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i'm here with ken rovat and he is a

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microgravity data analyst and we're

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talking about one of the longest running

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payloads on the space station sam's what

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is sam's sams that's an acronym it

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stands for the space acceleration

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measurement system so we're measuring

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the vibrations

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very minute very tiny vibrations so i

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guess we don't think about the space

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station vibrating but what kinds of

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things make it vibrate and why do you

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have to measure this okay so on the very

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low frequency and below about five hertz

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or so we're actually monitoring the um

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structural vibrations of the space

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station there's very large structures a

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truss sort of the skeleton the backbone

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of the space station and that thing is

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actually oscillating at about 0.1 hertz

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all the time continuously and when the

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crew moves around they have to push off

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or land on structure they actually

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excite those structures and so those

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vibrations are important to the

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longevity of the space station a

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structure that's constantly bending and

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flexing it only has so many of those

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load cycles before it you have to say

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no more so that's on the low frequency

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end on the high frequency end we're

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looking at

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very tiny vibrations from

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experiment equipment like fans

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compressors

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wrote any sort of rotating machinery

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will vibrate and also life

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life support equipment

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also vibrates so it's not really of any

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interest really to the crew about

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vibrating but it is very

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interesting to i guess the principal

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investigators and their payloads yes so

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our two primary customers are

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principal investigators trying to

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conduct science and they're in the

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microgravity environment for a reason

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they want to take advantage of

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a pure a pristine environment so we

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we're sort of the environmental

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monitoring for microgravity we'll mount

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a sensor right near their payload and as

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they conduct their science they will

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often

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try to correlate or sometimes correlate

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what's happening but in a vibrational

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sense it's what it is they're actually

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studying so we can provide them that

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feedback and they can use that to

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make more sense of what they're seeing

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in their data

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and then another big customer of ours is

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at the johnson space center there's a

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loads and dynamics group

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they're in charge of validating a model

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of the space station so if you imagine

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on earth

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bridges and so forth you can have

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engineers go out and sort of take a look

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at that bridge for structural health and

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life

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whereas sam's provides 24 7 coverage of

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space station vibrations

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so we help with that model validation

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and that ultimately plays a role in

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extending the life of space station or

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giving feedback to the program about

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where we're at in terms of these loads

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and dynamics and how far out in the

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future we can go

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and we're here in the telescience

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support center here at glenn research

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center this is i guess

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data ground zero where it all comes to

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yes that's true for sams and mams and

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various payloads for space station

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and so the the consoles that you see

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here are where we receive this

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sams data from space station can we see

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some of that data up close sure

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so ken is there a whole lot of shaking

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going on when they're exercising abs

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absolutely lori so in this particular

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case we're looking at uh velo exercise

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and if you look at this somewhat

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schematic down here in the lower right

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um the sam sensor that we're going to

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talk about here in a second is located

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in the u.s lab and about 100 feet away

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in the russian service module

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is where the actual exercise is

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happening so you can see that events in

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one part of the station have an impact

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on another part but you have sensors

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strategically placed throughout where

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are they yes uh we have um eight sensors

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on space station right now for sams um

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they're they're located in all three

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labs in the u.s lab in the japanese lab

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and in the european lab

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these sensors are designed for

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to pick up very minute vibrations

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over a wide frequency range so

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they they really do a great job of

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monitoring the microgravity environment

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and giving feedback to investigators who

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need to know this information can you

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show us one of the sensors sure yep

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right here we have one of the sam

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sensors this is just the mass model that

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we keep on the ground uh but it's

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representative of what we'd see on orbit

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and so you see that the sensor has these

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what look like knobs on the three ends

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that's because it's a tri-axial sensor

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head so it's measuring accelerations in

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this direction what we call the x-axis

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in this direction for this sensor what

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we call the y-axis and in this direction

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for what we call the z-axis so all at

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the same time we're getting three sets

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of measurements uh x y and z

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and these measurements will continue as

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long as the station's there right yes

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and not only will it continue as long as

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the space station's there but they are

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helping to