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Wednesday, July 10 • 11:50 - 12:10
A NOVEL APPROACH FOR THE CHARACTERISATION OF STRUCTURAL UNCERTAINTIES IN SATELLITES: FROM THE VIBRATION SOURCE TO THE FINAL RESPONSE

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The issue of dynamics variability in nominally identical complex structures is a topic widely accepted among the scientific community. Indeed, it has been proven that these structures, despite being supposedly identical, show a significant scatter in their dynamic response. This is due a range of issues such as manufacturing imperfections and tolerances. In this paper the effects of uncertainties on the dynamic response are addressed: first, construction defects affecting vibration sources, such as reaction wheels, are discussed. These devices have shown to generate different levels of vibrations, despite being nominally identical and belonging to the same production batch. Such scatter is mainly due to manufacturing irregularities in the inner moving parts as ball bearings, internal and external races. Hence, this paper presents a procedure to fully characterise these components by taking into account the defects affecting reaction wheel signature. Secondly, the variability of the structure on which the source is applied to will be investigated, in the case under analysis, a satellite platform. Indeed, by looking purely at the dynamic response of a constellation of nominally identical satellites, significant differences can be highlighted. Thus, this paper tackles this issue by showing such variability in a real case application and providing a methodology for the evaluation of uncertainties in terms of modal parameters, in particular modal mass and eigenvalues. In addition, a preliminary methodology is proposed to pinpoint the most critical components of the satellites in terms of uncertain properties. The output of this study could then be used in conjunction with a stochastic finite element method, such as the Craig Bampton Stochastic Method, to provide more accurate estimation of dynamic response of satellites.

Moderators
avatar for Simon Jones

Simon Jones

Associate Professor, Rose-Hulman Institute of Technology
Professional interests include undergraduate engineering education, finite element modeling, ground-borne vibrations, vibrations of musical instruments, and dynamics of toys.
GM

Guilhem Michon

Professor, ISAE-SUPAERO

Authors

Wednesday July 10, 2019 11:50 - 12:10 EDT
St-Laurent 7
  T07 Struct. dyn. & nonlin. vib., RS03 Struct ac & vibr