Testing & Manufacturing after the IPR

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Just to recall the events of the past weeks, last Friday we completed the Integration Progress Review (IPR). During the IPR we set a tight schedule for the upcoming two months during which we will complete the manufacturing of the experiment and the tests that are required to pass the next review, the Experiment Acceptance Review (EAR), scheduled for middle November.

In order to give you the idea of how the schedule looks like, we just let you take a look at it!!

Manufacturing_Testing_SCRAP_2 %281%29

Say good luck to us!!!!!!!!


IPR completed!

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This last Friday, The SCRAP Experiment successfully went through its Integration Progress Review (IPR)! The majority of the SCRAP team gathered in the Alfvén Laboratory at KTH to hold a short presentation and discuss our current status with Alex Kinnaird from SSC. The overall conclusion is that our progress is well on track in most aspects and we will be allowed to continue working.

Among the main points discussed were the contents of our documentation, the design changes made since the last review and our plan for work up until the launch in March next year. We also presented the hardware that has been manufactured so far and demonstrated its functionality.

The next documentation deadline for SCRAP is the 30th of October, which is closely followed by the Experiment Acceptance Review (EAR). At that point the vast majority of manufacturing, testing and analyzing for the experiment should (will) be complete!

We want you!

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Next Thursday (14/09/11), one week from now, the Rexus project will be presented in Room B2 at 11.00 am. In particular people from previous and actual teams (ISAAC and SCRAP), will show you the work done and the future developments. The new project will be revealed as well and we are looking forward to form a new team of motivated students! Join the meeting next Thursday and get involved in the new project, be one of us!

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.

Working hard

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Dear followers,

these are intense days for SCRAP team. The revision of the SED after the CDR has been finished last sunday, and now part of the team which is in Stockholm is keeping on manifacturing cartridges, while the rest, spread all over the world, is working at different tasks.

A nice picture of the new cartridges is shown below.


Some members are working on the electronic devices and schematics, while others are making some calculations in order to have an estimation of generated forces depending on quantity of gun cotton. 

The last, but not the least, the mechanical shape of the ejection control sensor is in a development process. As you can see, hard work is the keyword of these days! 

Keep calm and continue to follow us!