Biomechanical Vitality Transformation.


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Human-Portable Energy. Multiplication of Portable Electronics: cellular telephones. versatile ... low power hardware - mW and underneath - with new innovations ...
Transcripts
Slide 1

Biomechanical Energy Conversion Patrick L. Chapman Assistant Professor Power Affiliates Program Review, 2003 Sponsored by Office of Naval Research Grainger Center for Electric Machinery and Electromechanics

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Human-Portable Energy Proliferation of Portable Electronics: cell telephones versatile PCs "wearable" PCs individual computerized collaborators Others to come? low power hardware - mW and beneath - with new advances Grainger Center for Electric Machinery and Electromechanics

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Batteries Primary wellspring of individual convenient vitality Storage lead corrosive: 30 W-h/kg 40 kg human; assume 4 kg of batteries (10 %) 120 W for 1 hour PC, around 50-200 W PDA, up to 30 W NiMH, Li-Ion: 30-100 W-h/kg Rechargable Relatively "clean" vitality Grainger Center for Electric Machinery and Electromechanics

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Other Significant Options Combustibles little stream fuel motors (JP8) Fuel Cells $$$ (at any rate until further notice) much more unpredictable than promoted \'clean\', yet fuel still at last restricted Grainger Center for Electric Machinery and Electromechanics

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Biomechanical Energy Conversion Relatively new, undiscovered alternative Goal: harvest vitality from generally squandered human movement "clean" vitality most likely renewable (sustenance utilization) boundless vitality moderately constrained power less restricted for blasts calm Grainger Center for Electric Machinery and Electromechanics

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Commercially Available, Human Powered Shavers Radios Flashlights Wristwatch vibration/flywheel component Night vision scopes Grainger Center for Electric Machinery and Electromechanics

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Mobile US Marine Power About 8 W consistent catalyst to 25 W blasts Grainger Center for Electric Machinery and Electromechanics

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Conceptual Portable Energy System Grainger Center for Electric Machinery and Electromechanics

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Potential Sources? as indicated by Prospector IX: Human Powered Systems Technology, Space Power Institute, Auburn U., 1997 Grainger Center for Electric Machinery and Electromechanics

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Identifying Potential Sources Present information extremely inadequate For now, concentrate on generally expansive force Work with biomechanics specialists Prof. Xudong Zhang and understudies, MIE, UIUC distinguish and evaluate the best hopeful movements for force evaluate the weakness element for competitor movements complete analyses on human subjects Grainger Center for Electric Machinery and Electromechanics

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Typical Biomechanical Link Model, figure constrain, speed, and power for movements Estimate weariness under given burdens Confirm with information from our biomechanics lab Grainger Center for Electric Machinery and Electromechanics

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Test and Measurement Biomechanics lab 5-camera advanced catch framework response power stage electromyography (raises contention for muscle exhaustion estimations) Two human subjects tests arranged Grainger Center for Electric Machinery and Electromechanics

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Challenges in Electromechanics Evaluate materials Identify, assess topologies New generator outlines development, position on body Construction and testing Grainger Center for Electric Machinery and Electromechanics

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Materials Better known Piezoelectric Electrostatic Magnetic Research level polymers other fascinating materials Grainger Center for Electric Machinery and Electromechanics

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Piezoelectric Compression/pressure developments Compact, lightweight Form fitting conceivable Subject of most biomechanical vitality transformation work heel strike vitality recuperation up to 5 W reported Grainger Center for Electric Machinery and Electromechanics

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Effective Mass; Heel Strike Starner, "Human Powered Wearable Computing," IBM Systems Journal Grainger Center for Electric Machinery and Electromechanics

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Shoe with Implants Starner, "Human Powered Wearable Computing," IBM Systems Journal Grainger Center for Electric Machinery and Electromechanics

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Electrostatics Use pressure/strain between parallel plates Use encompassing or purposeful vibration to bring about relative movement between plates Electrostatics tractable just if little air holes (microns) because of field breakdown restricted to 40 J/m 3 for perceptible application Grainger Center for Electric Machinery and Electromechanics

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Magnetic machines Clearly the best for naturally visible applications 1 T field  400 kJ/m 3 far reaching use, covering almost all electric hardware Standard rotating setups not direct to adjust to this application One of the heel-strike papers demonstrates a case, however not deliberately designed at all Prior results use "MEMS" vibration recuperation, low power, yet conceivable Grainger Center for Electric Machinery and Electromechanics

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Topologies Magnetic ought to likely be the principle center Which worldview of machines is ideal? hesitance, actuation, lasting magnets, mixes match to movement mass expense and execution tradeoffs Grainger Center for Electric Machinery and Electromechanics

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Range of Motion, Degrees of Freedom Rotary or straight? relies on upon development Why not both? Why not various degrees of flexibility? Grainger Center for Electric Machinery and Electromechanics

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Induction machines Force originates from collaboration between streams on portable and stationary individuals Difficult to legitimize in stand-alone applications Inexpensive, surely knew Grainger Center for Electric Machinery and Electromechanics

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Reluctance machines Force originates from change of inductance Even more straightforward than affectation Again, harder to use in stand-alone conditions Position synchronization required Grainger Center for Electric Machinery and Electromechanics

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Permanent magnet machines Force happens because of connections of momentum on stationary part with magnets on rotating part Relatively high cost, however a dynamic examination range Most direct to use for stand-alone electric era Position synchronization might be required Grainger Center for Electric Machinery and Electromechanics

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Design Methods New machine topologies requests new plan strategies take specs from biomechanical information Can\'t utilize \'treat cutter\' methodology Finite components? 3-D likely. Attractive comparable circuits? Grainger Center for Electric Machinery and Electromechanics

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Construction and Testing Not direct to manufacture custom methodologies Testing torque and pace with dynamometer is not likely couple of watts torque and pace not all that consistent irregular movements, substantial varieties between human generators Develop benchmarks particular to biomechanics Grainger Center for Electric Machinery and Electromechanics

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Challenges in Power Electronics Energy source is flighty instability variable recurrence, signal level current source if electrostatic generator Low power at most, 10\'s of watts at low end, mW Low flag level, potentially Switch drops equivalent to voltage levels Control and power for control circuit Grainger Center for Electric Machinery and Electromechanics

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Fine\' - Other Caveats Can biomechanical vitality change enhance human experience? cause heel strike to have less negative effect lessen the weight of steady carnival of reviving batteries Can the transformation be valuable in motoring and in addition producing? help physically crippled people execution supporter for competitors, military Grainger Center for Electric Machinery and Electromechanics

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