A novel two-degrees-of-freedom piezoelectric energy harvester

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Investigation of Multimodal Electret-Based MEMS Energy Harvester With Impact-Induced Nonlinearity (2018, unknown): “Various 2DOF harvesters have been developed, including 2DOF cut-out beam structures [5], L-shaped beam configurations [6], 2DOF electromagnetic-piezoelectric hybrid structures [7], dual-mass cantilever beam [8], dual-beam system [9], [10] and dynamic amplifier system [11].”
Development of a broadband nonlinear two-degree-of-freedom piezoelectric energy harvester (2014, methodology): “Wu et al. (2013) proposed a ‘‘cut-out’’ 2- degree-of-freedom (2-DOF) harvester with a secondary beam enclosed within the main beam, which achieves two close resonances with significantly large amplitudes.”
A review of energy harvesting using piezoelectric materials: state-of-the-art a decade later (2008–2018) (2019, background): “mechanical boundary conditions and different beam configurations, including designs with a dynamic amplifier support instead of a fixed end [151] (figure 3(c)), an asymmetric tuned mass [152] (figure 3(d)), clamped-clamped boundary conditions with compressive load [150], multiple inertia masses [153”