On the Nonlinear Behavior of the Piezoelectric Coupling on Vibration-Based Energy Harvesters

Figure 4

Results of voltage versus the electrical resistive load at different (a) 95 Hz, (b) 109.5 Hz (resonance frequency), (c) 135 Hz, and (d) 160 Hz. Experimental data (scatter), LM (scatter line), NLM-L (dashed line), and NLM-Q (solid line) models.

(a)

(b)

(c)

(d)