Friday, May 16, 2014

Shock Recorder Report

EXES is back at Ames.  Here is a printout from the shock recorder detailing the environmental conditions on the trip back.  The time period is from 8:40 am May 15 to 1:20 am May 16.  The plot shows vertical gravity in green, Celsius temperature in red, pressure in tan, and humidity in blue.  Max vertical g-load was a single 2g spike above the normal gravity.  Interesting to see the pressure difference as the truck went up over the grapevine and came down to sea level.  Temp got as high as 33C.

Opened the crate and everything looks good.  I'll try to download the data from the trip down there for comparison.  It would be nice to know whether the air-ride truck we used for the trip back makes a big difference in g-loads.



Update:  I have downloaded the data from the other shock recorder.  It is made by a different manufacturer so the plots are formatted differently.  I'm including the most relevant (vertical) shock plot here.  Doesn't look much worse than the air-ride data to me, but comparing apples to apples is a little tricky perhaps.

I believe that the end of the trip down to Palmdale coincides with the beginning of the flat 1g section at about 08:34 on 3/3/14 (UTC).  The unloading of the truck is then the next bumpy section, and the -1g period is when we took the sensor off the instrument and (apparently) turned it upside down for awhile.  Nothing more than 2g for the trip down.

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