Frequency-raising type vibration energy collecting system and collecting method

Abstract

The invention discloses a frequency-raising type vibration energy collecting system and a collecting method. The environmental vibration frequency is sensed through a low-frequency harmonic vibration structure, and the low-frequency harmonic vibration structure is in contact and collision with a high-frequency harmonic vibration structure to cause the high-frequency harmonic vibration structure to realize self-excited vibration, so that the purpose of raising the frequency is achieved. Through the high-frequency vibration of the high-frequency harmonic vibration structure, a piezoelectric material layer on a high-frequency vibration beam is extended and compressed in a periodicity manner, the high-efficiency conversion from vibration energy to electric energy is realized, and high-density output and low operating frequency are considered together. The vibration beam with the low-frequency harmonic vibration structure has the advantages of lower structural stiffness and higher harmonic vibration quality, the resonance vibration frequency can be reduced to below 50 Hz, the response to the environmental vibration frequency is sensitive, and the application range is wider.

Description

technical field [0001] The invention belongs to the technical field of micro-energy collection, and in particular relates to an up-frequency vibration energy collection system and collection method. Background technique [0002] Vibration energy widely exists in bridges, buildings, ships, vehicles, mechanical equipment, household appliances and other production and living equipment in different forms, intensities and frequencies. Therefore, collecting vibration energy to provide power for low-power devices such as wireless sensor networks and embedded systems has broad application prospects. For example, the vibration energy harvester produced by Perpetuum has been successfully applied to the bearing monitoring of train wheels; the vibration energy harvester of Ferro Solutions has been applied to the health monitoring of ships and submarines of the US Navy. [0003] In order to achieve high-efficiency energy harvesting, the design of the vibration-type energy harvester need...

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Problems solved by technology

[0004] The current miniature vibration energy harvester has a very low power output in a low-frequency vibration environment, which cannot meet the power supply requirements of low-power devices.

In order to achieve high-density output of low-frequency vibrations, it is necessary to up-frequency the original low-frequency vibrations. The existing up-frequency energy harvesters need to assemble magnets in low-frequency and high-frequency resonance structures, through magnet attraction or repulsion Realize the conversion of low-frequency vibration to high-frequency vibration, but the magnet occupies a large area in this structure and the structure is relatively complicated, which poses a huge challenge to the miniaturization and systematic integration of the energy harvester

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