基于MTBF的电推进羽流诊断系统可靠性预计与试验

Reliability Prediction and Test of Electric Propulsion Plume Diagnostic System Based on MTBF

  • 摘要: 电推进羽流诊断系统(Electric Propulsion Plume Diagnostic System,EPPDS)是由探针组件、移动平台和电控单元组成的用于空间电推进羽流特征参数诊断的自研设备,产品规定的可靠性指标要求平均故障间隔时间(Mean Time Between Failures,MTBF)检验上限θ0≥5 000 h。按照系统串并联模型及寿命指数分布模型的MTBF可靠性预计理论,给出了EPPDS的MTBF预计流程,进行了EPPDS 各模块MTBF预计,系统MTBF预计值为1.059×104 h。按照GJB 889短时高风险定时方案完成3台EPPDS 1 833 h的可靠性验证试验,试验结果表明电控单元输出的法拉第探针、朗缪尔探针和阻滞势分析仪的偏置电压和扫描电压参数均满足合格判据。该方法可用于电子机械产品的MTBF预计和验证。

     

    Abstract: Electric Propulsion Plume Diagnostic System (EPPDS)is a self-developing equipment used for the space electric propulsion plume diagnostic, which consists of the probe assembly, moving platform and control unit. The reliability index for EPPDS was required that the MTBF (θ0) must be greater than or equal to 5 000 h. According to the reliability prediction theory of MTBF with series-parallel system and the distribution of exponential life model, the prediction produce of MTBF for EPPDS was provided, and the prediction for modules was carried out, and the predicted MTBF of system was 1.059×104 h. According to the short-term and high-risk time terminated testing program in GJB 889, reliability verification testing enduring 1833 hours for three EPPDS indicated that all the output voltage parameters of power processing unit conform to the qualification criteria, including bias and sweep voltage for Fraday probe, Langmiur probe and retarding potential analyzer. The method can be applied to the prediction and validation of MTBF for other electro- mechanical products.

     

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