Model-based fault identification and modeling method for space propulsion System

To comprehensively identify the fault modes of complex Systems, a method based on model-based Systems engineering (MBSE) principles is proposed to synchronously identify potential faults from the three dimensions of functionality, Performance, and structure in the forward design and modeling process of complex Systems. Utilizing the extension mechanism of the System modeling language (SysML), the corresponding fault base models are developed for modeling fault modes and associated elements. Taking the propulsion System of the new generation manned spacecraft as an example, the process of fault identification and modeling is described in detail. The proposed method, rooted in the standardized, normalized, and multi-dimensional fault modeling process of MBSE, enables thorough identification and modeling of potential faults in complex Systems, avoiding the problem of previous methods that heavily relied on individual expertise and judgment, which provides a foundation for reliability and safety analysis in model-based complex System domains. © 2024 Chinese Institute of Electronics. All rights reserved.