Computer Science
Scientific paper
Jan 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002iaf..confe.450b&link_type=abstract
IAF abstracts, 34th COSPAR Scientific Assembly, The Second World Space Congress, held 10-19 October, 2002 in Houston, TX, USA.,
Computer Science
Scientific paper
Within the context of Large Flexible Space Structures (LFSS), a Finite Elements Method has been applied to reproduce the effects of the accelerations induced by the ignition of a pyro-device on the structure of a satellite. Aim of this paper is to describe the starting hypotheses, the calculation procedure and the results of the structural mechanical shock analyses that have been performed on the numerical model of the RADARSAT2 ATD (Antenna Tie Down) assembly. The dynamic non- linear structural behaviour under the shock solicitation environment of the assembly has been investigated. The high- frequency structural analyses have been conducted basing on two domains: the time domain and the frequency domain, leading to the comprehension of the structure dynamic behaviour under the shock vibration environment. The analyses have been performed basing on a dedicated FEM model, where the number of degrees of freedom has been balanced between the computing effort and the requested accuracy on the results. As a first step, the model has been prepared and tested. Successively, the model has been correlated, in order to provide as an output the same main static and dynamic results as the 3D FEM model that has been used for the static analyses. After this process, the FEM model for shock analysis purpose (also indicated in the rest of the following document as "shock model") has been analysed with a specific non-linear transient-time solution, in order to obtain the time-history of the accelerations detected in several output points. The analysis has been conducted over the time interval included between 0 and 25 msec, and in the frequency band between 0 and approximately 10 kHz. As a conclusion, a transformation from the time domain to the frequency domain allows the presentation of the results in the acceleration-Vs.-frequency form, either with diagrams or in table exposition.
Barboni R.
Collini L.
de Benedetti M.
Galluccio G.
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