Abstract
To assess stability of large-sized spatial beam-rod structures loaded with several force factors, the paper proposes to use the frequency-modal method based on solving the problem of natural oscillations in a preloaded structure. This approach makes it possible to obtain stability margin coefficients from action of each loading component for structures with geometric or physical nonlinearity. Using this method implemented in the Siemens Femap with NX Nastran finite element software package, the paper analyzes design of the mobile service tower of the Soyuz-ST launch vehicle (Kourou Space Center, French Guiana). Results show significant increase in the stability margin coefficient in bearing strength for the system as a whole, when using dynamic approach compared to the standard approach based on the Eulerian theory of adjacent equilibrium states. The results obtained demonstrate effectiveness of the proposed method.
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