Reversible hysteresis for broadband magnetopiezoelastic energy harvesting

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Improving functionality of vibration energy harvesters using magnets (2012, background): “Stanton et al. (2009) proposed a monostable harvester in which both the hardening and softening responses could occur by tuning the magnetic interactions.”
M-shaped asymmetric nonlinear oscillator for broadband vibration energy harvesting: Harmonic balance analysis and experimental validation (2014, background): “Other than magnetoelastic interactions [30,34–36,38,39], purely elastic buckling was also considered for bandwidth and performance enhancement in energy harvesting [40–42].”
Rotational energy harvesting using bi-stability and frequency up-conversion for low-power sensing applications: Theoretical modelling and experimental validation (2019, background): “These modes can be achieved by applying tensile or compressive pre-loads in the axial direction of cantilever structures [20] to extend the operating frequency bandwidth close to the resonant frequency of its linear counterpart.”
Broadband tristable energy harvester: Modeling and experiment verification (2014, background): “As a result, the intensive investigation of vibration energy harvesters with monostable [15–19] and bistable [20–29] nonlinear characteristics has been carried out to improve the energy conversion efficiency over a wide range of operating frequencies.”