Piezoelectric energy collector based on linear resonator and nonlinear vibration exciter

Abstract

The invention discloses a piezoelectric energy collector based on a linear resonator and a nonlinear vibration exciter. The piezoelectric energy collector comprises an energy collecting structure and an energy collecting circuit, wherein the energy collecting structure comprises a piezoelectric cantilever beam, the linear resonator and the nonlinear vibration exciter. According to the piezoelectric energy collector, the linear resonator is further arranged on the piezoelectric cantilever beam, so that two resonance peaks which are close to each other are obtained, and a reverse resonance peak of the energy collector can be further moved outside of the two resonance peaks through designing parameters such as the mass ratio, the frequency ratio and the position ratio of the linear resonator and the piezoelectric cantilever beam, so that a wider working band can be obtained; the arrangement of the nonlinear vibration exciter can increase the number of the resonance peaks of a system, and the working band of the system can be further expanded through designing system parameters, or the performance at a valley between the two resonance peaks can be improved.

Description

technical field

[0001] The invention relates to a vibration energy harvester, in particular to a piezoelectric energy harvester based on a linear resonator and a nonlinear exciter. Background technique

[0002] In recent years, with the development of low-energy electronics, the energy consumption level of some wireless sensors and portable devices has been greatly reduced, which makes it possible to harvest energy from the environment to power these wireless devices. Vibration energy widely exists in road and bridge construction, production equipment, and daily life. Collecting vibration energy in the environment is expected to solve the problem of regular battery replacement in wireless devices, and has become a topic of concern in recent years. Among the common electromechanical transduction mechanisms, piezoelectric materials have the advantages of easy integration, high output voltage, and suitable for low-frequency energy harvesting, so piezoelectric energy harvesters ...

Examples

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...

technical field

[0001] The invention relates to a vibration energy harvester, in particular to a piezoelectric energy harvester based on a linear resonator and a nonlinear exciter. Background technique

[0002] In recent years, with the development of low-energy electronics, the energy consumption level of some wireless sensors and portable devices has been greatly reduced, which makes it possible to harvest energy from the environment to power these wireless devices. Vibration energy widely exists in road and bridge construction, production equipment, and daily life. Collecting vibration energy in the environment is expected to solve the problem of regular battery replacement in wireless devices, and has become a topic of concern in recent years. Among the common electromechanical transduction mechanisms, piezoelectric materials have the advantages of easy integration, high output voltage, and suitable for low-frequency energy harvesting, so piezoelectric energy harvesters ...

Examples

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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