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Project Title:  Combined whole-body vibration plus G-loading influences on visual performance and operator ratings Reduce
Fiscal Year: FY 2008 
Division: Human Research 
Research Discipline/Element:
HRP SHFH:Space Human Factors & Habitability (archival in 2017)
Start Date: 05/21/2008  
End Date: 11/30/2008  
Task Last Updated: 09/17/2009 
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Principal Investigator/Affiliation:   Kaiser, Mary  Ph.D. / NASA Ames Research Center 
Address:  MAIL STOP 262-2 
Moffett Field , CA 94035 
Phone: 650-604-4448  
Congressional District: 18 
Organization Type: NASA CENTER 
Organization Name: NASA Ames Research Center 
Joint Agency:  
Project Information: 
Responsible Center: NASA JSC 
Grant Monitor: Woolford, Barbara  
Center Contact: 218-483-3701 
Solicitation / Funding Source: Directed Research 
Project Type: GROUND 
Flight Program:  
TechPort: No 
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Human Research Program Elements: (1) SHFH:Space Human Factors & Habitability (archival in 2017)
Human Research Program Risks: (1) Hab:Risk of an Incompatible Vehicle/Habitat Design
Human Research Program Gaps: (1) SHFE-HAB-03:We need to understand how new aspects of the natural and induced environment (e.g., vehicle/habitat architecture, acoustics, vibration, lighting) may impact performance, and need to be accommodated in internal vehicle/habitat design (IRP Rev E)
Task Description: Recent engineering analyses of the integrated Ares-Orion stack show that vibration levels for Orion crews have the potential to be much higher than those experienced in Gemini, Apollo, and Shuttle vehicles. Of particular concern to the Constellation Program (CxP) is the 12 Hz thrust oscillation (TO) that the Ares-I rocket develops during the final ~20 seconds preceding first-stage separation, at maximum G-loading.

While the structural-dynamic mitigations being considered can assure that vibration due to TO is reduced to below the CxP crew health limit, it remains to be determined how far below this limit vibration must be reduced to enable effective crew performance during launch. Moreover, this “performance” vibration limit will inform the operations concepts (and crew-system interface designs) for this critical phase of flight. While Gemini and Apollo studies provide preliminary guidance, the data supporting the historical limits were obtained using less advanced interface technologies and very different operations concepts.

We performed two sets of studies. The first set dealt with display readability and has already been presented to the HRP community. In this poster, we present the second set, which deals with display usability. In the first study, Crew Office participants were asked to judge the degree of usability impairment as vibration ramped up and down. Three different display formats (Textual, 1-D Gauges, 2-D Graphics) were evaluated. In the second study, we studied whether judgments were impacted by vibration frequency and composition (i.e., a pure sine wave versus one with harmonic remnants).

The results from these empirical studies, coupled with the findings from the complementary studies on display readability, provide initial guidance for evaluating the display trade-space for Constellation vehicles and systems.

Research Impact/Earth Benefits: 0

Task Progress & Bibliography Information FY2008 
Task Progress: New project for FY2008.

[Ed. note: added to Task Book September 2009]

Bibliography Type: Description: (Last Updated: ) 

Show Cumulative Bibliography Listing
 None in FY 2008