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Eelectric Energy Harvesting Through Piezoelectric Polymers Progress Report - April 8

Eelectric Energy Harvesting Through Piezoelectric Polymers Progress Report - April 8. Don Jenket, II Kathy Li Peter Stone. Presentation Overview. Brief Review of Progress Quantitative Analysis of Materials Processing and Design Changes Problems Encountered Future Design Revisions

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Eelectric Energy Harvesting Through Piezoelectric Polymers Progress Report - April 8

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  1. EelectricEnergy Harvesting Through Piezoelectric PolymersProgress Report - April 8 Don Jenket, II Kathy Li Peter Stone

  2. Presentation Overview • Brief Review of Progress • Quantitative Analysis of Materials • Processing and Design Changes • Problems Encountered • Future Design Revisions • Revised Timeline Eelectric

  3. Objective • DARPA Objective: Convert mechanical energy from a fluid medium into electrical energy. • Fluid flow creates oscillations in an eel body • Creates strain energy that is converted to AC electrical output by piezoelectric polymers • AC output is stored and/or utilized • 3.082 Objective: Harness enough power from air flow to operate a L.E.D. http://www.darpa.mil/dso/trans/energy/pa_opt.html Eelectric

  4. Piezoelectric Response in Air Flow 2cm x 10cm Piezoelectric PVDF Eelectric

  5. PZT Composite Tail http://web.media.mit.edu/~testarne/TR328/node7.html Eelectric

  6. PZT Composite Response in Air Flow PZT Eelectric

  7. Estimation of Piezoelectric Response • If we model the tail as a cantilever: V = 3/8 * (t/L)2 * h31 * dz, t= thickness; L = Length; dz = bending radius and h31 = g31*(c11 + c12)+ g33*c13 g31 = 0.011[V*m/N] c11 = 37 GN*m-2 L = 15 cm g33 = 0.025 [V*m/N] c12 = 23.1 GN*m-2 t = 200 mm dz = 2 mm c13 = 23.1 GN*m-2 Equation taken from: Herbert, J.M., Moulson, A.J. Electroceramics: Materials, Properties, Applications. Chapman and Hall: London, 1990. Eelectric

  8. Comparison of Predictions 1: Takes into account actual area occupied by piezoelectric material. PVDF is pure so this value is 1 times the voltage. PZT covers approximately 30 percent of the composite so its voltage is multiplied by 0.3 Eelectric

  9. “Eel Tail” Schematic II 9.5 cm Tail End 2.5 cm 3.5 cm Head End 2 cm Gold Electrode Top View Cu Wire Gold Electrode Cu Wire Cu Wire 0.04 mm Silver paste 9.5 cm 2 cm Side View Front View Eelectric

  10. Processing & Design Changes • Wires • Old: 3 mil uninsulated copper • New: 5 mil insulated magnet wire • Au electrode placement • Old: 2.5 & 3.5 cm sections • New: 2.5 & 5 cm sections • Au electrode sputtering • Old : Ti Sputtering • New Method: Au Sputtering Eelectric

  11. Sputtering Apparatus Sample Chamber Pelco SC-5, Automatic High Resolution Sputter Coater Eelectric

  12. Sputtering Target Sample Chamber Sample Sputtering Au Eelectric

  13. Problems Encountered • Uncontrolled Wires • Generates noise during measurements • Can lead to accidents… • Durability • Sample severely damaged immediately before oscilloscope testing • Poor adhesion between polymer layers • Silver paste weakens with time -> Sample falls apart • Loss on connectivity between wires and electrodes Eelectric

  14. Future Revisions • Strain Relief of Wires • Reinforce Silver Paste with tape • Offset Polymer Layers • Allows for easier weaving and/or adhesion of wire to polymer Eelectric

  15. Revised Timeline Eelectric

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