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Vol. 17, Special Issue, December 2012, pp. 176-185

 

Selected papers from the 4th International Conference on Intelligent & Advanced Systems (ICIAS' 2012),

12-14 June 2012, Malaysia, Kuala Lumpur

 

Bullet

 

Analytical Investigation of Frequency Dependence of Average Power of a Vibration Energy Harvester
 

1 K. Ashraf, 1 M. H. Md. Khir, 2 J. O. Dennis

1 Department of Electrical and Electronics Engineering,

2 Department of Fundamental and Applied Sciences,

Universiti Teknologi PETRONAS (UTP), Bandar Seri Iskandar¸ Tronoh, Perak, 31750, Malaysia

E-mail: ka_balghari@yahoo.com

 

 

Received: 29 September 2012   /Accepted: 29 October 2012   /Published: 18 December 2012

Digital Sensors and Sensor Sysstems

 

Abstract: Realization of self powered wireless sensor network has become possible with the recent development in energy harvesting and micromachining techniques. The versatility of vibration energy makes it the most attractive power source for wireless sensors. In several environments, vibration energy is distributed in few harmonics. To effectively scavenge ambient energy, one has to choose the harmonic to which the harvester should be tuned. This paper analytically investigates dependence of the average power of a vibration energy harvester on the frequency of vibration. It is shown that the cubic dependence of the average power on the frequency of vibration holds only when the electromechanical coupling can be increased with the frequency. For a constant electromechanical coupling, the power increases with the fourth power of the driving frequency. When the magnitude of the base acceleration is constant, a high frequency harmonic will give more average power density than a low frequency one.

 

Keywords: Energy harvesting, Energy scavenging, Analytical analysis, Power MEMS, Wireless sensor network

 

 

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