Fig. 1. Schematic of oval-shaped piezoelectric harvester.
Fig. 2. Base excitation of mass-spring-damper system.
Fig. 4. Applied force in half oval-shaped piezoelectric energy harvester.
Fig. 3. Equivalent circuit model of piezoelectric energy harvester.
Fig. 5. Experimental setup of oval-shaped piezoelectric energy harvester; (a) Front view of experimental setup, (b) Acceleration measurement, (c) Impedance matching, (d) Output characteristic measurement.
Fig. 6. Open circuit voltage versus vibration frequency of ovalshaped piezoelectric energy harvester; (a) Measured value, (b) Simulated value.
Fig. 8. Open circuit voltage versus vibration frequency of ovalshaped and cantilever piezoelectric harvesters; (a) Measured value, (b) Simulated value.
Fig. 9. Maximum output power comparison; (a) Measured value comparison, (b) Simulated value comparison.
Fig. 7. (a) Simulated output power versus load resistance of ovalshaped piezoelectric energy harvester, (b) Comparison of measured and simulated maximum output power.
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