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Defining Constellation Suit Helmet Field of View Requirements Employing a Mission Segment Based Reduction ProcessField of view has always been a design feature paramount to helmet design, and in particular space suit design, where the helmet must provide an adequate field of view for a large range of activities, environments, and body positions. For Project Constellation, a slightly different approach to helmet requirement maturation was utilized; one that was less a direct function of body position and suit pressure and more a function of the mission segment in which the field of view is required. Through taxonimization of various parameters that affect suited FOV, as well as consideration for possible nominal and contingency operations during that mission segment, a reduction process was able to condense the large number of possible outcomes to only six unique field of view angle requirements that still captured all necessary variables without sacrificing fidelity. The specific field of view angles were defined by considering mission segment activities, historical performance of other suits, comparison between similar requirements (pressure visor up versus down, etc.), estimated requirements from other teams for field of view (Orion, Altair, EVA), previous field of view tests, medical data for shirtsleeve field of view performance, and mapping of visual field data to generate 45degree off-axis field of view requirements. Full resolution of several specific field of view angle requirements warranted further work, which consisted of low and medium fidelity field of view testing in the rear entry ISuit and DO27 helmet prototype. This paper serves to document this reduction progress and followup testing employed to write the Constellation requirements for helmet field of view.
Document ID
20080046980
Acquisition Source
Johnson Space Center
Document Type
Conference Paper
Authors
McFarland, Shane M.
(MEI Technologies, Inc. Houston, TX, United States)
Date Acquired
August 24, 2013
Publication Date
January 1, 2008
Subject Category
Man/System Technology And Life Support
Meeting Information
Meeting: International Conference on Environmental Systems
Location: Savannah, GA
Country: United States
Start Date: July 12, 2009
End Date: July 16, 2009
Sponsors: Society of Automotive Engineers, Inc.
Funding Number(s)
OTHER: 731384
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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