航天器推进系统漏率测试不确定度评定  

Uncertainty Evaluation in Leak-Rate Testing of Spacecraft Propulsion System

作　　者：李宏宇 张静 彭光东 韩洋 张世一 陈丽 Li Hongyu;Zhang Jing;Peng Guangdong;Han Yang;Zhang Shiyi;Chen Li(Shanghai Institute of Spacecraft Equipment,Shanghai 200240,China)

机构地区：[1]上海卫星装备研究所,上海200240

出　　处：《真空科学与技术学报》2020年第7期625-629,共5页Chinese Journal of Vacuum Science and Technology

摘　　要：基于常压氦质谱累积检漏,提出了航天器推进系统漏率测试不确定度评定方法,建立了一元一次线性数学模型,运用最小二乘法理论对比分析了氦气累积过程和漏率标定过程的A类和B类不确定度计算结果,试验验证检漏不确定度评定的影响因素,认为氦气累积过程B类不确定度对航天器推进系统漏率测试结果的不确定度评定影响较大,而B类不确定度主要来源于检测仪器的固有测试误差,同时总结了检漏仪测试数据变化量与漏率测试不确定度的关系,为提高航天器推进系统漏率计算结果精准性指明了方向。We addressed the uncertainty-evaluation method,in leak-rate testing for spacecraft propulsion unit by accumulation leak detection technique with helium mass spectrometer in ambient environment.First,the conventional Type-A/B uncertainties were mathematically formulated with Linear-Equation in One-Variable model.Next,the influence of Type-A/B uncertainties on the measured leak-rate uncertainty,obtained in helium accumulation and in leak-rate calibration,was analyzed in Least-Square algorithm.The results show that when it comes to leak-rate uncertainty in helium accumulation,Type-B uncertainty has a much greater impact than Type-A uncertainty does.And finally,the dependence of measured leak-rate uncertainty on Type-B(inherent instrumental)errors was tentatively summarized.We suggest that the proposed uncertainty evaluation method be of some technological interest in leak-rate testing of spacecraft propulsion units.

关 键 词：氦质谱检漏 不确定度评定 漏率标定 航天器推进系统 

分 类 号：B774[哲学宗教—外国哲学] TH813[机械工程—仪器科学与技术]