If you use off-the-shelf electronics parts instead of expensive, hard-to-find space-rated gear, will your satellite work? The process of 'derating' will let you do this. Engineer Amanda Shields contributes today's guest column.
I'm becoming very familiar with derating and the joys of it. Electrical components for spacecraft have to be derated. Basically, that means that you take the electrical component and you look at the data sheet for that piece and you have to say "Well, according to the datasheet it can have a maximum input power of XX, but NASA says that it has to be derated to 80% of that, so we can actually only have an input power of YY".
You have to do this for DoD type equipment because it is more critical for the project to succeed that a $5 mass produced alarm clock (that the owner can just send back to the company for a replacement).
Traditionally they use this as the guideline for parts derating for spacecraft: http://snebulos.mit.edu/projects/reference/International-Space-Station/SSP30312RH.pdf
There are other options out there, Goddard has a set of requirements that they list here: https://nepp.nasa.gov/index.cfm/12821
There is also a list of Qualified Manufactures and Qualified Products (http://nepp.nasa.gov/npsl/npsl_toc.htm). If you use an item off this list, that means it's been approved for use and doesn't have to be derated. There aren't that many listed here and it's usually cheaper to buy commercial parts and just go through the derating process.
There was a lot of back and forth before I actually started working on this about what requirements we should use. While the second one is Goddard's and is newer, the ultimate decision to go with Goddard's was because it was less strict, and the project I'm working on is a payload and not a part of the actual spacecraft. If it had been part of the actual spacecraft, they would have been more likely to go with the first one.
(Amanda is working on the Capitol College 'VelcroSat' orbital debris removal testbed picosatellite project. The picture below has nothing to do with her work, but it a cool off-the-shelf kit that inspired the Project Calliope payload).
- PHYSICAL SCIENCES
- EARTH SCIENCES
- LIFE SCIENCES
- SOCIAL SCIENCES
Subscribe to the newsletter
Stay in touch with the scientific world!
Know Science And Want To Write?
- How A Former Naturopath Can Help Unravel The Trickery of Alternative Medicine
- Tidal Disruption Event: Black Hole Eats Star, Beams Signal To Earth
- Dear California: Why Is Farming Science A Bad Thing Again?
- Psychiatric Diagnoses Not Valid For African-Americans, Says Sociologist
- 5 Laws About Corpses That May Spook You
- 9,000 Years: Origin Of Farmed Rice Gets Pushed Back
- Dengue Virus Exposure May Amplify Zika Infection
- "This is an interesting set of lecture notes by Cranmer from TASI, https://sites.google.com/a/colorado..."
- "Criminal - Clinton Pathological Liar - Clinton Narcissist Egomaniac - Trump - Clinton Lied when..."
- "The only sensible numbers are zero, one, and infinity. Government works the same way. Zero - true..."
- "Hi John,I'll let your comment live out of respect for the effort you put in writing it, but I disagree..."
- "Spoken like someone who has never lived with a health issue that's seriously impacted their life..."
- ACSH Applauds Media Awareness of the Fentanyl Crisis
- Counting Bites Examined, to Help Decrease Food Intake
- The Safe And Unsafe Nutty Treats For Your Pup
- Mr. Potato Head Needs a New Warning Label!
- Shark Finning is Banned in the US; Banning Trade in Fins May Be Next
- Move Over Zika, It’s Yellow Fever’s Turn