Motion Planning of Extreme Locomotion Maneuvers Using Multi-Contact Dynamics and Numerical Integration
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1 Motion Planning of Extreme Locomotion Maneuvers Using Multi-Contact Dynamics and Numerical Integration and Mike Slovich The Human Center Robotics Laboratory (HCRL) The University of Texas at Austin Humanoids 2011,Bled, Slovenia October 28 th, 2011
2 What Are Extreme Maneuvers (EM)? (Generalization of recreational free-running) Tackles discrete surfaces and near-vertical terrains Needed for humanoids, assistive devices and biomechanical studies
3 Objectives of the research Develop new dynamical models and numerical techniques to predict, plan and analyze EM Develop whole-body adaptive torque controllers to execute the motion plans and the desired multi-contact behaviors Build a nimble bipedal robot to verify the methods
4 State of the art Rough terrain still dominated by methods that do not taking into account friction characteristics No generalization of gait to discrete terrains with near-vertical surfaces Multicontact dynamics are largely overlooked Linearization is too commonly used instead of tackling the full nonlinear problems
5 Our approach to EM Model multicontact and single-contact dynamics Develop geometric path dependencies Use path dependencies to reduce dimensionality of the dynamic problems Derive set of rules for feasible geometric paths Given step conditions, use numerical integration to predict the nonlinear behavior in forward and backward times Choose as the contact planning strategy the intersections in state space of maneuvering curves Conduct comparative analysis with a human
6 Let s start with multicontact dynamics Hands and feet are in contact a com f r f r(lf) a com f t f r(rf) m n f t In IROS 09, TRO 10 we presented the Virtual Linkage Model and the Multi-Contact / Grasp Matrix for humanoids Only feet are in contact
7 Model for single-contact dynamics (established area of research) - Non-linear pendulum dynamics (balance of inertialgravitational-reaction moments) actuated linear motor v(0) cop = center of pressure (contact point) The form of the model is: passive hinge Solving multivariate NL systems is difficult z y x
8 Resort to modeling arbitrary geometric paths z x Geometric dependencies are model as:
9 Dimensional Reduction of Models Using the previous dependencies the actuated non-linear pendulum becomes The model becomes now an ODE:
10 v com Given the piecewise linear model analyze feasible geometric paths x v com x f motor v(0) passive FALL!! is angle of attack
11 Example: design of geometric path GOOD! UNFEASIBLE
12 If we consider non-linear geometric paths, dynamics are non-linear
13 Then, prediction by Numerical Integration Establishing geometric dependencies: Consider discrete solutions (Taylor expansion): Time perturbation is: Reduction of single contact dynamics (Non linear behavior): State space solution:
14 Examples: (Forward/Backward Propagation)
15 Solving the multicontact behavior FRICTION CONE
16 Planning of contact transitions Apex BWD FWD Search-based to reach apex with zero velocity FWD Apex
17 Entire leaping planning strategy
18 Results and Comparison with Human PLANNER HUMAN HUMAN PLANNER
19 Movie
20 Details design of Hume
21 Design setpoint CoM Path Rough Terrain 0.4 m
22 Questions
23 Supporting slides
24 How is that possible? In the absence of forces -> parabola g f m 0 v(0)
25 Angle of attack negative 0 a com x 0 f m 0 v(0) g
26 Angle of attack positive a com x 0 0 g Details on forces f m 0 v(0) f m 0 f m f total Mg
27 Side and Front of Hume
28 Mechatronics
29 Unused slides
30 Let s start with multicontact dynamics Hands and feet are in contact a com f r f r(lf) a com f t f r(rf) m n f t In IROS 09, TRO 10 we presented the Virtual Linkage Model and the Multi-Contact / Grasp Matrix for humanoids Only feet are in contact
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