Investigation of Piezoelectric Energy Harvesting via Nonlinear Friction-Induced Vibration

Figure 12

The displacement versus velocity phase trajectory of the friction system in tangential direction (a) and normal direction (b). The velocity versus voltage trajectory of the friction system in tangential direction (c) and normal direction (d) when μ_k = 0.7 and μ_s = 0.9.

(a)

(b)

(c)

(d)