单模式LIPS 200离子推力器的寿命及可靠性定量评估

针对离子推力器产品工作寿命及可靠性定量评估的难题，结合单工作模式LIPS 200离子推力器产品成熟度提升需求，通过寿命主要影响因素耦合分析，应用试验数据、数值模型和数理统计方法，提出了单工作模式离子推力器寿命及可靠性定量评估的可行技术途径：通过分析模型、验证试验和数值模型之间的不断迭代实现各失效模式对应磨损模型的精细化；通过试验数据、精确化磨损模型抽样计算数据的样本检验获得准确的寿命概率威布尔分布参数；应用各失效模式对应寿命的三参数威布尔概率分布函数可进行具有工程应用任务针对性的离子推力器寿命及可靠性定量评估。

Quantitative Evaluation on Lifetime and Reliability of a Single mode Ion Thruster LIPS 200

To improve the readiness level of a single mode ion thruster LIPS 200, an approach to quantify the lifetime and reliability of ion thrusters is proposed. This approach involves coupling analysis of the factors of lifetime, numerical models verified by test data, and statistical methods. The wear models corresponding to the main failure modes of the thruster are refined through iteration of analysis, test, and numerical models. By applying test data and sample test to the refined wear model, accurate Weibull distribution parameters are obtained for the thruster lifetime. Thruster lifetime and reliability for certain missions can be quantified with 3 parameter Weibull model of lifetime for each failure mode.