Vibration energy harvesting from multi-directional motion sources

Conference Paper (2018)
Authors

T.W.A. Blad (TU Delft - Mechatronic Systems Design)

Davood Farhadi Farhadi (TU Delft - Mechatronic Systems Design)

J. L. Herder (TU Delft - Precision and Microsystems Engineering, TU Delft - Mechatronic Systems Design)

A.S. Holmes

N Tolou (TU Delft - Mechatronic Systems Design)

Research Group
Mechatronic Systems Design
To reference this document use:
https://doi.org/10.1109/MARSS.2018.8481178
More Info
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Publication Year
2018
Language
English
Research Group
Mechatronic Systems Design
ISBN (print)
978-1-5386-4842-1
ISBN (electronic)
978-1-5386-4841-4
DOI:
https://doi.org/10.1109/MARSS.2018.8481178

Abstract

Vibration energy harvesting can be used as a sustainable power source for various applications. Usually, the generators are designed as devices with a single degree of freedom (SDoF) along the direction of the driving motion. In this research, harvesting from multi-directional (translational) motion sources will be investigated. Three strategies are assessed: a reference SDoF generator, a SDoF generator using an orientation strategy, and a Multi Degree of Freedom (MDoF) system. This led to the development of a design metric by which any 2D design problem can be described by two dimensionless parameters: the relative strength of vibrations, pv, and the relative dimension of the design space, pl. It was shown that the relative power density (RPD) of a 2DoF system compared to a reference SDoF system only depends on the product p=pvpl, and has a maximum of 1.185 for p=1. The application of powering a hearing aid is investigated as a case study. It was found that the vibrations in the area of the human head while walking can be represented by a two-directional vibration source with pv=0.55. Three different design spaces are assessed for a miniaturized generator and three different optimal embodiments are found. For one of the considered situations where p=1.1, a 2DoF system was found to have a 16% higher power output compared to a SDoF reference. The aim of future work will be the validation of the developed metric.

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