Aerospace Instrument-Making Annotation << Back Study of the Structural Survivability of On-Board Systems of Spacecraft Based on Centrality Metrics of Fuzzy Graphs of Digital Twins Pavlov A.N., Pavlov D.A., Vorotyagin V.N. Currently, digital twins are used to develop, test and launch spacecraft and entire space programs. However, the effective and high-quality functioning of on-board systems (BS) of spacecraft (SC) in the conditions of the occurrence of design and non-design emergency fl ight situations requires, when constructing their digital twins, new approaches to realistic control of technological processes for proactive assessment of the performance of the objects in question. An analysis of existing concepts and approaches to the multi-criteria selection of confi guration and reconfi guration of spacecraft BS in order to increase their reliability and survivability in the event of possible degradation of elements and subsystems and/or changes in the fl ight mission has shown that in the presence of non-design abnormal fl ight situations, as well as the design and creation of spacecraft, these approaches not acceptable. This requires further improvement of existing mathematical models, methods and algorithms for studying the structural dynamics of complex objects, which take into account the structural and functional features of complex complexes in dynamically changing conditions. The article proposes an original approach to the study of the structural and technological survivability of spacecraft BS, based on a fuzzy hypergraph formal representation of technological operations for controlling the orientation of the spacecraft. For a detailed study of the level of structural and technological survivability of the BS spacecraft confi guration, the differentiation operation of the specifi ed fuzzy hypergraph was applied, which made it possible, in order to assess the indicator of the survivability in question and the reasons for its change, to identify the most signifi cant functional elements (FE) of the BS spacecraft and evaluate their centrality metrics. Keywords: digital twin, on-board system, structural and technological survivability, derivative of fuzzy hypergraph. DOI: 10.25791/aviakosmos.8.2024.1424 Pp. 26-36.