Modeling and Analysis of a Random Excited Double-Clamped Piezoelectric Energy Harvester

A double-clamped piezoelectric energy harvester subjected to random excitation is presented, for which corresponding analytical model is established to predict its output characteristics. With the presented theoretical natural frequency and equivalent stiffness of vibrator, the closed-form expressions of mean power and voltage acquired from the double-clamped piezoelectric energy harvester under random excitation are derived. Finally theoretical analysis is conducted for the output performance of the double-clamped energy harvester with the change of spectrum density (SD) of acceleration, load resistance, piezoelectric coefficient and natural frequency value, which is found to closely agree with Monte Carlo simulation and experimental results.