Master Thesis - OUFTI-1

calculated, and their fulllment of all requirements imposed by ESA, was veried.
Chapter 3 developed the complete battery support design, from the initial idea to the
manufacturing of this support. The reasons that led to modify the last year's design, were
also presented. This design included:
• The selection of the several components which had to be incorporated inside the
support, including: batteries, thermal control's devices such as thermostats, heaters
and thermal insulator, was performed.
• Then, the material which was used to manufacture the support, was selected. This
material has to fulll several physical, mechanical and thermal requirements. This
step is really important because the thickness of the dierent parts that must prevent
the batteries' bulge, was determined in relation to the properties of the selected
material.
• Once the material and the components were selected, the design phase was presented.
The procedure was introduced step by step, just like it progressed during the whole
year.
• Finally, the design was validated by several calculations, such as the mass budget,
and FE analysis, including static and dynamic analysis.
Chapter 4 exposed a general procedure to create an accurate FE dynamic model of
electronic cards. Firstly, several existing methods were presented and their accuracy was
studied. Then, these methods were applied to the particular case of the homemade OBC
of OUFTI-1. A homemade method, based on the fact that several methods can be applied
to particular categories of components soldered on a same PCB, was also created. This
method is the one which presented the best results and so, it is the one that was applied to
each electronic card of OUFTI-1. Finally, some sensitivity analysis with regard to several
parameters which strongly inuence the PCB dynamic response, were carried out.
Finally, chapter 5 consisted in a complete FE analysis of the satellite. Firstly, the
modeling strategy used to represent each component of the satellite in the FE model, was
described accurately. Then, a static analysis was performed, and the results obtained ensure
that OUFTI-1 withstands well the quasi-static loads which will be applied to it during
the launch phase. The modal analysis led also to results that fulll all ESA requirements.
Finally, the procedure to realize a random vibration analysis was presented and all necessary
les were created.
Throughout this thesis, we have tried to develop a detailed and rigorous description of
the approach followed during all our progression. To realize this, a theoretical basis was
121