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The Human PoWeR Laboratory Physiology ofof Wearable Robotics Dr. Gregory S. Sawicki

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Presentation on theme: "The Human PoWeR Laboratory Physiology ofof Wearable Robotics Dr. Gregory S. Sawicki"— Presentation transcript:

1 The Human PoWeR Laboratory Physiology ofof Wearable Robotics Dr. Gregory S. Sawicki e-mail: gssawick@ncsu.edu

2 MECHANICS ENERGETICS NEURAL CONTROL Lower-limb Joints Muscle-Tendon Units Muscles Whole-Body

3 Carbon fiber shank Polypropylene foot Artificial Pneumatic Muscle Load Cell Compressed air via nylon tubing Steel hinge joint Moment arm ~10 cm Bilateral Powered Ankle Exoskeletons Total Mass ~ 1.1 kg < 5% M body

4 Proportional Myoelectric Control Powered Ankle Exoskeleton with Artificial Muscle SOL EMG Computer Interface Plantar Control Signal Pressure Regulator

5 Uphill: 15% grade @ 1.25 m/s Powered Walking: O 2 Consumption

6 Energy Savings: Powered Assistance Net Metabolic Power (W/kg) 0 10 0 5 15 Unpowered Powered -13% * -11% * -12% * -10% * Surface Gradient (%) Sawicki, Ferris J Exp Biol (2009b) 1.25 m/s 9 SUBJECTS

7 Push-Button Control Push ButtonControl Signal Pressure Regulators Computer Interface Therapist Control A. Therapist Control Patient Control B. Patient Control Sawicki et al. JNER (2006).

8 In Vitro Muscle-Tendon Work Loops Specified Muscle Stimulation Timing Specified Muscle-Tendon Length Trajectory Signal Generator Length Stim Muscle-Tendon (MT) Frog Plantaris Muscle Fibers (CE ) Achilles’ Tendon (SEE) Electrical Stim Muscle Stimulation Amplitude, Duration Sonomicrometer CE Length MT Length Muscle Ergometer Muscle Force

9 Protocol: Activation Onset Phase % 250 ms (4 Hz) 0 -4 +4 0% Muscle-Tendon Length Trajectory (mm) + Lengthening - Shortening -12.5% +12.5% +25.0% +37.5% +50.0% 100 ms 40% duty

10 Muscle-Tendon Force and Length N=6 Cycle (%) 4 0 -6 10 5 0 Stimulation Period Muscle (CE) Δ Length (mm) Force (N/g) Tendon (SEE) Δ Length (mm) 7 0 14 10050 0 100 ms

11 Imaging: Manipulate Muscle-Tendon force with Parallel Elastic Ankle Exoskeleton Parallel Elastic Exoskeleton + Rotating Platform Force Platform 1. External Forces 2. Joint Kinematics Ultrasound Probe Muscle-Tendon Junction Position 3. Muscle + Tendon Lengths 4. Electromyography 5. Metabolic Cost In Vivo Muscle-Tendon

12 MUSCLE ERGOMETER SONOMICROMETER ELECTRICAL STIMULATOR or PNEUMATIC VALVES BIOLOGICAL MUSCLE-TENDON or ARTIFICIAL MUSCLE-TENDON Feedback Control: VIRTUAL BODY DYNAMICS Muscle-Tendon Length Change Muscle-Tendon Force VIRTUAL NERVOUS SYSTEM Feedforward + Feedback Muscle Activation Muscle Length and Velocity (i.e. Ia, II) (i.e. Ib) In Vitro Muscle-Tendon

13 Design: Sawicki et al. JNER (2009). Wearable Robots and Elastic Actuators

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