Month: August 2014

IPR coming up!

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The summer is soon over which will bring most of the SCRAP members back to KTH. The start of the semester in September is accompanied by a SED v3-0 deadline on the 7th followed by our Integration Progress Review (!!) on the 19th. 

Before the IPR, according to the SED guidelines, the experiments should have reached a certain status:

  • The experiment design should be completely frozen
  • The majority of the hardware should have been fabricated
  • Flight models of any PCB should have been produced or should be in production
  • The majority of the software should be functional
  • The majority of the verification and testing phase should have been completed

The experiment should be ready for service system simulator testing (requiring experiment hardware, electronics, software and ground segment to be at development level as minimum).

Content of IPR:

  • General assessment of experiment status
  • Photographic documentation of experiment integration status, with comments were necessary
  • Discussion of any open design decisions if applicable
  • Discussion of review items still to be closed
  • Discussion of potential or newly identified review item discrepancies
  • Discussion of components or material still to be ordered or received by the team
  • Clarification of any technical queries directed towards the visiting expert
  • Communication and functional testing (Service System Simulator testing for REXUS and E-link testing and BEXUS)

A lot of things have to get done before the IPR, thus the IPR and SED v3-0 is the main focus in the SCRAP team at the moment. In October its been a year since we started working on the experiment and to give an idea of how much is left before the REXUS Campaign (LAUNCH) in feb/march here are the remaining major milestones:

Sept 2014 – REXUS Integration Progress Reviews (IPRs) at student team sites
Nov/Dec 2014 – REXUS Experiment Acceptance Reviews (EARs) at student team sites
Dec 2014 – REXUS Integration Week, ZARM-FAB Bremen
Jan 2015 – REXUS Bench Test Week, DLR Oberpfaffenhofen
Feb/Mar 2015 – REXUS Campaign (12 days) , SSC, Esrange Space Center

Post launch:
Jun 2015 – Presentation of Experiment Results at the 22nd ESA Symposium
30 Jun 2015 – Delivery of the final REXUS Experiments reports to ESA


PCBs and stuff

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So what is the worst part of being the electrical engineer in a team?

Well, you can probably guess on a lot of things, but one thing that for sure makes them somewhat grumpy is realizing that the mechanical engineers didn’t really think as far as electronics. You see the mechanical engineers are always the first to complete the design, then the electrical engineers come in and get whatever space is left to squeeze in the electronics.

There still some space left in there. Just shove it in there between the optical sensor and the cartridges. It'll be fine.
There’s still some space left in there. Just shove it in there between the optical sensor and the cartridges. It’ll be fine.

But come on, I mean really, how hard can it be? Just stuff some of that electrical gizmo magic in there and make it move and stuff. (Yes, the author of this specific article just happens to be a mechanical engineer 😉 )

Just one of the electrical engineers working with whatever space was left over. I hope he's not too angry. He looks angry...
Just one of the electrical engineers working with whatever space was left over. I hope he’s not too angry. He looks angry…

Good thing we have a couple of brilliant electronics guys to save us. The SCRAP experiment is moving forward, and yes even the electronics.

/The SCRAP team

The lower part of the free falling unit

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After the critical design review, CDR, we can present the design of the free falling units, FFUs, that will fall from space during the experiment. Every unit will have 9 cartridge that contains around 110 g of copper particles. The black lid will be ejected at 5 km and a parachute will deploy.



Here the lower part of the FFU is shown that contains the explosives and the copper particles. Also the spectrograph and the battery can be seen in the picture.