¶ Introduction
¶ Purpose and scope
This document is a compilation of all of the feedback given during the PDR (internal and main review) (Oral and written feedback). The goal of this document is to keep a trace of all of the feedback which was given, and to be used as a tool for transfering the feedback from the ST systems engineer to the ST team leader.
¶ Feedback processing states
No answers yet
Implementation in progress
Implemented
Denied
¶ Feedback
¶ General
- Review format: Do not ask super precise questions, it guides the attention away from potential late assemblies
- Review format: IPDR closer to PDR less change in between traning and real review
- Review format: Pour PDR il faut risk, TRL et Block diagram
To do for next review
- Technology states: Document for assemblies and for SS as a whole
Better assesment of technology readiness
- Technology states: If SS TRL trop bas, ça doit etre pret pour CDR
- Risk analysis: for SS
To do for next review
- Project management: Action list for missing points
To do for next review
- Next review: maybe new PDR?
To be discussed with SE
- Interface: Watch out for interface with PR
¶ Separation mechanism
- Pyrocutter: Opérations plus complex du point de vu EuRoC.
(To be discussed with SE)
¶ AV Bay
- Battery holder: on ressort, faire gaffe ça c’est déconnecter at launch. Cellule à la vertical, avec l’acceleration la battery s’est deconnecté.
Interface with AV to clarify orientation.
¶ Pressurant Bay
- CFRP rods: Did you look into torsion load? There should be simulation for torsional loads.
Torsion mode is a higher order eigenmode so, this load case was ignored as its occurence probability is negligible.
- Friction coefficient CFRP/Al: How to increase firction in between rods and ears ? Maybe have one ear which is not attached to the coupler, so that you do not need to deform ear but just apply load.
Tests will be carried out to measure properly the friction coefficient.
The solution proposed guarantees a better contact between the ears and the rods. However, with such design, the flight loads are likely too high for one load bearing ear. Moreover, the contact where assumed to be perfect in the design assumptions and the safety factors where implied to mitigate the real case uncertainty.
- Interface conique 45deg: moyen de controller la rectitude ? Operations pour vérifier coaxialité ?
(Already discussed with ATME but to be documented)
- Configuration: est ce que M ou L plus solide en traction ou compression ? ça pourrait aider pour prendre une direction pour comment agencer.
(Not understood)
¶ Tanks
- SS Limite elastique: on est sûr de la valeur, est ce qu’il y a des traitements dessus?
The stainless steel design was scrapped and replaced by aluminium
- Al: Risque de fisure pour le roulage ?
Provider guarantees that their aluminium can be rolled. Moreover, tests will be carried out before producing definitive tanks.
- Vortex/Slushing: Faire gaffe
FH9 flight time should not induce these phenomena.
For FH30, a semester project will be proposed to investigate these risks.
- Production method: Est ce qu’on est sûr d’avoir des sponos pour les soudures ?
Meili technologies
¶ Engine Bay
- Production: No disadvantages for standard thrust plate-> is there really a disadvantage?
Stay with conventional design
- Generative design: watch out for costs for backup parts
(To be evaluated)
- Generative design: watch out when integrating loads of functionalities that you do not lose basic functionalities such as ear stiffness.
(To be taken into account)
- Shape: How much does the shape change performances ?
To be evaluated by C-FD
- Shape: Try and choose shape for the PDR, design tradeoff will be impacted by timeline with reviews.
To be evaluated by C-FD
- Assembly & Integration: Watch out for alignment, given that it is longer.
Marks for alignement should be implemented
- Exhaust shield: is composite ok with the engine’s heat ?
Thermal analysis to be carried out
- State: ?
Method for mechanical design (fin alone) setted-up, waiting for final CFD data to finish the design. Attachment system to be improved.