Enhanced Energy Conversion Efficiency through Coupling of Potentials on Non-linear Vibrational Energy Harvesters: Identification via Root-Tracking Technique and Energy Eye-Diagrams

This work reports on the design and characterization of electromagnetically transduced non-linear vibrational energy harvesters to study the interplay between non-linear potential energies, namely, monostable/quartic potential and bistable potential. We propose a dynamic root-tracking technique to reveal the signature of coupling in non-linear energy profiles. With the use of normalized power integral density (NPID) metric and energy eye-diagrams, we validate the efficacy of the system with coupled energy profile, which demonstrates maximum efficiency of 64% as compared to 46% for its monostable counterpart.