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Walking Robots Dr. Leonid Paramonov Course: TTK6 – Robotics 13.09.2013

Walking Robots Dr. Leonid Paramonov Course: TTK6 – Robotics 13.09.2013. Talk overview. Review of state of the art in walking robots Current walking robot project at ITK NTNU (student project opportunities). Walking robots classification.

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Walking Robots Dr. Leonid Paramonov Course: TTK6 – Robotics 13.09.2013

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  1. Walking Robots Dr. Leonid Paramonov Course: TTK6 – Robotics 13.09.2013

  2. Talk overview • Review of state of the art in walking robots • Current walking robot project at ITK NTNU (student project opportunities)

  3. Walking robots classification • “Quasi-static” humanoid robots or the ones based on typical topology of industrial robots • 2 dimensional walkers • Based on passive walking mechanisms • Biologically inspired robots • Dynamic multi-pedal robots * the current tendency in the field is in slow merging of different types of walking robot concepts

  4. Quasi-static topology Probably above 90% of all existing walking robots and the absolute majority of DIY robotics Relying on static stability of the structure depending on position of the centre of mass of the robot above robot's footprint In a sense the dynamical forces are not desired here because they mess up the stability (design conflict) Coordinated motion of multiple DoF's Difficulty in motion planning which is in many cases just pre-recorded trajectories Recent advances in the field

  5. Why industrial robot topology? Typical design – rigid links with cylindrical joints as DoFs controlled by geared DC/brushless motors Often the dynamical trajectory planning for industrial applications requires compensation of the dynamic forces to “free” the robot for a trajectory following task Conceptual problems of this robot topology • The worst possible place for a torque actuator • Effective inertia of the geared actuators JE = n2 * J, where n is the gearbox ratio • Design - “exponential law”

  6. Asimo, Honda In development since 1980s Very impressive recent developments like running, hopping on one and two feet

  7. High power legs by JSK Lab, Tokyo University

  8. Humanoid robots by Kawada Industries Inc. Closely related to JSK Lab in University Tokyo

  9. Viki humanoid by SDU, Odense, Denmark World champion in CoboCup 2002 free style competitions

  10. Petman, Boston Dynamics

  11. Atlas, Boston Dynamics Is being currently developed for DARPA Robotics Challenge

  12. 2D “Pole walkers” Spring Flamingo, MIT, Leg Lab

  13. 2D “Pole walkers” Rabbit, Grenoble, France

  14. 2D “Pole walkers” MABLE, University of Michigan

  15. Passive walkers Walking down a small inclination slope using potential energy

  16. Passive walkers Research passive walkers - energy efficient periodic gaits Actuated walkers using mechanical principles close to passive ones (example “Ranger” marathon walker by Cornell University)

  17. Biologically inspired dynamic walkers/runners (not only bipeds) Elastic compliant actuators, biologically inspired mechanical structures, dynamic periodic gaits Boston Dynamics: Big Dog, RoboMule, Cheetah (fastest running robot on Earth)

  18. Biologically inspired dynamic walkers/runners (not only bipeds) The Big Dog robot

  19. Biologically inspired dynamic walkers/runners (not only bipeds) The RoboMule robot

  20. Biologically inspired dynamic walkers/runners (not only bipeds) The Cheetah robot

  21. Biologically inspired dynamic walkers/runners (not only bipeds) MIT Cheetah robot Cheetah cub robot by EPFL

  22. Walking robot project Existing theoretical result for 2D walker

  23. Walking robot project 2D “Pole walker”, 2 passive degrees of freedom, 1 actuator Theoretical challenges • Nonlinear control of periodic motions • Trajectory planning with ground collisions • Controller design

  24. Walking robot project Design challenges • Purpose built for verification of a specific theoretical results • Direct drive actuator without gear • Integration • Experiments

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