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    The Effect of limb kinematics on the speed of a legged robot on granular media

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    The effect of limb kinematics on the speed of a legged robot on granular media.pdf (1.164Mb)
    Date
    2010-04-22
    Author
    Li, Chen
    Umbanhowar, Paul B.
    Komsuoglu, | Haldun
    Goldman, Daniel I.
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    Abstract
    Achieving effective locomotion on diverse terrestrial substrates can require subtle changes of limb kinematics. Biologically inspired legged robots (physical models of organisms) have shown impressive mobility on hard ground but suffer performance loss on unconsolidated granular materials like sand. Because comprehensive limb- ground interaction models are lacking, optimal gaits on complex yielding terrain have been determined empirically. To develop predictive models for legged devices and to provide hypotheses for biological locomotors, we systematically study the performance of SandBot, a small legged robot, on granular media as a function of gait parameters. High performance occurs only in a small region of parameter space. A previously introduced kinematic model of the robot combined with a new anisotropic granular penetration force law predicts the speed. Performance on granular media is maximized when gait parameters minimize body acceleration and limb interference, and utilize solidification features of granular media.
    URI
    http://hdl.handle.net/1853/46701
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    • Complex Rheology and Biomechanics Lab (CRAB LAB) [37]
    • Complex Rheology and Biomechanics Lab (CRAB LAB) Publications [37]

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