This study proposes that elastic bases attached to vibration generators can lower natural frequencies, so as to make natural frequencies closer to ambient vibration frequency.
In the field of piezoelectric energy harvesting from ambient low-frequency vibrations, frequency up-converting effect is a classical approach to improve the efficiencies of energy conversion and extraction.
This design's resonant frequencies at its first three mode shapes are within the low ambient vibration frequency range.
These oscillators are usually designed to be resonantly tuned to the ambient dominant frequency.
Traditional energy harvesters are often of low efficiency due to very limited energy harvesting bandwidth, which should also be enough close to the ambient excitation frequency.
Energy harvesting from ambient radio frequency waves has the potential for realizing long lived wireless sensor networks, by reducing their dependence on the limited and irreplaceable on-board batteries.
Using this technology, the battery-powered wireless communication devices can harvest energy from the ambient radio frequency (RF) signals to prolong their lifetime.
In recent years, simultaneous information and power transfer (SWIPT) has become a promising technology, which allows a wireless equipment to perform energy harvesting (EH) and information processing at the same time by using the ambient radio frequency signals [1 6].
The harvester features two vibrational degrees-of-freedom (DOFs) corresponding to the two cantilevers: The primary DOF picks up the ambient low-frequency vibrations and excites the secondary one to vibrate drastically at its resonant frequency.
