Nonlinear Dynamics and Power Generation on a New Bistable Piezoelectric-Electromagnetic Energy Harvester

Table 1

Comparison of the power generation efficiency of the structure A, the structure B, and the structure C is given when the external excitation frequency is studied.

Magnetic distance (mm)	Structure	(Hz)	(V)
—	A	4	12.337	—	—
16	B	4.4	10.127	13.8	9.14
	C	5.4	11.521
15	B	5.8	15.214	6.71	10.11
	C	6.8	15.806
14	B	5.8	14.882	3.47	7.81
	C	7.2	15.399
13	B	6.2	12.478	10.44	19.24
	C	7.0	13.781
12	B	4	6.634	7.21	4.14
	C	4.2	7.112
11	B	1.6	4.26	13.8	8.21
	C	1.8	4.85

A is the conventional monostable piezoelectric cantilever beam; B indicates the bistable piezoelectric cantilever beam with the spring and the magnet; C indicates the bistable piezoelectric cantilever beam with the spring, the magnet, and the coil. indicates the effective frequency bandwidth of structures; indicates the maximum output voltage; indicates the growth rate of the maximum output voltage; indicates the average growth rate of the output voltage.