A nonlinear multidirectional piezoelectric energy recovery device

Abstract

The invention discloses a nonlinear multi-directional piezoelectric energy recovery device, which comprises a bracket and a special-shaped cantilever beam. The right side of the inner top of the bracket is fixedly connected with a special-shaped cantilever beam. For the piezoelectric sheet, a first magnet is bonded to the top of the right side of the special-shaped cantilever beam, a spring is fixedly connected to the right side of the top of the bracket, and a second magnet is fixedly connected to the top of the spring. The invention introduces magnetic force to construct a nonlinear bistable system, which is beneficial to overcome potential barriers to realize inter-well oscillations, generate frequent bistable transition oscillations, and can generate resonance under vibration excitation in a wide frequency range, thereby greatly improving broadband energy collection efficiency , In addition, the special-shaped cantilever beam structure of this structure, combined with magnetic excitation, can realize vibration energy collection in three directions, and finally realize broadband, multi-dimensional, high-efficiency vibration energy collection without real-time adjustment of structural spacing.

Description

technical field [0001] The invention relates to a nonlinear multi-directional piezoelectric energy recovery device, which belongs to the technical field of piezoelectric vibration energy harvesting and new energy development. Background technique [0002] In recent years, the development of electronic equipment has entered the era of miniaturization and low power consumption, and providing long-term stable power supply to wireless sensors has always been an important issue hindering the development of wireless sensor networks. The use of chemical batteries tends to limit the widespread application of wireless sensor networks because the batteries used in devices have several fatal disadvantages, such as: short lifetime, low power density, generation of hazardous waste, and high maintenance cost. Piezoelectric vibration energy harvesting has attracted widespread attention due to its advantages of small size and high energy density. Traditional linear piezoelectric vibration ...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a nonlinear multi-directional piezoelectric energy recovery device, which has the advantages of small size, easy to use, and strong stability, and realizes nonlinear wide-band three-directional energy recovery under the condition of only using a special-shaped cantilever beam structure. Vibration energy acquisition solves the problem that the existing vibration energy harvesting device has a single acquisition direction, complex structure, large volume, narrow acquisition frequency band, strict requirements on the external vibration environment, low vibration energy acquisition efficiency and inability to array in multiple directions. The problem of independent realization of non-linear wideband vibration energy harvesting in three directions

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