A Combined Softening and Hardening Mechanism for Low Frequency Human Motion Energy Harvesting Application

Figure 2

Time history ((a), (c), (e), (g)) and harmonics ((b), (d), (f), (h)) of human motion resulting from walking at 5 km/h. Vibration recorder was placed at the head ((a), (b)), leg ((c), (d)), waist ((e), (f)), and wrist ((g), (h)).

(a)

(b)

(c)

(d)

(e)

(f)

(g)

(h)