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Dynamic fault diagnosis must consider complex fault situations such as fault evolution, coupling, unreliable tests and so on. Previous dynamic fault diagnostic models and inference algorithms are mainly designed for the steady state systems, which are not suitable for the multimode systems. In this paper, a time varying dynamic model to solve the m...
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The satellite must continue working properly under different working environments and working loads. The power system is an essential component. Due to different working tasks, loads, and attitudes, a power system has many diverse working states. Therefore, it is necessary to accurately recognize the working state online for fault diagnostics and health management. However, under different working loads, measurement errors, environmental noise, environmental interference, and other uncertain factors, the output voltage value of a satellite power system has different levels of uncertainties. If these uncertainties and various working states are not considered, the recognition results can be of low quality. To address this problem and the uncertainty factors, we present an online dynamic working-state recognition system for satellite power systems based on uncertain data classification. In the system, we first explore the uncertain-data clustering center to model the working state. Then, with a slide-window processing strategy, we compute the distances between the uncertain cluster centers and the uncertain voltage data for the satellite power system online. Thus, we can obtain more accurate dynamic working-state recognition results. The evaluation results of real data demonstrate that the presented system is valid for working-state recognition and can be applied to a satellite power system.
