[HN Gopher] NASA solved a $100M vibration problem cheaply by str...
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NASA solved a $100M vibration problem cheaply by strobing the
display
Author : dharmaturtle
Score : 30 points
Date : 2021-08-08 19:35 UTC (3 hours ago)
(HTM) web link (gizmodo.com)
(TXT) w3m dump (gizmodo.com)
| e_y_ wrote:
| Designing and testing it would have cost them more than $5, but
| substantially less than $100M. Nice solution.
| andi999 wrote:
| What amplitude of oszillations are we talking here?
| dharmaturtle wrote:
| > vibration amplitude classified into low (< 0.3 g) or high
| (>0.5 g) (i.e., into 2 levels) were performed to assess the
| significance of these findings
|
| https://ntrs.nasa.gov/api/citations/20150000242/downloads/20...
|
| I was hoping to find something like "5cm", but it looks like
| "g" is all they offer.
| cratermoon wrote:
| http://www.spaceref.com/news/viewnews.html?id=1244
| 71a54xd wrote:
| This is such an awesome fix! I'm curious as to what portion of
| the aero / solid rocket motor causes these violent vibrations,
| specifically in the 10-12Hz range? Maybe I should've just
| finished my mechanical engineering degree instead of switching to
| EE / CS haha...
| cratermoon wrote:
| All of it. Solid rockets have what's called "resonant burning"
| https://blogs.nasa.gov/Constellation/2009/04/17/post_1239311...
| cratermoon wrote:
| Ares 1 was a terrible idea. Putting humans on top of solid rocket
| motors is bad enough when they are boosters alongside a more
| traditional liquid fueled stage that can smooth out the
| oscillations, but that still does nothing about the fact that you
| can shut down solids, and all abort scenarios involve just
| waiting until the SRBs burn out. Having humans riding a rocket
| that's just a giant firecracker is insanity.
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(page generated 2021-08-08 23:02 UTC)