Nonlinear Modeling and Analysis of a Vertical Springless Energy Harvester
University of Waterloo, 200 University Avenue, Waterloo, Ontario, Canada
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Harvesting energy from ambient sources has attracted the attention of researchers and scientists over the last few decades. While solar, thermal and wind energies have been exploited over the years, a new type of energy that has emerged in recent years, and is the subject of many research projects, is vibration energy harvesting. In this paper we will describe and analyze a recently proposed vibration energy harvester, namely the “Springless” vibration energy harvester. In this study, we will model and analyze the “Springless” vibration energy harvester in the vertical configuration. The vertically-aligned configuration is used when vibrations are predominantly in the vertical direction. Test results of a prototype model as well as results form a mathematical model describing the behavior of the harvester are presented. Test results show that the “Springless” energy vibration harvester behaves as a softening nonlinear oscillator for excitations above 0:2g with its center frequency shifting to the right. Similar results were obtained using a mathematical model of the underlying impact oscillator.
© Owned by the authors, published by EDP Sciences, 2012