Auxetic structure for increased power output of strain vibration energy harvester (dataset)
Ferguson, William J.G.
Evans, Kenneth E.
Smith, Christopher W.
Sensors and Actuators A: Physical
University of Exeter
CC BY-NC-ND 4.0
This paper develops an auxetic (negative Poisson’s ratio) piezoelectric energy harvester (APEH) to increase the power output when harnessing strain energy. The APEH consists of a piezoelectric element bonded to an auxetic substrate. The auxetic substrate concentrates the stress and strain into the piezoelectric element’s region and introduces auxetic behaviour in the piezoelectric element, both of which increase the electric power output. A finite element model was developed to optimise the design and verify the mechanism of the power increase. Three APEHs were manufactured and characterised. Their performance was compared with two equivalent strain energy harvesters with plain substrates. Experimental results show that the APEHs, excited by sinusoidal strains peak to-peak of 250 με at 10 Hz, are able to produce electric power of up to 191.1 µW, which is 14.4 times of the peak power produced by the plain harvesters (13.4 µW). The power gain factor is constant between samples as the amplitude and frequency of their applied strains are varied. The model and experimental results are in good agreement, once accounting for the imperfect bonding of the epoxy using the spring constant of the Thin Elastic Layers on the modelled epoxy surfaces.
We acknowledge financial support from the Engineering and Physical Sciences Research Council (EPSRC) of the United Kingdom, via the EPSRC Centre for Doctoral Training in Metamaterials (Grant No. EP/L015331/1)
This is the dataset used for the Ferguson et al. (2018) article "Auxetic structure for increased power output of strain vibration energy harvester".
Model results (reqires COMSOL 5.3 or up) and experiemental raw data, as well as the MATLAB code used to process it.
The article associated with this dataset is located in ORE at: http://hdl.handle.net/10871/33999