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Lars Seimetz
e45468ddaf Update on Overleaf. 2024-07-30 11:54:32 +00:00
Lars Seimetz
931f802044 Update on Overleaf. 2024-07-30 10:44:52 +00:00
Lars Seimetz
da91f965e7 Update on Overleaf. 2024-07-30 10:44:44 +00:00
Lars Seimetz
1d381a1d39 Update on Overleaf. 2024-07-30 10:44:39 +00:00
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cau-ath-er_i1-0/report.tex
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@ -139,9 +139,9 @@ The mechanical, thermal, and electrical interfaces of \acs{AHEPaM} with the \acs
Structural and thermal modeling was performed to ensure that \acs{AHEPaM} would survive environmental testing as well as the launch and space environment.
Results from initial thermal modeling show that it is possible to approach the above mentioned design temperature in the hot case by using an external radiator with a footprint of ~0.03m$^2$. Consequently during cold phases, where the instrument is not illuminated by the sun, operational heat in the range of ~5W needs to be considered.
Results from initial thermal modeling show that it is possible to approach the above mentioned design temperature in the hot case by using an external radiator with a footprint of $\sim$0.03m$^2$. Consequently during cold phases, where the instrument is not illuminated by the sun, operational heat in the range of $\sim$5W needs to be considered. Refer to (\cite{ahepam-djf} for details.)
Mechanical ...
While the first structural \acs{FEA} results show design-compliance with the main dynamic requirements (e.g. 1st natural frequency above 140Hz), the structural response regarding mechanical vibration needs to be improved. There are a few locations of the instrument, e.g. instrument feet and BGO-bracket, where the allowed maximum material stress is exceeded. (\cite{ahepam-djf}) While increasing the sheet thicknesses at these locations would mitigate these issues, it might be beneficial to review the structural design again towards potential improvements. That being said it needs to be noted that the \acs{FEA}, as a first step, has been set up using a relatively coarse mesh and e.g. assuming a homogeneous plate thickness instead of using the dedicated detailed stiffening ribs. Taking these aspects into account, next steps regarding the development of a \acs{FM}-design should include a revised \acs{SMM} which includes the latest design changes\footnote{Einsetzen} and the relevant structural design aspects. Furthermore a vibration test could be conducted with the available \acs{DM}-parts, which would help learning about the actual response of the unit and help improving it.
Due to resource constraints the instrument cover was not part of the \acs{DM}. While a concept has been presented, adequate engineering resources should be budgeted to finalize the design of the cover.