Mahmoud M. Magdy^*, Ahmed M. R. Fath El-Bab^*, Samy F. M. Assal^*

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Mechatronics and Robotics Engineering Department, Egypt-Japan University of Science and Technology, Alexandria, Egypt.
Mechatronics and Robotics Engineering Department, Egypt-Japan University of Science and Technology, Alexandria, Egypt;Mechanical Engineering Department, Faculty of Engineering, Assiut University, Assiut, Egypt.
Mechatronics and Robotics Engineering Department, Egypt-Japan University of Science and Technology, Alexandria, Egypt; Production Engineering and Mechanical Design Department, Faculty of Engineering, Tanta University, Tanta, Egypt.
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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.

Keywords: Energy Harvesting, Two Degree of Freedom, Low Frequency, Wide Bandwidth

Cite this paper: Magdy, M. , El-Bab, A. and Assal, S. (2014) Design Methodology of a Micro-Scale 2-DOF Energy Harvesting Device for Low Frequency and Wide Bandwidth. Journal of Sensor Technology, 4, 37-47. doi: 10.4236/jst.2014.42005.

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