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

Inactive Publication Date: 2013-11-27
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the narrow operating frequency band of the traditional piezoelectric cantilever can

Method used

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  • Piezoelectric energy collector based on linear resonator and nonlinear vibration exciter
  • Piezoelectric energy collector based on linear resonator and nonlinear vibration exciter

Examples

Experimental program
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Example Embodiment

[0027] Example 1

[0028] figure 1 It 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; k a — stiffness of the linear resonator; c a — damping constant of the linear resonator; m a —mass of the linear resonator; m t - the mass of the end mass; m Ｓ —The second mass in the nonlinear vibration exciter is the mass of the excitation mass; m Ｎ —The third mass in the nonlinear vibration exciter is the mass of the passive mass; v—the initial distance between the two mass blocks in the nonlinear vibration exciter; (x m ,0)—the position of the nonlinear exciter; (x a ,0)—the position of the linear resonator; k m —Stiffness of the resonance element in the nonlinear exciter; c m — the damping constant of the resonant element in the nonlinear exciter; c r — Energy ...

Example Embodiment

[0045] Example 2

[0046] figure 2 It 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. Each symbol in the figure represents: k a — stiffness of the linear resonator; c a — damping constant of the linear resonator; m a —mass of the linear resonator; m t - the mass of the end mass; m Ｓ — the mass of the excitation mass in the nonlinear exciter; m Ｎ - the mass of the passive mass in the nonlinear exciter; k m —Stiffness of the resonance element in the nonlinear exciter; c m — the damping constant of the resonant element 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, a piezoelectric energy harvester based on linear resonators and nonlinear exciters includes an energy harvesting structure a...

Example Embodiment

[0050] Example 3

[0051] In this embodiment, a piezoelectric energy harvester based on linear resonators and nonlinear exciters 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 exciter The piezoelectric cantilever beam 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 beam and are connected to the piezoelectric cantilever beam. The piezoelectric sheet is parallel to the piezoelectric cantilever beam. The two axial surfaces of the cantilever beam are connected with an energy collection circuit; the energy collection circuit includes a full-bridge rectifier circuit and a collection capacitor. The piezoelectric cantilever beam adopts a copper base layer and a piezoelectric sheet is attached to one side; the...

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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 ...

Claims

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Application Information

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IPC IPC(8): H02N2/18
Inventor 刘海利黄震宇佘寻峰
Owner SHANGHAI JIAO TONG UNIV
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