Experimental Analysis of a Piezoelectric Energy Harvesting System for Harmonic, Random, and Sine on Random Vibration

Table 1

System parameters.

Symbol	Representation	Value	Unit
𝑓𝑛	Natural frequency	58.3^l; 124.5^h	Hz
𝑓𝑎	Antiresonant frequency	60.1^l; 127.5^h	Hz
𝑀	Modal mass	9.5^l; 1.1^h	g
𝑄	Quality factor	60^l; 120^h	—
𝛼	Force factor	4.8∗10^−3	N V^−1
𝜅𝑝	Electromechanical coupling factor	0.92	%
𝐶𝑝	Clamped capacitance	130	nf
𝐶𝑟	Load capacitance	600	μf

The superscripts ^l, standing for low, and ^h, standing for high, represent the corresponding values for the frequencies near the lower and upper bounds of tunable range, 58.3 Hz and 124.5 Hz, respectively.