Piezoelectric energy collector based on linear resonator and nonlinear vibration exciter
A piezoelectric energy and energy harvesting technology, which is applied to piezoelectric effect/electrostrictive or magnetostrictive motors, electrical components, generators/motors, etc., can solve problems such as narrow operating frequency bands and cannot effectively collect vibration energy. To achieve the effect of widening the working frequency band, improving performance and increasing the number
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Embodiment 1
[0028] figure 1 is a schematic diagram of a piezoelectric energy harvester based on a linear resonator and a nonlinear exciter according to a preferred embodiment of the present invention. The symbols in the figure represent respectively, l—the length of the piezoelectric cantilever beam; k a — the stiffness of the linear resonator; c a — the damping constant of the linear resonator; m a —mass of the linear resonator; m t — mass of end mass; m S —the mass of the second mass block in the nonlinear vibrator, that is, the exciting mass block; m N —the mass of the third mass in the nonlinear vibrator, that is, the mass of the driven mass; v—the initial distance between the two masses in the nonlinear vibrator; (x m ,0)—the position of the nonlinear exciter; (x a ,0)—the position of the linear resonator; k m — the stiffness of the resonant unit in the nonlinear exciter; c m — the damping constant of the resonant unit in the nonlinear exciter; c r - Capacitance of energy ha...
Embodiment 2
[0046] figure 2 is a schematic diagram of a piezoelectric energy harvester based on a linear resonator and a nonlinear exciter according to another preferred embodiment of the present invention. The symbols in the figure represent respectively: k a — the stiffness of the linear resonator; c a — the damping constant of the linear resonator; m a —mass of the linear resonator; m t — mass of end mass; m S —mass of excitation mass block in nonlinear vibrator; m N —The mass of the driven mass in the nonlinear vibrator; k m — the stiffness of the resonant unit in the nonlinear exciter; c m — the damping constant of the resonant unit in the nonlinear exciter; c r - Capacitance of the energy harvesting circuit; 1, 2, 3, and 4 represent the first mass, the second mass, the third mass, and the end mass, respectively. In this embodiment, the piezoelectric energy harvester based on a linear resonator and a nonlinear exciter includes an energy harvesting structure and an energy har...
Embodiment 3
[0051] In this embodiment, the piezoelectric energy harvester based on a linear resonator and a nonlinear exciter includes an energy harvesting structure and an energy harvesting circuit, wherein the energy harvesting structure includes a piezoelectric cantilever beam, a linear resonator, and a nonlinear excitation The piezoelectric cantilever has a base layer and a piezoelectric sheet pasted along the axial direction. The linear resonator and the nonlinear exciter are located on the same side of the piezoelectric cantilever and are connected to the piezoelectric cantilever. The piezoelectric sheet is parallel to the piezoelectric Two axial surfaces of the cantilever beam are connected to an energy harvesting circuit; the energy harvesting circuit includes a full-bridge rectifier circuit and a harvesting capacitor. The piezoelectric cantilever beam adopts the configuration of a copper base layer and a piezoelectric sheet is pasted on one side; the linear resonator includes a fi...
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