Predicting Fatigue for Isolated Joints While Wearing an Extra-vehicular Mobility Unit (EMU) NASA JSC

Format:

Conference/Event

Author/Creator:

Maida, James C., author.

Conference Name:

Digital Human Modeling For Design And Engineering Conference And Exhibition (2001-06-26 : Arlington, Virginia, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2001

Summary:

To work outside a space craft, humans must wear a protective suit. The required suit pressurization creates additional resistance for the wearer while performing work. How much does the suit effect work and fatigue? To answer these questions, dynamic torque was collected for the shoulder, elbow and wrist for six subjects in an Extra-vehicular Mobility Unit (EMU). In order to quantify fatigue, the subjects were to exert maximum voluntary torque for five minutes or until their maximum fell below 50% of their initial maximum for three consecutive repetitions. Using the collected torque and time data, logarithmic based functions were derived to estimate torque decay to within an absolute error of 20%. These results will be used in the development of a generalized tool for prediction of maximum available torque over time for humans using the current EMU

Notes:

Vendor supplied data

Publisher Number:

2001-01-2099

Access Restriction:

Restricted for use by site license