National Aeronautics and Space Administration (NASA) Glenn Research Center

Microgravity Environmentat EXPRESS Rack 4 (ER4)

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Kevin McPhersonEric Kelly

Jennifer KellerKen Hrovat

Advanced Plant Habitat (APH)

National Aeronautics and Space Administration (NASA) Glenn Research Center

1.SAMS/MAMS Acceleration Data2.SAMS/MAMS Sensor Locations3.Microgravity Environment Components4.Three Aspects to Consider5.Vibratory Characterization of EXPRESS Rack 46.Quasi-Steady Characterization of EXPRESS Rack

47.Roadmaps for the Microgravity Environment8.Brief Characterization of Some Disturbances

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Outline

National Aeronautics and Space Administration (NASA) Glenn Research Center

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24x7 NASA SAMS & MAMSstream acceleration

data from the ISSto NASA GRC

NASA GRC Capabilities and Services

Web access to: near real-time displays, acceleration archives, and tailored off-line requestshttp://pims.grc.nasa.gov

pimsops@grc.nasa.gov

process & analyze

Start Date = 5/3/2001Stop Date = 10/1/2013

Stopwatch (hours) = 108,816NASA Sensor Hours ~ 405,976JAXA Sensor Hours ~ 4,298

Acc

el.

Arc

hive

>10TB

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SAMS/MAMS Sensor LocationsSAMSSE F02, MSG upper left seat trackSE F03, ER2 lower Z panelSE F04, ER1 lower Z panelSE F05, ER4 drawer 2SE F08, ER3 seat track TSH-ES05, CIRTSH-ES06, FIR-----------------------------------------------

MAMS in ER1 (OSS and HiRAP)

National Aeronautics and Space Administration (NASA) Glenn Research Center

Microgravity Environment Components

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MAMSGlobal (rigid body)

SAMSMore Localized with Increasing Frequency

a generic label NOT intended

to quantitatively characterize

platform

National Aeronautics and Space Administration (NASA) Glenn Research Center

1. Spatial• Where is your location of interest (module/rack)?• High-frequency vibrations tend to be localized, so request

SAMS sensor as close as possible to your location.• Low-frequency vibrations tend to be global. MAMS data can

be mathematically mapped to your location.• These slides focus on EXPRESS Rack 4 (ER4) in JEM.

2. Temporal• When do you expect to operate?• Relative quiet below ~6 Hz during crew sleep.• Some investigators leverage crew sleep for sensitive periods.• You “batten down the hatches” during reboost perhaps.

3. Spectral• Any resonances or sensitivities?• Fruit fly investigation has sensitivity between ~140-200 Hz.• Marangoni liquid bridge experiment sensitive ~0.25 Hz.

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Three Aspects to Consider

National Aeronautics and Space Administration (NASA) Glenn Research Center

Vibratory Characterization of EXPRESS Rack 4

Comparison of GMT 06-Jun-2013 to 07-Jun-2013 (f < 200 Hz):• Each plot on the left is spectral summary for that day.

• The black, dashed rectangle highlights portion of the acceleration spectrum from ~140-200 Hz. Spectrum for this sensor location is relatively stationary over the month analyzed for ER4.

• To see this in more detail, view the following link (a 30-page PDF) in flipbook fashion and focus on the frequency range from 140 Hz to 200 Hz:

http://pims.grc.nasa.gov/plots/user/etchells/2013_06_30_121f05_pcss_roadmaps500.pdf

• For lower frequency concerns, where the changes are much more subtle, see analogous summary at this link:

http://pims.grc.nasa.gov/plots/user/etchells/2013_06_30_121f05one_pcss_roadmaps142.pdf

Pow

er S

pect

ral D

ensi

ty

Frequency (Hz)7

See pages 16 & 20 at following link for follow-up on question about the units of Power Spectral Density (PSD):http://pims.grc.nasa.gov/MMAP/PIMS_ORIG/MEIT/MEIT_pdfs/meit2004/Section_13.pdf

National Aeronautics and Space Administration (NASA) Glenn Research Center

Quasi-Steady Characterization of EXPRESS Rack 4MAMS Quasi-Steady Measurements for June 2013:• X-, Y-, and Z-axis components of quasi-steady

(below 0.01 Hz) acceleration vector vs. time for the entire month (mapped to SAMS sensor location at ER4 in the JEM).

• The red, mean values show mean values derived from ISS rates/angles data for the month:

X = -0.023 ug, Y = 0.105 ug, Z = -0.350 ug• To see this in more detail, view the link below:http://pims.grc.nasa.gov/plots/user/etchells/2013_06_one_month_ossbtmf_radgse_map2er4.pdf

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National Aeronautics and Space Administration (NASA) Glenn Research Center

Consider the following timeline:

Web-Based “Roadmap” Resources

• ARCHIVE (lags real-time by 2 days): See roadmap spectrograms for SAMS ER4 Sensor (121f05) at:

http://pims.grc.nasa.gov/roadmap Navigate PIMS roadmaps with calendar view for last ~12 years!

• BUFFER (most recent 48 hours): Roadmap Spectrograms for SAMS ER 4 Sensor (121f05) at:

http://pims.grc.nasa.gov/plots/user/buffer Browse most recent 2 days of screenshots from real-time.

• REAL-TIME (most recent ~2 hours): Roadmap Spectrogram for SAMS ER4 Sensor is updated at:

http://pims.grc.nasa.gov/html/121_f05/PIMS_ISS_color.html This automatically refreshes in browser.

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National Aeronautics and Space Administration (NASA) Glenn Research Center

Brief Characterization of Some Disturbances

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Source Brief Characterization Notes

Progress Reboost* duration = 11.4 minutes, x-axis step = 0.4 mg* mean values based on 24 reboosts

ATV3 Reboost duration = 7.0 minutes, x-axis step = 0.3 mg

Mode One~0.1 Hz, fund. mode of main trussmonitored daily by loads and dynamics teamUSL < 2 ugRMS, COL & JEM < 3 ugRMS (Sept. 2012)

GLACIER Ops two narrowband spectral peaks:(1) 162 ugRMS @ 60 Hz, (2) 112 ugRMS @ 120 Hz

Ku-Band Antenna 5 to 17 Hz, nom. < 500 ugRMS with orbital period variations

MSG Ops broadband, step up 536 ugRMS for f < 200 Hz

Robonaut Ops narrowband peak: 50 ugRMS @ ~47 Hz

ARIS Attenuation 0.01 to 20 Hz, step down from ~100 to ~10 ugRMS (FIR ops)

CCAA fan: ~57 Hz or ~95 Hz, ~510 ugRMSwater separator: ~98 Hz, ~234 ugRMS

Crew Sleep/Wake difference primarily below about 6 Hz:USL during sleep ~11.8 ugRMS, during wake ~23.9 ugRMSJEM during sleep ~15.2 ugRMS, during wake ~34.6 ugRMSCOL during sleep ~17.3 ugRMS, during wake ~37.7 ugRMS

National Aeronautics and Space Administration (NASA) Glenn Research Center

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Source Brief Characterization and Notes

Soyuz 36S Docking transient/impulsive event, ~ 2 mgCygnus Capture

and Install quasi-steady shift on Z-axis of ~ 15 ng

MSG Work Volume, 3 Fans

73 Hz narrowband, open mode > 850 ugRMS47 Hz narrowband, normal mode < 10 ugRMS

Port Truss impulsive events, Sept. 4-27, 2013, nominally orbital period trigger external (truss) sensor at 5 mg threshold

Brief Characterization of Some Disturbances