TEN YEARS IN LOCOMOTION CONTROL RESEARCH
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1 TEN YEARS IN LOCOMOTION CONTROL RESEARCH Jehee Lee Seoul National University
2 [SIGGRAPH 2010] Lee et al, Data-driven biped control
3 [SIGGRAPH 2010] Lee et al, Data-driven biped control
4 [SIGGRAPH 2010] Lee et al, Data-driven biped control
5 Hubo
6 Before 2007 After 2007 Simplified dynamics Model Fullbody dynamics Feedback only (stereotyped robotic walking) Feedback and feedforward (motion capture references) Analytic balance strategy Learning from experience Derivative-based optimization (conjugate-gradient, Newton, BFGS, ) Derivative-free optimization (CMA-ES)
7 Before 2007 After 2007 Simplified dynamics Model (inverted pendulum) Fullbody dynamics Feedback only (stereotyped robotic walking) Feedback and feedforward (motion capture references) Analytic balance strategy Computational model of balancing (regression, learning from experience, optimization at runtime) Derivative-based optimization (conjugate-gradient, Newton, BFGS, ) Derivative-free optimization (CMA-ES)
8 [SIGGRAPH 2007] Sok et al, Simulating Biped Behaviors from Human Motion Data
9 [SIGGRAPH 2010] Lee et al, Data-driven biped control
10
11
12 Before 2007 After 2007 Simplified dynamics Model (inverted pendulum) Fullbody dynamics Feedback only (stereotyped robotic walking) Feedback and feedforward (motion capture references) Analytic balance strategy Computational model of balancing (regression, learning from experience, optimization at runtime) Derivative-based optimization (conjugate-gradient, Newton, BFGS, ) Derivative-free optimization (CMA-ES)
13 Plausibility of Simulation Physical Correctness The simulation is correct with respect to Newton s law of motion No fictional force applies to the body Admissible Control Control force/torques are valid within muscle capacity GRF (ground reaction force) consistent with control force/torque
14 Plausibility of Simulation Type I (Strongly admissible) Simulation is physically correct and control is admissible Type II (weakly admissible) Simulation is physically correct, but control may not be admissible ex) GRFs are computed as optimization parameters independent of joint torques Type III (Visually plausible) Physical correctness is not guaranteed ex) Fictional force may apply at contact points
15 Dynamics Energertic Stability Balance Agility Low-energy Muscle Skin Tendon Modeling Pertubation Static Skeleton Applications Gait Analysis Humanoid Robot Robustness Video Games Biological Motion Simulation Social Group Quadruped Biped Emotion Fatigue Aging Adapation High-Level Behavior Interaction Flying Type
16 Dynamics Energertic Stability Balance Agility Low-energy Muscle Skin Tendon Modeling Pertubation Static Skeleton Applications Gait Analysis Humanoid Robot Robustness Video Games Biological Motion Simulation Social Group Quadruped Biped Emotion Fatigue Aging Adapation High-Level Behavior Interaction Flying Type
17 L Gait2562 (25 DOFs, 62 muscles) Gait2592 (25 DOFs, 92 muscles) Fullbody (39 DOFs, 120 muscles) [SIGGRAPH Asia 2014] Lee et al, Many-Muscle Humanoids
18 [SIGGRAPH Asia 2014] Lee et al, Many-Muscle Humanoids 18
19 Dynamics Energertic Stability Balance Agility Low-energy Muscle Skin Tendon Modeling Pertubation Static Skeleton Applications Gait Analysis Humanoid Robot Robustness Video Games Biological Motion Simulation Social Group Quadruped Biped Emotion Fatigue Aging Adapation High-Level Behavior Interaction Flying Type
20
21 Unilateral Painful Ankle Plantar Flexor Patients tend to reduce the use of the ankle plantar flexors
22
23 Painful Joints on Unilateral Limb Patients tend to reduce contact force
24
25 Painful Left Ankle Plantar Flexor Painful Joints on Left Leg
26 Waddling Gait Bilateral Gluteus Medius & Minimus Weakness Upper body swing laterally
27
28 Trendelenburg Gait Unilateral Gluteus Medius & Minimus Weakness
29
30 Dynamics Energertic Stability Balance Agility Low-energy Muscle Skin Tendon Modeling Pertubation Static Skeleton Applications Gait Analysis Humanoid Robot Robustness Video Games Biological Motion Simulation Social Group Quadruped Biped Emotion Fatigue Aging Adapation High-Level Behavior Interaction Flying Type
31 Balance and Stability Under what conditions is human gait more stable? What factors affect the level of stability? Are simulated walking as stable as human walking? Do the factors that affect human gait also influence controller stability?
32 [SIGGRAPH Asia 2015] Lee et al, Push-Recovery Stability
33
34 Four factors that affect gait stability Level of crouch Walking speed Magnitude of push Timing of push Crouch Gait is more stable than Normal Gait It detours less if it walks faster, push is weaker, and push happens later in the swing phase Similar trends for humans and simulation
35 Applications in Clinical Gait Analysis Surgery improves cerebral palsy gait by lengthening tight muscles/tendons and fixing bone deformity Predictive simulation of post-operative gaits from pre-operative motion capture and surgery planning
36 Dynamics Energertic Stability Balance Agility Low-energy Muscle Skin Tendon Modeling Pertubation Static Skeleton Applications Gait Analysis Humanoid Robot Robustness Video Games Biological Motion Simulation Social Group Quadruped Biped Emotion Fatigue Aging Adapation High-Level Behavior Interaction Flying Type
37 Papers & Videos are available at
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