Tunable bistable devices for harvesting energy from spinning wheels

Mohamed Elhadidi; Mohammed Helal; Omar Nassar; Mustafa Arafa; Yasser Zeyada

doi:10.1117/12.2083669

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2 April 2015 Tunable bistable devices for harvesting energy from spinning wheels

Mohamed Elhadidi, Mohammed Helal, Omar Nassar, Mustafa Arafa, Yasser Zeyada

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Proceedings Volume 9431, Active and Passive Smart Structures and Integrated Systems 2015; 94310S (2015) https://doi.org/10.1117/12.2083669
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2015, San Diego, California, United States

Abstract

Bistable systems have recently been employed for vibration energy harvesting owing to their favorable dynamic characteristics and desirable response for wideband excitation. In this paper, we investigate the use of bistable harvesters to extract energy from spinning wheels. The proposed harvester consists of a piezoelectric cantilever beam that is mounted on a rigid spinning hub and carries a tip mass in the form of a permanent magnet. Magnetic repulsion forces from an opposite magnet cause the beam to possess two stable equilibrium positions. Inter-well lead-lag oscillations caused by rotation in a vertical plane provide a good source for energy extraction. The design offers frequency tuning, as the centrifugal forces strain the harvester, thereby increasing its natural frequency to cope with a variable rotational speed. This has applications in self-powered sensors mounted on spinning wheels, such as tire pressure monitoring sensors. An effort is made to select the design parameters to enable the harvester to exhibit favorable inter-well oscillations across a range of rotational speeds for enhanced energy harvesting. Findings of the present work are verified both numerically and experimentally.

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Mohamed Elhadidi, Mohammed Helal, Omar Nassar, Mustafa Arafa, and Yasser Zeyada "Tunable bistable devices for harvesting energy from spinning wheels", Proc. SPIE 9431, Active and Passive Smart Structures and Integrated Systems 2015, 94310S (2 April 2015); https://doi.org/10.1117/12.2083669

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