Investigation upon the performance of piezoelectric energy harvester with elastic extensions

Abstract

Piezoelectric vibration energy harvesters have attracted much attention due to its potential to replace currently popular batteries and to provide an sustainable power sources. Many researchers have proposed ways to increase the performance of piezoelectric energy harvesters like bandwidth, working frequency and output performance. Here in this contribution, we propose the method of using elastic extensions to tune the performance of a piezoelectric energy harvester. Mathematical model of the proposed device is derived and analyzed. Numerical simulations are done to investigate the influences of the derived parameters, like length ratio λ l , bending stiffness ratio λ B , and line density ratio λ m . Results show that the elastic extension does change the motion of the proposed device and help tune the performance of piezoelectric energy harvesters.

Energy stacking efficiency of a novel low-frequency spring-like piezoelectric energy harvester

“…To reduce the natural frequency of PEH, the system's structure is typically modified. For example, embedding an elastic proof mass in the cantilever beam [14], conducting a softer substrate for the transducer [15], or connecting the PEH system with an extra spring [16]. In 2018, Wu et al proposed a multidirectional PEH with 13.29 mW at 2.03 Hz for ultra-low-frequency vibration energy harvesting.…”