Version Used During Extravehicular Activity Experiments
For ambulation data, a state-of-the-art Vicon MX motion-capture system (Vicon, Oxford, England) was used to capture the kinematic data. Custom-made camera mounting frames were made by the Anthropometry and Biomechanics Facility (ABF) to ensure the stability of the cameras during flight, which is critical to collecting accurate data. The camera rack was also modified from a square rack type of mount in phase I, with the cameras spread across the crosspieces, to separated posts that were spread farther apart in phase II. This was done to increase the viewing, or capture volume and increase the number of markers visible at any one time. In the exploration area, six cameras were mounted on RGO-approved poles. Three cameras were on each side of the exploration area. The cameras were positioned to focus only on the feet needed for center-of pressure analysis.
A mass-support rig was designed and attached to the MKIII suit Primary Life Support System (PLSS) mockup during portions of the EVA testing. The structure was reconfigurable: weights could be moved to different locations to achieve a desired suit mass and/or center of gravity (CG). The mass of the mass-support rig was about 29.5 kg (65 lb) and each weight set (one on each arm of the support structure) was 30.6 kg (67.5 lb).