研究了精密离心机输出加速度的建模、测量及不确定度评定方法。建立了适用于10-6量级高精度精密离心机的加速度测量模型及不确定度传递模型。基于本课题组提出的高精度测量方法,完成了10-6量级精密离心机的静动态半径、静动态俯仰失准角等重要分量的高精度测量。分析、归纳了测量不确定度源,分别基于建立的加速度测量不确定度传递模型和蒙特卡洛方法完成了该精密离心机输出加速度的测量不确定度评定。最后,讨论和总结了高精度精密离心机输出加速度建模和精度评定的相关问题。结果表明:该精密离心机对1g^100g输出加速度的相对标准不确定度均小于3×10-6,其精度与目前国际上公开的最高精度离心机处于同一数量级;建立的测量模型及测量不确定度评定方法可以为相关精度等级的精密离心机研制和评价提供参考。

To obtain the high accuracy acceleration inputs for calibration of inertial instruments,the mathematical modeling,measurement and associated uncertainty evaluation of the acceleration produced by aprecision centrifuge were investigated.An acceleration measurement model and an associated uncertainty propagation model were established for the 10^-6 order high precision centrifuge.Then,major components,static and dynamic diameters and static and dynamic longitudinal misalignment angles,in the acceleration measurement model were measured precisely by using our proposed methods.Based on identification and quantization of measurement uncertainty sources,the uncertainty evaluation of acceleration measurement was implemented respectively by employing the uncertainty evaluation mathematical model of acceleration and Monte Carlo Method（MCM）.Finally,some issues were discussed and summarized on the mathematical model and uncertainty evaluation.Test results indicate that the acceleration relative standard uncertainty of the developed precise centrifuge is less than3×10^-6 under the spectrum of 1g-100 g.The precision of the developed precise centrifuge reaches the international advanced level and the proposed measuring model and associated uncertainty evaluation method can provide some references for other precise centrifuges.