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# Running on the moon

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### Running on the moon

1. 1. Francois Decuir
2. 2. Introduction In reduced gravity <0.5g, running requires less energy than walking • In space, the pressure inside space suits is high enough that it helps support the total weight http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal. pone.0006614#pone.0006614.s003
3. 3. Introduction Space suits affect the walk-run transition by mobility restriction, changes in stability, and increased joint mechanical work
4. 4. Introduction Froude Number  By modeling walking as an inverted pendulum, we find that walking occurs only when Fr≤1.
5. 5. Introduction Apollo Number  The Apollo number is defined as the Froude number multiplied by the inverse of the mass ratio M.  When no space suit is present, M=1 and Ap=Fr
6. 6. Variables v=velocity L=hip height or center of mass height M=ratio of human carried mass to total transported mass g=gravitational acceleration α&β=shape and location of the state transition
7. 7. Physiological The physiological variables include the length of the leg, L, and the mass ratio, M. When attempting to manipulate the Apollo number, the variable M can be changed. This can give either a higher or lower chance to be in a “run” state.
8. 8. Important models Change in M to keep the Apollo number constant. Probability that gait=1
9. 9. RecreationMATLAB was used to recreateWalk or Run state Apollo Number http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal. pone.0006614#pone.0006614.s003
10. 10. Alteration Lower space suitTo allow a shorter weight/Shorter hip heightastronaut to run at thesame speed as a taller Apollo Numberastronaut, the weight of Higher space suit weight/the space suit must be Longer hip heightaltered. Mass Ratio
11. 11. Possibilities Emergency situation occurs
12. 12. Benefits Optimizing space suits for travel to the Moon and Mars
13. 13. Conclusion In a suit with a higher mass, M, the walk-run transition will occur at lower speeds As loads reduce the self-support, M, walking becomes possible at higher velocities
14. 14. Questions