TITLE:
Design Methodology of a Micro-Scale 2-DOF Energy Harvesting Device for Low Frequency and Wide Bandwidth
AUTHORS:
Mahmoud M. Magdy, Ahmed M. R. Fath El-Bab, Samy F. M. Assal
KEYWORDS:
Energy Harvesting, Two Degree of Freedom, Low Frequency, Wide Bandwidth
JOURNAL NAME:
Journal of Sensor Technology,
Vol.4 No.2,
April
15,
2014
ABSTRACT: A detailed design methodology of a micro-scale 2-DOF energy harvesting device that can harvest human motion energy of low frequency and wide bandwidth is developed. Based on the concept of the 2-DOF vibration absorber, device parameters are selected to harvest energy at low frequency of 1-10 Hz and wide bandwidth with ±20% of the mean frequency, which matches the human motion. The device dimensions are limited to 40 × 30 × 10 mm3 to fit with the human wrist size. Then, a finite element model is developed to investigate the system performance with the selected parameters. When subjected to harmonic excitation of 1 g, the proposed 2-DOF device is able to provide a power of at least 10 μW in between the two close resonant peaks of 4 Hz and 6 Hz, which is the target frequency range. The device shows very high power per square frequency compared with the reported harvesters.