The influence of mass configurations on bandwidth in velocity amplified Vibrational energy harvesters

Declan O'Donoghue, Ronan Frizzell, Jeff Punch

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Vibrational energy harvesters offer an alternative to batteries for the autonomous powering of low power electronic devices, such as wireless sensors. Velocity amplified electromagnetic generators (VAEGs) utilise the velocity amplification effect in order to increase the output power and operational bandwidth of an electromagnetic generator, compared to linear resonators. This effect is achieved through sequential collisions in a system of free-moving masses. The velocity amplification achieved is controlled by the number of masses or degrees-of-freedom (dofs) and the mass ratio between them. An experimental investigation into the influence of mass ratio and number of dofs on the operational bandwidth of a VAEG at low frequencies (< 30 Hz) is presented herein. VAEG systems with 2-, 3-and 4-dofs are analysed for mass ratios in the range of 3:1 to 20:1 under sinusoidal forced excitation. It is shown that 3-and 4-dof configurations offer broader bandwidths than 2-dof configurations, particularly at higher mass ratios. At lower mass ratios, the bandwidths of the 3-and 4-dof configurations decrease, while the bandwidth of the 2-dof configuration increases. At a mass ratio of 3:1, the bandwidth of the 2-dof configuration approaches that of the 3-and 4-dof configurations. The highest half-power bandwidth of 9.3 Hz was achieved by the 3-dof mass ratio 20:1 system, at an acceleration of 1 g. The total voltage harvested over the frequency range 7-30 Hz is at a maximum at a mass ratio of 5:1 for the 3-and 4-dof configurations, and at 3:1 for the 2-dof configuration. The findings of this investigation will be significant in the development of future reduced scale VAEGs.

Original languageEnglish
Title of host publicationIntegrated System Design and Implementation; Structural Health Monitoring; Bioinspired Smart Materials and Systems; Energy Harvesting
PublisherAmerican Society of Mechanical Engineers
ISBN (Electronic)9780791857304
DOIs
Publication statusPublished - 2015
EventASME 2015 Conference on Smart Materials, Adaptive Structures and Intelligent Systems, SMASIS 2015 - Colorado Springs, United States
Duration: 21 Sep 201523 Sep 2015

Publication series

NameASME 2015 Conference on Smart Materials, Adaptive Structures and Intelligent Systems, SMASIS 2015
Volume2

Conference

ConferenceASME 2015 Conference on Smart Materials, Adaptive Structures and Intelligent Systems, SMASIS 2015
Country/TerritoryUnited States
CityColorado Springs
Period21/09/1523/09/15

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