Moore, Nathan R. | Engineering Papers

NASA NTRS1992

A study to explore locomotion patterns in partial gravity environments

An effort is made to ascertain the factors affecting stability during locomotion in lunar and Martian gravity environments, as well as to establish criteria for the enhancement of stability and traction. The effects of changing both the speed and the pattern of locomotion under three different gravity conditions were investigated. As gravity level increased, vertical and horizontal forces significantly declined; similarities were noted across gravity levels, however, with respect to locomotion speed and pattern changes, where increasing speed enhanced both vertical and horizontal forces. With decreasing gravity, the ratio of horizontal to vertical forces increased significantly.

Rajulu, Sudhakar L.↗

NASA NTRS1992

An analysis of human performance in simulated partial-gravity environments

Three unique partial gravity test environments; parabolic flight, water immersion and a mechanical-relief device provide the environment to evaluate human locomotion, reach sweeps, and posture in the reduced gravity levels of the moon (1/6) and Mars (3/8). The development of a motion analysis database for 1/6 and 3/8 gravity environments as well as an initial understanding of human motion in low gravity environments are the focus of these experiments. Each of the three partial-gravity simulations provided a unique environment with some specific limitations. Water immersion provides a continuous testing environment but must factor in the effects of water viscosity drag, subject weighting, and breathing apparatus. Parabolic flight provides the most realistic testing environment although the test must be interrupted every 40 seconds to execute a complete parabolic maneuver of the aircraft. Mechanical force relief systems also provide uninterrupted testing. However, the body support harness necessary for use of mechanical force relief systems can potentially hinder test subject movement. By using the test results generated from all three test arenas, the Man-Systems Division will create a database of human locomotion specific to the lunar and Mars gravity environments. The information gathered is being used to enhance the development and design of future human habitation elements.

Moore, Nathan R.↗