| Citation: | Chen Shishun, Li Xiaoyang, Li Boyuan, et al. Reliability modeling and experimental verification method for ion thrusters considering sputtering erosion[J]. Journal of Aerospace Power, 2026, 41（X）：20250561 doi: 10.13224/j.cnki.jasp.20250561
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For the LIPS-300S ion thruster, which operates in multiple operating modes for deep space exploration missions, a belief reliability modeling, experiment design and verification framework was established. This framework encompassed reliability modeling, experimental design, and model updating and verification. A reliability model for the multi-mode ion thruster was constructed based on belief reliability theory considering sputtering erosion-induced electron backstreaming failure. An experimental design method was proposed with the aim of accurately verifying the degradation laws of the ion thruster. Subsequently, equivalence updating was applied to interdisciplinary equations based on the experimental controllable and measurable capabilities, mitigating model biases caused by unverified detailed physical derivations. Additionally, a linear correction factor was introduced to calibrate the degradation equations, addressing discrepancies between simulations and actual performance degradation. The effectiveness of the framework was validated using 12,000 h reliability experimental data from the LIPS-300S ion thruster. The results demonstrate that the updated and calibrated model can accurately characterize the performance and degradation patterns of the ion thruster across different operating modes, with 80% of the prediction errors within 5%. This work supports credible reliability evaluation for multi-mode ion thrusters, and effectively shortens the experimental time for reliability verification.
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