Comparative Analysis of Monostable and Bistable Energy Harvester working under Vortex Induced Vibrations (VIV)

Abstract

An efficient, eco-friendly energy generation approach has increased the potential development of harvesting wind energy via a piezoelectric transduction mechanism, which can be a feasible replacement for conventional batteries in low-powered, portable, and wireless appliances and gadgets. Different phenomena harvest vibrational energy using wind, such as vortex-induced vibrations (VIV), wakegalloping, galloping, and flutter. These are dependent upon the form of the bluff body to be employed. Magnetic force enhances the performance of the energy harvester by non-linearity in the system as it will switch between mono-stable regions and bi-stable regions due to non-linear magnetic force; hence, there is a need to study this aspect. In this study, we compare the mono-stable variant and bi-stable variant of the piezo-aeroelastic energy harvester. The addition of base excitation to the system allows for additional research. Buckling is influenced by the non-linear force induced by a pair of magnets, which varies with their distance from one another. The efficiency analysis of both mono-stable regions and bi-stable regions is carried out on the magnetic separation at the equivalent coupled frequency for an accurate and effective comparison. The Euler-Lagrange technique has been used to develop a lumped parameter model. Non-linear magnetic force is shown in the equation by dipole dipole representation. The static frequency analysis and coupled frequency analysis are done using the mathematical model, after which a performance analysis is performed. The performance analysis is done by simulation using MATLAB. The study shows that bi-stability helps achieve broadband synchronization regions.