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kevin.m.mcpherson@nasa thomas.h.stonge@nasa

NASA Glenn Research Center (GRC) Acceleration Measurement and Analysis Projects Over a Decade of Support for the International Space Station. kevin.m.mcpherson@nasa.gov thomas.h.stonge@nasa.gov. Outline. If time allows, then backup slides with some interesting details.

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kevin.m.mcpherson@nasa thomas.h.stonge@nasa

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  1. NASA Glenn Research Center (GRC)Acceleration Measurement and Analysis ProjectsOver a Decade of Support for the International Space Station kevin.m.mcpherson@nasa.gov thomas.h.stonge@nasa.gov

  2. Outline If time allows, then backup slides with some interesting details. Capabilities and Services Science Support and Customers Timeline of Acceleration System Deployment Current Sensor Locations Basics of the Microgravity Environment Roadmaps for the Microgravity Environment When Should I Run My Experiment? Brief Characterization of Some Disturbances

  3. 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: • the ability to instrument and measure the vibratory regime in all 3 of the ISS labs, including throughout the USL ( 0.01  f  300 Hz ). • VCB 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.

  4. Capabilities and Services process & analyze 24x7 SAMS & MAMS stream acceleration data from the ISS to NASA GRC • Web access to: near real-time displays, acceleration archives, and tailored off-line requests • http://pims.grc.nasa.gov • pimsops@grc.nasa.gov 8.2TB Accel. Archive

  5. Outline Capabilities and Services Science Support and Customers Timeline of Acceleration System Deployment Current Sensor Locations Basics of the Microgravity Environment Roadmaps for the Microgravity Environment When Should I Run My Experiment? Brief Characterization of Some Disturbances

  6. Science Support and Customers • NASA’s Physical Sciences Research Program conducts fundamental & applied research with experiments in: • Fluid Physics • Combustion Science • Materials Science • Fundamental Physics • Complex Fluids • SAMS/MAMS were designed to support these disciplines, and along with PIMS for analysis, these NASA GRC projects also fill an ongoing role in support of: • Vehicle Loads and Dynamics Monitoring • Technology Developers

  7. Outline Capabilities and Services Science Support and Customers Timeline of Acceleration System Deployment Current Sensor Locations Basics of the Microgravity Environment Roadmaps for the Microgravity Environment When Should I Run My Experiment? Brief Characterization of Some Disturbances

  8. Timeline of Acceleration System Deployment SAMS TSH-ES (Compact Ethernet Standalone) (0.01 to 300 Hz) Station Vibratory SAMS RTS (Ethernet Distributed) (0.01 to 300 Hz) Station Vibratory MAMS HiRAP (0.01 to 100 Hz) Station Vibratory MAMS OSS (DC to 1 Hz) Station Quasi-Steady RRS (0.1 arc/s) 1 sounding rocket, 1 shuttle TSH-FF (0.01 to 200 Hz) 3 sounding rocket, 2 shuttle on ISS from 2001 through 2028 2012 YEAR

  9. Current Sensor Locations SAMS 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 TSH-ES05, CIR TSH-ES06, FIR ----------------------------------------------- MAMS in ER1(OSS and HiRAP)

  10. Outline Capabilities and Services Science Support and Customers Timeline of Acceleration System Deployment Current Sensor Locations Basics of the Microgravity Environment Roadmaps for the Microgravity Environment When Should I Run My Experiment? Brief Characterization of Some Disturbances

  11. MAMS SAMS Basics of the Microgravity Environment a generic label, not intended to quantitatively characterize the platform

  12. 24 hours Roadmap for Vibratory Regime spectrogram is a “roadmap” that shows boundaries and structure in time and frequency Qualify Quantify BASS Ops  FREQUENCY TIME MAGNITUDE Crew Wake MSG facility equipment turns on/off Crew Exercise Ku-band Antenna

  13. 4 DAYS Roadmap for Quasi-Steady Regime pk2pk = 90 ng 90 minutes -60 ng

  14. Outline Capabilities and Services Science Support and Customers Timeline of Acceleration System Deployment Current Sensor Locations Basics of the Microgravity Environment Roadmaps for the Microgravity Environment When Should I Run My Experiment? Brief Characterization of Some Disturbances

  15. When Should I Run My Experiment? TIME (4 hr chunks) RMS statistics min(median) …well, if you are in the US LAB, near the MSG (where SAMS sensor 121f02 is located), then your best 4-hour span is GMT hours 02 to 06

  16. When Should I Run My Experiment? min(median) …but, if you are in the Columbus module, near ER3(where SAMS sensor 121f08 is located), then your best 4-hour span is GMT hours 01 to 05

  17. Outline Capabilities and Services Science Support and Customers Timeline of Acceleration System Deployment Current Sensor Locations Basics of the Microgravity Environment Roadmaps for the Microgravity Environment When Should I Run My Experiment? Brief Characterization of Some Disturbances

  18. Brief Characterization of Some Disturbances

  19. Backup Slides for Details on… • Mode One • Ku-band Antenna • ATV3 Reboost • ARIS Attenuation during FIR Ops • Historical Look at Sensor Locations

  20. “Mode One” – First Mode of Main Truss • In general, for structural mode regime below 3 Hz: • is excited by crew activity and impulsive events • RMS levels are nominally: • ~ 30 ugRMS for USL • ~ 40 ugRMS for COL and JEM • Mode One: • is monitored daily for structural integrity & off-nominal impacts • in Sept. 2012, nominal RMS levels were: • < 2 ugRMS for USL • < 3 ugRMS for COL and JEM SLEEP WAKE DC - 1 Hz 0.1 Hz

  21. Ku-Band Antenna, Qualify • Frequency range ~ 5 to 17 Hz • Orbital variations to track “current” satellite • Sporadic events to acquire “next” satellite Ku-band Antenna Frequency Range

  22. Ku-Band Antenna, Quantify10-Minute Interval RMS, 5 < f < 17 Hz 10-min. interval RMS TIME (total of 6 days) ugRMS daily cycle SAMS 121f08 in COL GMT (2012)

  23. ATV3 Reboost GMT 31-Mar-2012 remarkably similar BEFORE 0 < f < 200 Hz DURING x-axis 1.4 mgRMS x-axis 1.3 mgRMS Acceleration TIME y-axis 1.0 mgRMS y-axis 1.0 mgRMS ± 10 mg z-axis 1.2 mgRMS z-axis 1.1 mgRMS

  24. ATV3 Reboost GMT 31-Mar-2012 BEFORE 0 < f < 6 Hz DURING x-axis 0.3 mg step duration ~7min y-axis structural mode excitation ± 1 mg

  25. ARIS Attenuation During FIR Ops 20Hz X ARIS OFF Per-Axis Power Spectral Density ARIS ON Y Frequency (Hz) TUNING Z

  26. Historical Look at Sensor Locations Collectively, SAMS & MAMS Sensors Have Been Mounted in 21 Unique Locations PreviousCurrent

  27. Plans to participate in…

  28. System Performance

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