COMMENTS ON SEVERAL REDUCED - GRAVITY SIMULATORS USED FOR STUDYING LUNAR SELF - LOCOMOTIVE TASKS By Amos
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Rover Configuration for Exploring Lunar Craters
Configuration of locomotion for planetary rovers is motivated by increased interest in exploring lunar polar craters. Current rover designs cannot achieve the ascent or descent required by steep, unconsolidated lunar slopes. New designs must provide locomotive capability for steep climbing, techniques for controlling slip, and safely navigating down and along steep slopes. We propose a locomoti...
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Maintaining an upright posture on the moon is not easy. NASA documents abound with examples of astronauts falling on the moon during the visits between 1969 and 1972 (19,20). Even on the most recent moon visit (Apollo 17, 1972), Astronaut Harrison Schmidt fell over as he worked on the lunar surface.1 However, although regarded as highly desirable (7), few studies have investigated the perceptua...
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BACKGROUND On Earth only a few legged species, such as water strider insects, some aquatic birds and lizards, can run on water. For most other species, including humans, this is precluded by body size and proportions, lack of appropriate appendages, and limited muscle power. However, if gravity is reduced to less than Earth's gravity, running on water should require less muscle power. Here we u...
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BACKGROUND How space suits affect the preferred walk-run transition is an open question with relevance to human biomechanics and planetary extravehicular activity. Walking and running energetics differ; in reduced gravity (<0.5 g), running, unlike on Earth, uses less energy per distance than walking. METHODOLOGY/PRINCIPAL FINDINGS The walk-run transition (denoted *) correlates with the Froude...
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Quantifying the preferred transition speed (PTS) from walking to running has provided insight into the underlying mechanics of locomotion. The dynamic similarity hypothesis suggests that the PTS should occur at the same Froude number across gravitational environments. In normal Earth gravity, the PTS occurs at a Froude number of 0.5 in adult humans, but previous reports found the PTS occurred a...
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