Impulsive energy conversion with magnetically coupled nonlinear energy harvesting systems

Abstract

Magnets have received broad attention for vibration energy harvesting due to noncontact, nonlinear forces that may be leveraged among harvesting system elements. Yet, opportunities to integrate multi-directional coupling among a nonlinear energy harvesting system subjected to impulsive excitations have not been scrutinized, despite widespread prevalence of such excitations. To characterize these potentials, this research investigates an energy harvesting system with magnetically induced nonlinearities and coupling effects under impulsive excitations. A system model is formulated and validated with experimental efforts to reconstruct static and dynamic properties of the system via simulations. Then, the model is harnessed to scrutinize dynamic response of the system when subjected to impulse conditions. This research reveals the clear impulse strength dependence and influence of asymmetries on total electrical energy capture and energy conversion efficiency that are tailored by magnetic force coupling. Asymmetry is found to promote greater impulse-to-electrical energy conversion when compared to the symmetric counterpart system and a benchmark nonlinear energy harvester. The roles of initial conditions exemplify how stored energy in an asymmetric energy harvesting system may be released during nonlinear impulsive response. These results provide insights about opportunities and challenges to incorporate magnetic coupling effects in nonlinear energy harvesting systems subjected to impulses.

A machine learning approach for maximizing direct current power of nonlinear energy harvesting systems subjected to periodic impulse excitation

“…A piezoelectric beam with additional magnetic potentials is frequently employed to construct a post-buckled energy harvesting system due to the ease of assembly and tuning [10]. Fig.…”

“…For the clamped beam shown in Fig. 1(a), the magnetic force acting on the magnet 1 along the transverse x direction is computed to be [10]…”

Power enhancement of a monostable energy harvester by orbit jumps

“… r 1 = 3.06 mm and r 2 = 10.41 mm are internal and external radii of the coil. Similar to the nonlinear force by the magnet pairs, the electromagnetic force between the beam end magnet and the bar magnet can be obtained through the dipole-dipole model (Dai et al, 2018). The repulsive force further increases nonlinearity in the monostable system.…”

Study of a magnetic SMA-based energy harvester using a corrugated structure

“…Askari Farsangi et al (2017) also reported the experimental results for attachment of an MSMA element to an inertial vibrating structure in order to harvest vibrational energy. In another work, Dai et al (2018) investigated an energy harvesting system with magnetically induced nonlinearities and coupling effects under impulsive excitations.…”