Biomedical Engineering Reference
In-Depth Information
Fig. 5. ANN used to model the average power and peak-to-peak voltage of the PEH generator
Fig. 6. Experimental (dotted line) and simulated (dashed line) average (in the left) and maximum
(in the right) power harvested from the TEEH transducer
4.1
TEEH Results
A load resistance of 979 Ω was used to enable the energy transfer when sinusoidal
input vibrations, with amplitudes in the range 10 mm to 40 mm and frequencies in
the range 0 . 5 Hz to 4 Hz, were applied to this generator. Figure 6 shows the results of
the experimental and simulated average and maximum power, whereas Fig. 7 highlights
the results of the experimental and simulated energy and peak-to-peak voltage. Tables
1 to 4 report the modulation errors. The maximum energy harvested was 53 . 7 μ J/s
when the sinusoidal function has an amplitude of 40 mm and a frequency of 4 Hz. This
harvester is able to provide 567 . 4 μ W of instantaneous peak power when the input is
excited with an amplitude of 40 mm and a frequency of 3 Hz.
4.2
REEH Results
A load resistance of 8 . 98 k Ω was used to enable energy transfer of this generator when
sinusoidal rotations in the flexion-extension axis, with amplitudes in the range 50 to
70 and frequencies in the range 0 . 5 Hz to 2 . 5 Hz, were applied to the generator. Using
the magnetic field in the winding measured at the ends of the winding ( 80 mT), the
experimental and simulated results are reported in Fig. 8 and Fig. 9. Tables 5 to 8 report
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