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Static and dynamic load superposition in spacecraft structural analysis

  • Received : 2016.12.16
  • Accepted : 2017.11.06
  • Published : 2018.03.25

Abstract

In mechanical analysis of spacecraft structures situations appear where static and dynamic loads must be considered simultaneously. This could be necessary either by load definition or preloaded structures. The superposition of these environments has an impact on the load and stress distribution of the analysed structures. However, this superposition cannot be done by adding both load contributions directly. As an example, to compute equivalent Von Mises stresses, the phase information must be taken into account in the stress tensor superposition. Finite Element based frequency response solvers do not allow the calculation of superposed static and dynamic responses. A manual combination of loads in a post-processing task is required. In this paper, procedures for static and harmonic loads superposition are presented and supported by analytical and finite element-based examples. The aim of the paper is to provide evidence of the risks of using different superposition techniques. Real application examples such as preloaded mechanism structures and propulsion system tubing assemblies are provided. This study has been performed by the Structural Engineering department of Airbus Defence and Space GmbH Friedrichshafen.

Keywords

References

  1. Charron, F., Donato, L. and Fontaine, M. (1993), "Exact calculation of minimum margin of safety for frequency response analysis stress results using yielding or failure theories", Proceedings of the 1993 MSC World Users' Conference
  2. ECSS (2013), ECSS Space Engineering-Spacecraft Mechanical Loads Analysis Handbook, ECSS-E-HB-32-26A, 19th February 2013.

Cited by

  1. An investigation on the vibrations of laminated shells under aeroacoustic loads using a WFE approach vol.6, pp.6, 2018, https://doi.org/10.12989/aas.2019.6.6.463