Analysis and simulation of fully ankle actuated planar bipedal robots

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    Abstract

    This paper deals with the analysis of planar bipedal robots, based on passive dynamic walkers, which are actuated only by actuation of the ankle joints. An overview of the major design characteristics of such robots and their influence on the feasibility of a stable limit cycle is presented. It is shown that robots which are fully powered by ankle actuation require a mass ratio of at least 10:1 between the upper and lower limb to obtain sufficient ground clearance during the swing phase at a wide range of walking speeds. The effect and necessity of the offset in the footshapes of many passive dynamic walkers is shown and the influence of the moment of push off on the required energy injection is treated. The results of the analysis are supported by simulations with a dynamic model of such a robot. The simulated model exhibits a very natural looking gait and walks with a wide range of velocities at low mechanical cost of transport. Simulation results are provided which confirm that pushing off before the swing leg collides with the floor is energetically more efficient than pushing off after the impact as also known from previous literature.
    Original languageUndefined
    Title of host publicationIntelligent Robots and Systems, 2008. IROS 2008. IEEE/RSJ International Conference on
    PublisherIEEE
    Pages634-639
    Number of pages6
    ISBN (Print)978-1-4244-2057-5
    DOIs
    Publication statusPublished - 2008
    Event2008 IEEE/RSJ International Conference on Intelligent Robots and Systems, IROS 2008 - Nice, France
    Duration: 22 Sep 200826 Sep 2008

    Publication series

    Name
    Number412

    Conference

    Conference2008 IEEE/RSJ International Conference on Intelligent Robots and Systems, IROS 2008
    Abbreviated titleIROS
    CountryFrance
    CityNice
    Period22/09/0826/09/08

    Keywords

    • robot gait
    • EWI-14880
    • Legged locomotion
    • Robot dynamics
    • ankle actuated planar bipedal robots
    • METIS-255445
    • Simulation
    • passive dynamic walkers
    • swing leg
    • stable limit cycle
    • IR-71398
    • ankle joints

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