EVA Results of Shuttle Mission STS-37

Whitsett, C. E.; Gall, Lisa A.; Trevino, Luis

doi:10.4271/921339

Cited by 2 publications

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“…In addition, recent efforts have been made to quantify a suited astronaut's torquing capability (Whitsett, et al, 1992) and unsuited operator strength capability (Poliner, et al, 1994), but quantification of the loads induced on the restraint hardware during maintenance operations has not been completed.…”

Section: Introductionmentioning

confidence: 99%

Influence of a Pitch Adjustable Foot Restraint on Operator Induced Loads in Zero-Gravity

Wilmington

Poliner

Klute

1994

Proceedings of the Human Factors and Ergonomics Society Annual

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The zero-gravity environment creates a need for a proper human body restraint system to maintain a comfortable posture which lessens fatigue and maximizes productivity. In addition, restraint systems must be able to meet the loading demands of maintenance and assembly tasks performed on-orbit. The Shuttle's primary intravehicular astronaut restraint system is currently a foot loop design that attaches to flat surfaces. This restraint system allows for variation in mounting locations and ease of ingress and egress. However, this design limits performance because it does not atlow for elevation, pitch, or foot loop length adjustment. Several prototype foot restraint systems are being evaluated for use aboard Space Station and the Space Shuttle. A study was initiated using NASA's reduced gravity aircraft quantifying differences observed in operator performance while adjusting the pitch angle of a prototype foot restraint. Pitch angle adjustments were made from 5" to 35' . While operators performed a torque wrencb task using a hand hold and foot restraint, the maximum axial forces and moments induced on the restraint systems and torque wrench were recorded. Overall this study did not see any significant difference in the force operators could place on tbe torque wrench or forces imparted to the foot restraint system due to the pitch orientation of the foot restraint. Thus in a work environment in which hand holds are available, no significant influence of the pitch angle existed for operator performance or forces imparted to the restraint system.

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Section: Introductionmentioning

confidence: 99%

Influence of a Pitch Adjustable Foot Restraint on Operator Induced Loads in Zero-Gravity

Wilmington

Poliner

Klute

1994

Proceedings of the Human Factors and Ergonomics Society Annual

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“…Several recent studies at NASA have focused on the strength of individuals wearing a spacesuit in weightlessness performing various tasks (Whitsett, et al, 1992;Rajulu et al, 1993). Besides these studies, strength data from individuals performing specific, controlled tasks in weightlessness does not seem to exist.…”

Section: Introductionmentioning

confidence: 99%

Strength Capabilities While Performing Torquing Tasks in Weightlessness

Poliner

Wilmington

Klute

1994

Proceedings of the Human Factors and Ergonomics Society Annual

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Knowledge of individuals' strength capabilities in weightlessness is of interest within many areas of NASA, including workplace design, tool development, and mission planning. This study was a generic examination of the loads produced by individuals performing maximal efforts with a torquing tool in zero-gravity. The study also examined the effects of orientation and direction of rotation of the tool on strength effectiveness. An experiment was conducted aboard NASA's reduced gravity aircraft which simulates brief periods of weightlessness. A test stand was developed and instrumented to measure the loads applied to fixed fittings. Eight male volunteers participated in this study in which they used a wrench to apply a maximum torque to fittings oriented along each of three orthogonal axes. It was seen that these subjects could produce approximately 400 to 750 N of force, depending on the orientation of the tool and the direction of effort. The most force could be produced when pushing the tool upwards. A force effectiveness ratio (FER) was defined as an indication of how much of the subject's total effort actually went into performing the desired task. Values of FER ranged from 0.55 to 0.90, with the greatest FER occurring with UP and DOWN efforts, and the lowest with AWAY and LEFT efforts. Designers can use these results to set specifications for craft structures; tools can be developed based on the known strength of the tool users; and tasks can be developed to not exceed the crewmembers' capabilities.

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EVA Results of Shuttle Mission STS-37

Cited by 2 publications

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Influence of a Pitch Adjustable Foot Restraint on Operator Induced Loads in Zero-Gravity

Influence of a Pitch Adjustable Foot Restraint on Operator Induced Loads in Zero-Gravity

Strength Capabilities While Performing Torquing Tasks in Weightlessness

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