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Thomas J. Griffin

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Publications by Thomas J. Griffin (bibliography)

1989

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Reaux, Ray A., Griffin, Thomas J. and Lewis, Ruthan (1989): Usability Testing and Requirements Derivation for EMU-Compatible Electrical Connectors. In: Proceedings of the Human Factors Society 33rd Annual Meeting 1989. pp. 144-148.

“On-orbit servicing of payloads is simplified when a spacecraft has been designed for serviceability. A key design criterion for a serviceable spacecraft is standardization of electrical connectors. The following research investigated the effects of extravehicular mobility unit (EMU) glove size, connector size, and connector type on usability of electrical connectors. An experiment was conducted exploring participants' ability to mate and demate connectors in an evacuated glovebox. Independent variables were two EMU glove-sizes, five connector size groups, and seven connector types. Significant differences in performance times and heart rate changes during mate and demate operations were found between EMU glove sizes, among connector types, and connector sizes. Subjective assessments of connectors were collected from participants with a usability questionnaire. The data were used to derive design recommendations for a National Aeronautics and Space Administration (NASA) recommended EMU-compatible electrical connector.”

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Barnby, Mary E., Griffin, Thomas J. and Lewis, Ruthan (1989): Neutral Buoyancy Methodology for Studying Satellite Servicing EVA Crewmember Interfaces. In: Proceedings of the Human Factors Society 33rd Annual Meeting 1989. pp. 149-153.

“Current economic constraints indicate the need for incorporating the satellite servicing philosophy of commonality within the design of spacecraft subsystems. This philosophy is essential for conserving resources including hardware/software development and implementation costs, on-orbit ground-based manpower, crew training/testing time, and documentation. In addition, spacecraft subsystem commonality may be coupled with standardization of operational procedures, and test and verification technique for spacecraft design. Several spacecraft have adapted this practice, including Hubble Space Telescope, Space Station Freedom, and the Explorer Platform. As these and other programs continue and if effective crew interfaces and procedures are clearly and consistently defined, crew retraining for similar spacecraft subsystems will lessen, and procurement efforts will diminish. A relatively high fidelity zero-gravity simulation using water immersion is available to establish crew interfaces economically. The flexibility and utility of this space simulation medium for planning and assisting on-orbit operations was exemplified by astronaut evaluations of potential extravehicular activity electrical connectors. The testing was conducted at a National Aeronautics and Space Administration underwater neutral buoyancy training facility.”

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