A little confused why the AF calls it a "success story" before it's even tested in space...
Hi mtlapointe,Thanks for getting into the discussion here!I was interested in what kind of cell technologies you are using for the ROSA system, but couldn't find any information online. Are those regular single crystal multi junction devices or are you going for more flexible thin film technologies? Or is this simply a company secret
Hi mtlapointe, welcome to the forum!This is what makes NSF so great - where else on the internet can you get to chat to a Principal Investigatgor of a space experiment! I have a question for you - could ROSA technology be scaled up to enable it to potentially one day serve as a complete replacement for the current ISS arrays (i.e. same power generation capability, not necessarly same size)? Thanks.
Quote from: Lar on 06/11/2016 01:08 pmA little confused why the AF calls it a "success story" before it's even tested in space...Maybe they tested it on one of the classified X-47 flights?
Hi mtlapointe, welcome to the forum!This is what makes NSF so great - where else on the internet can you get to chat to a Principal Investigatgor of a space experiment!
... Our nominal schedule is removal from the trunk in about 2 weeks, with our demo mission beginning shortly after. We hope to have portions of the demo streaming live on NASA TV so stay tuned.
Quote from: mtlapointe on 06/04/2017 02:17 am... Our nominal schedule is removal from the trunk in about 2 weeks, with our demo mission beginning shortly after. We hope to have portions of the demo streaming live on NASA TV so stay tuned. Looking forward to to see this, now that MUSES and NICER are installed ...
Quote from: centaurinasa on 06/13/2017 09:41 amQuote from: mtlapointe on 06/04/2017 02:17 am... Our nominal schedule is removal from the trunk in about 2 weeks, with our demo mission beginning shortly after. We hope to have portions of the demo streaming live on NASA TV so stay tuned. Looking forward to to see this, now that MUSES and NICER are installed ...I thought we are waiting for installing NICER today evening.
How is the deployment speed controlled for ROSA?
Quote from: gongora on 06/13/2017 01:02 pmHow is the deployment speed controlled for ROSA?For deployment, it is reportedly purely controlled by insolation, which causes thermal heating and eventually, exceedance of the glass transition temperature over which the Elastic Memory Composite material releases its stored energy. So it should be a matter of precisely controlling solar insolation attitude over the array.For retraction, it is mechanically controlled by an incorporated motor, required for re-stowage after the demonstration is completed.Of course this is just from reading publicly-available sources, possibly Mtlapointe has better info
No, that design is not the same as ROSA. We use composite booms that self-deploy with their own strain energy. We don't use EMC materials.
Quote from: eeergo on 06/13/2017 01:26 pmQuote from: gongora on 06/13/2017 01:02 pmHow is the deployment speed controlled for ROSA?For deployment, it is reportedly purely controlled by insolation, which causes thermal heating and eventually, exceedance of the glass transition temperature over which the Elastic Memory Composite material releases its stored energy. So it should be a matter of precisely controlling solar insolation attitude over the array.For retraction, it is mechanically controlled by an incorporated motor, required for re-stowage after the demonstration is completed.Of course this is just from reading publicly-available sources, possibly Mtlapointe has better info mtlapointe already said this earlier:QuoteNo, that design is not the same as ROSA. We use composite booms that self-deploy with their own strain energy. We don't use EMC materials.
A third experiment will be extracted June 17 to test a new advanced solar array. The roll-out solar array, or ROSA, rolls out like a tape measure with solar cells on a flexible blanket. The ROSA, which could power future NASA spaceships and communication satellites, will be stowed back inside Dragon’s trunk after seven days of data collection while attached to the station’s robotic arm.
Quote from: gongora on 06/13/2017 01:31 pmQuote from: eeergo on 06/13/2017 01:26 pmQuote from: gongora on 06/13/2017 01:02 pmHow is the deployment speed controlled for ROSA?For deployment, it is reportedly purely controlled by insolation, which causes thermal heating and eventually, exceedance of the glass transition temperature over which the Elastic Memory Composite material releases its stored energy. So it should be a matter of precisely controlling solar insolation attitude over the array.For retraction, it is mechanically controlled by an incorporated motor, required for re-stowage after the demonstration is completed.Of course this is just from reading publicly-available sources, possibly Mtlapointe has better info mtlapointe already said this earlier:QuoteNo, that design is not the same as ROSA. We use composite booms that self-deploy with their own strain energy. We don't use EMC materials. You're right, I hadn't read it quite carefully enough. Although the question then is: what is the difference between the "Elastic Memory Composites" ROSA does not use, and the "strain energy composites" it does use?
This seems like a pretty early technology test, given the short stay on station. Assuming all goes well, what is the next step?