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Designing for Reliability and RobustnessLong duration spaceflight has a negative effect on the human body, and exercise countermeasures are used on-board the International Space Station (ISS) to minimize bone and muscle loss, combatting these effects. Given the importance of these hardware systems to the health of the crew, this equipment must continue to be readily available. Designing spaceflight exercise hardware to meet high reliability and availability standards has proven to be challenging throughout the time the crewmembers have been living on ISS beginning in 2000. Furthermore, restoring operational capability after a failure is clearly time-critical, but can be problematic given the challenges of troubleshooting the problem from 220 miles away. Several best-practices have been leveraged in seeking to maximize availability of these exercise systems, including designing for robustness, implementing diagnostic instrumentation, relying on user feedback, and providing ample maintenance and sparing. These factors have enhanced the reliability of hardware systems, and therefore have contributed to keeping the crewmembers healthy upon return to Earth. This paper will review the failure history for three spaceflight exercise countermeasure systems identifying lessons learned that can help improve future systems. Specifically, the Treadmill with Vibration Isolation and Stabilization System (TVIS), Cycle Ergometer with Vibration Isolation and Stabilization System (CEVIS), and the Advanced Resistive Exercise Device (ARED) will be reviewed, analyzed, and conclusions identified so as to provide guidance for improving future exercise hardware designs. These lessons learned, paired with thorough testing, offer a path towards reduced system down-time.
Document ID
20160008094
Acquisition Source
Johnson Space Center
Document Type
Conference Paper
Authors
Svetlik, Randall G. (Jacobs Technology, Inc. Houston, TX, United States)
Moore, Cherice (NASA Johnson Space Center Houston, TX, United States)
Williams, Antony (Jacobs Technology, Inc. Houston, TX, United States)
Date Acquired
June 29, 2016
Publication Date
March 4, 2017
Subject Category
Aerospace Medicine
Report/Patent Number
JSC-CN-36579
Meeting Information
Meeting: 2017 IEEE Aerospace Conference
Location: Big Sky, MT
Country: United States
Start Date: March 4, 2017
End Date: March 11, 2017
Sponsors: Institute of Electrical and Electronics Engineers
Distribution Limits
Public
Copyright
Public Use Permitted.

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