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SAMS Request Background Information. Advanced Plant Habitat (APH). Kevin McPherson Eric Kelly Jennifer Keller Ken Hrovat. Outline. Capabilities and Services Sensor Locations Microgravity Environment Components Three Aspects to Consider Scheduling and Hardware Availability

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sams request background information
SAMS RequestBackground Information

Advanced Plant Habitat (APH)

Kevin McPherson

Eric Kelly

Jennifer Keller

Ken Hrovat



Capabilities and Services

Sensor Locations

Microgravity Environment Components

Three Aspects to Consider

Scheduling and Hardware Availability

Data Analysis

Some Photos

capabilities and services
Capabilities and Services
  • NASA GRC - continued goal of providing timely and readily accessible acceleration data, along with archival and analysis services for scientific payloads, structural dynamics monitoring, and technology developers.
  • SAMS - the Space Acceleration Measurement System:
    • has ability to instrument and measure local vibratory regime in all 3 of the ISS labs, including throughout the USL ( 0.01  f  300 Hz ).
    • given approval for upgrading the control unit, which provides a more robust, long-term solution for continued life-cycle support of the ISS.
  • MAMS - the Microgravity Acceleration Measurement System:
    • measures the quasi-steady acceleration regime ( f < 0.01 Hz ).
    • data can be mapped to any location (rigid-body assumed).
  • PIMS - the Principal Investigator Microgravity Services team maintains the acceleration data from the ISS and provides analysis and related services for investigators, sustaining engineering, and the microgravity community at-large.
capabilities and services1
Capabilities and Services

process & analyze



stream acceleration data from the ISS


  • Web access to: near real-time displays, acceleration archives, and tailored off-line requests
  • >10TB




SAMS/MAMS Sensor Locations


SE F02, MSG upper left seat track

SE F03, ER2 lower Z panel

SE F04, ER1 lower Z panel

SE F05, ER4 drawer 2

SE F08, ER3 seat track




MAMS in ER1(OSS and HiRAP)

microgravity environment components


More Localized with Increasing Frequency


Global (rigid body)

Microgravity Environment Components

a generic label NOT intended to quantitatively characterize platform


Three Aspects to Consider

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

Scheduling and Hardware Availability

  • Spatial
    • There are cable length, and sensor mounting considerations here.
    • Low-frequency vibrations tend to be global, so MAMS has you covered.
  • Temporal
    • SAMS and MAMS have a primary goal to operate continuously.
    • Kevin McPherson for SAMS sensor availability (SE-F02 is an APH candidate with other possible near-term/future requests for support from PaRIS & ESA).
  • Spectral
    • MAMS does not change its operating parameters.
    • For SAMS, it is best to request cut-off frequency that is low, yet above your highest frequency of interest or concern. Given enough advanced notice (about a day), SAMS sensors can be ground-commanded to a cut-off frequency in this set: 25, 50, 100, 200, or 400 Hz. If in doubt, then choose higher cut-off rather than lower, but be aware that there are some analysis trade-offs that favor lower-frequency cut-offs (i.e. sample rates). Usually, once cut-off is decided, we leave it at that value.

Data Analysis

  • Real-Time
    • PIMS web-site for near real-time auto-updating plots.
  • Off-Line
    • PIMS server for complete access to SAMS and MAMS data with 2-day lag from measurement time. You can self-serve for the processing and analysis you need at your site.
    • You can request tailored analysis from PIMS team.
  • “Roadmaps”
    • PIMS team publishes (via web) a standard set of analysis products to give an overview of the ISS microgravity environment.
    • For vibratory regime (SAMS) these are 8-hour spectrograms (magnitude versus frequency versus time).
    • For quasi-steady regime (MAMS) these are 8-hour, per-axis acceleration versus time plots.
photo of sams rts drawer
Photo of SAMS RTS Drawer

RTS Drawer 1

SN 121f02 In the Internal, Active Position

SN 121f03 in the Internal, Stowed Position

RTS Drawer 1

SN 121f02 In the internal, Active Position

SN 121f03 in the External, Deployed Position

photo of sams seat track device
Photo of SAMS Seat Track Device

SAMS RTS SE SN 121f08 Deployed on FSL in Columbus Module Using SAMS STD