A 2 DOF vibration harvester for broadband and multifrequency harvesting using a single electro-magnetic transducer

14th International Conference on Micro and Nanotechnology for Power Generation and Energy Conversion Applications

物理学;能源学

Burrow, S.G.^1 ; Penrose, L.^1

University of Bristol, Bristol, United Kingdom^1

关键词: 2 degree of freedoms;    Electrical parameter;    Electromagnetic transducer;    Excitation frequency;    Frequency response functions;    Higher-order systems;    Magnetic transducers;    Single degree of freedoms;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/557/1/012031/pdf
DOI  :  10.1088/1742-6596/557/1/012031

来源: IOP

【 摘 要 】

The narrow bandwidth of resonant vibration energy harvesters has long been seen as a drawback to exploitation. The narrow bandwidth is necessitated by the requirement to sufficiently amplify small source vibrations, but results in devices vulnerable to changes in excitation frequency, de-tuning due to ageing of components, and also makes efficient harvesting from sources with multiple frequency components difficult. In this paper a harvester based on a 2 degree of freedom oscillator is presented that not only enjoys the wider bandwidth of the higher order system, but configures the electromagnetic transducer in such a way that it requires no more components than the transducer of a typical single degree of freedom harvester. Theoretical models of the harvester system predict a range of possible frequency response functions dependent on easily-adjusted electrical parameters. These predictions are validated with experimental results.