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A Human Factors Analysis of EVA Time RequirementsHuman Factors Engineering (HFE) is a discipline whose goal is to engineer a safer, more efficient interface between humans and machines. HFE makes use of a wide range of tools and techniques to fulfill this goal. One of these tools is known as motion and time study, a technique used to develop time standards for given tasks. During the summer of 1995, a human factors motion and time study was initiated with the goals of developing a database of EVA task times and developing a method of utilizing the database to predict how long an EVA should take. Initial development relied on the EVA activities performed during the STS-61 (Hubble) mission. The first step of the study was to become familiar with EVA's, the previous task-time studies, and documents produced on EVA's. After reviewing these documents, an initial set of task primitives and task-time modifiers was developed. Data was collected from videotaped footage of two entire STS-61 EVA missions and portions of several others, each with two EVA astronauts. Feedback from the analysis of the data was used to further refine the primitives and modifiers used. The project was continued during the summer of 1996, during which data on human errors was also collected and analyzed. Additional data from the STS-71 mission was also collected. Analysis of variance techniques for categorical data was used to determine which factors may affect the primitive times and how much of an effect they have. Probability distributions for the various task were also generated. Further analysis of the modifiers and interactions is planned.
Document ID
19970026898
Acquisition Source
Headquarters
Document Type
Other
Authors
Pate, Dennis W.
(Texas A&M Univ. College Station, TX United States)
Date Acquired
August 17, 2013
Publication Date
June 1, 1997
Publication Information
Publication: National Aeronautics and Space Administration (NASA)/American Society for Engineering Education (ASEE) Summer Faculty Fellowship Program: 1996
Volume: 2
Subject Category
Man/System Technology And Life Support
Accession Number
97N26041
Funding Number(s)
CONTRACT_GRANT: NGT-44-001-800
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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