Piezoelectric multiband vibration energy harvesting device based on folded beam structure

Abstract

The invention discloses a piezoelectric multiband vibration energy harvesting device based on a folded beam structure, which generates power by using deformation of a piezoelectric material, and belongs to the field of energy saving technology and energy recovery. The piezoelectric multiband vibration energy harvesting device based on the folded beam structure comprises a folded beam, a square mass frame, a columnar fixing pin, a square block and a base. Under the condition that the environment vibration frequency is low in engineering, vibration energy can be collected in multiple frequency ranges through resonance of the units, so that the problems that an existing cantilever beam type energy harvester is narrow in working frequency band and limited in resonance working interval under natural conditions are solved, and the working efficiency of the cantilever beam type energy harvester is improved. The method is of great significance in improving the energy harvesting efficiency and playing a role in the practical application of the related energy harvesting device.

Description

technical field [0001] The invention designs a piezoelectric multi-frequency band vibration energy harvesting device based on a folded beam structure, which utilizes deformation of piezoelectric materials to generate electricity, and belongs to the field of energy-saving technology and energy recovery. Background technique [0002] There is abundant vibration energy in the natural environment, especially in the field of engineering, there is a large amount of vibration energy that affects the precision and life of machinery, so various vibration energy harvesting devices have emerged as the times require, and the use of energy harvesting devices for environmental vibration energy recovery has become current research hotspot. An energy harvester is a device that converts vibrational mechanical energy into electrical energy. Compared with other types of energy harvesters, piezoelectric energy harvesters have the advantages of compact structure, easy processing and higher energ...

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Problems solved by technology

Because the vibration frequency in the surrounding environment is generally low, and the traditional cantilever energy harvester device only has a low first-order natural frequency, and can use the first-order resonance to capture more electric energy, but the other natural frequencies are very high. As a result, the working range of the energy harvesting device is narrow, and there is a problem of low energy harvesting efficiency. It also brings many limitations to the application of the cantilever beam energy harvester in practical engineering problems, and it is difficult to be widely promoted in practical problems.

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