Improvement Effectivness of the Tri-stable Energy Harvesting System by Adapting Potential Energy

This paper presents the process optimization of some key parameters, such as the size of the air gap and distance between fixed neodymium magnets to enhance the vibration-based energy harvesting effect in the tri-stable energy harvesting systems and the improved tri-stable energy harvesting system being the proposed solution under weak excitation. In order to do it, firstly the distributed parameters model of the magnetic coupling EH system, including macro fiber composites of type 8514 P2 with a homogenous material in the piezoelectric fiber was determined. The performed numerical analysis of the conventional and the improved TPEH system indicated that introducing an additional magnet to the classical tri-stable system leads to the shallowing of the depth of a potential well by decreasing the air gap between magnets and consequently improving the effectiveness of the proposed ITPEH system. Experiments carried out on the laboratory stand allowed us to verify the obtained results as well as determine the optimal parameters of the magnetic coupling system by which the effectiveness of the ITPEH is most enhanced.