Multidirectional ultralow-frequency vibration energy collector

Abstract

The embodiment of the invention discloses a multidirectional ultralow-frequency vibration energy collector, and relates to the technical field of vibration energy collection. The collector can achieve the frequency raising conversion through the nonlinear vibration theory, and can avoid the disadvantage that a conventional spring quality structure cannot obtain a lower inherent frequency. The collector comprises a universal shaft coupler (1), wherein the top of the universal shaft coupler (1) is fixed on a foundation structure frame; a piezoelectric spring structure which consists of a displacement amplification mechanism (2), an assembly mass block (3), a piezoelectric stack (4), a flexible hinge (5), and a mass block (6). The bottom of the universal shaft coupler (1) is fixed with the top of the displacement amplification mechanism (2). The flexible hinge (5) is connected with the displacement amplification mechanism (2) and the mass block (6).

Description

technical field [0001] The invention relates to the technical field of vibration energy collection, in particular to a multi-directional ultra-low frequency vibration energy collector. Background technique [0002] Environmental energy harvesting technology is a technology that converts one or several energy sources in the surrounding environment into electrical energy in a certain way. This technology can replace traditional chemical batteries to power independent devices with low power consumption, and has very important application prospects. Typical applications, such as automobile tire pressure monitoring devices, can avoid the trouble of frequent battery replacement through environmental energy self-supply technology; also such as ultra-large-scale wireless sensor networks, if battery-powered technology is used, there will be maintenance items for battery replacement almost every day, resulting in Ultra-high maintenance costs, not to mention the placement of sensor no...

AI Technical Summary

Problems solved by technology

The disadvantage of adopting this design idea is that once the peak frequency of the environmental vibration source is relatively low, the electromechanical coupling structure will generate large electric energy amplitude and long cycle under low-frequency excitation, which greatly increases the difficulty of electric energy extraction for subsequent circuits.

In addition, if the peak frequency is extremely low, such as the vibration energy introduced by human body movement, the frequency is lower than 1Hz, and the wave energy in the marine environment, the frequency is around 1Hz, the structure of the piezoelectric oscillator designed by the general idea will be very fragile (low stiffness, mass Big)

At present, the industry has developed an up-frequency electromechanical coupling structure to avoid the above problems, but at the same time, a series of new problems such as energy dissipation and low fatigue life have appeared in the electromechanical coupling structure.

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