Vibration energy harvesting
The conversion of ambient energy, present in the environment, mainly “ambient vibration”, into electrical energy. The main interest in the technology derives from its capability to act as an independent power supply for wireless self-powered microsystems, as an alternative to the use of batteries. Vibration energy harvesting is particularly well suited to industrial condition monitoring applications where sensors may be implemented in inaccessible environment (in harsh, dark or dirty environments).
Dual frequency resonator
Most vibration-based micro-generators generate maximum power when the resonance frequency of the generator coincides with the ambient vibration’s frequency. Any deviation results in a significant decrease in output power. This constitutes a fundamental limitation of current vibration energy harvesters. We focus our research activities towards new energy harvester designs, which are able to tune their resonance frequency or provide extended bandwidth.
- S. Bouhedma, Y. Zheng, D. Hohlfeld, “Multiphysics modeling and simulation of a dual frequency energy harvester”, accepted for publication in Proc. European Conference on Modelling and Simulation, May 2018.
- S. Bouhedma, Y. Zheng, H. Hartwig, D. Hohlfeld, "Magnetic resonance frequency tuning of energy harvester with multiple operating frequencies", GMM-Workshop Energieautarke Sensorik, March 2018.
- S. Bouhedma, D. Hohlfeld, “Frequency tunable energy harvester with segmented piezoelectric patches for improved power generation”, Proc. Mikrosystemtechnik-Kongress, October 2017, pp. 456-459.
- D. Hoffmann, S. Bouhedma, T. Bechtold, D. Hohlfeld, “Entwurfsverfahren für piezoelektrische Energiewandler mit mehreren inhärenten Betriebsfrequenzen”, GMM-Workshop Energieautarke Sensorik, February 2016.