Experimental Analysis of Multiple Modes and Nonlinear Behavior in Electromagnetic Type Vibration Energy Harvesters

Iftikhar Ahmad ； Farid Ullah Khan

《中國機械工程學刊》 39卷5期 (2018/10) Pp. 509-514

摘要

Experimental analysis of multiple modes and nonlinear behavior in electromagnetic type vibration energy harvester (EV-EH) has been investigated in this paper. The EV-EH fabricated in this research is composed of planar movable coils (PMC) which is fabricated from printed circuit board sheet using Computer Numerical Control milling machine, neodymium (NdFeB) magnets residing on latex membrane and acrylic spacers. The EV-EH can harvest energy from multi modes sinusoidal and random vibrations. The multiple modes of the prototype have been found using various techniques like Fast Fourier Transform (FFT) and Power Spectral Density (PSD). The developed prototype has three resonant frequencies at 60 Hz, 139 Hz and 278 Hz. The nonlinear behavior of the EV-EH has also been discussed in this paper using bifurcation diagrams. At higher acceleration level, the resonant frequencies of EV-EH are shifting from those at low acceleration level. At different acceleration level, the EV-EH shows sharp jump and sharp fall phenomenon which is due to the nonlinear behavior of the device. The EV-EH is also able to generate a 12 mV open circuit voltage at 3 g acceleration level.

關鍵字

Energy harvesting ； Electromagnetic ； Multiple modes ； Nonlinear behavior ； Planar movable coil