Investigation of Multifrequency Piezoelectric Energy Harvester

Figure 15

Energy density characteristics of the harvester at resonant frequencies: at (a) 15.11 Hz; (b) 50.1 Hz; (c) 159.72 Hz; (d) 207.4 Hz; (e) 314.4 Hz.

(a)

(b)

(c)

(d)

(e)