Investigation of Piezoelectric Energy Harvesting via Nonlinear Friction-Induced Vibration

Figure 13

The tangential displacement (a), normal displacement (b), tangential voltage (c), normal voltage (d), and contact force (e) of the friction system in the time domain when μ_k = 1 and μ_s = 1.2.

(a)

(b)

(c)

(d)

(e)