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Vol. 13, Special Issue, December 2011, pp.62-72

 

Bullet

 

Increased Bandwidth of Mechanical Energy Harvester

 

 * B. Ahmed Seddik, G. Despessse, S. Boisseau, E. Defay

CEA-LETI/MINATEC-Campus

17 rue des Martyrs, 38054 Grenoble, France

Tel.: +33(0)438780483

E-mail: ahmedseddik9@yahoo.fr

 

 

Received: 29 June 2011   /Accepted: 16 November 2011   /Published: 28 December 2011

Handbook of Laboaratory Measurements book

 

Abstract: This paper presents a new approach for enlarging the relative movement of a base excited cantilevered system at off-resonance. The aim is to broaden the peak resonance of resonators without compromising the quality factor. The idea is to gather the resonance phenomenon conditions at off resonance. We do so by using a rebound system to block the seismic mass of the cantilever with support of vibration, when the speed of this one is maximum. The present study shows that using this technique will amplify the movement of the seismic mass and hence, the transferred mechanical energy from the source to the cantilever. This approach is useful for vibration harvesters operating in environments presenting a variable frequency or even for random vibrations. In this work we detail the approach; we also show how to optimize the efficiency of the present structure. Finally we present the experimental results that validate the approach. We show that a gain six times greater than simple resonator was obtained over more than one octave.

 

Keywords: Energy harvesting, Resonators, Wideband resonators, Ambient vibration, Frequency tuning

 

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