Broadband high-reliability piezoelectric beam coupled energy collection device

Abstract

The invention discloses a broadband high-reliability piezoelectric beam coupled energy collection device, which is formed by a plurality of piezoelectric beams arranged in the housing. The opposite ends of the piezoelectric beams are connected through a mass block made of a ferromagnetic material and a limit bolt to control large deformation under over-impact load. The housing is internally provided with a permanent magnet, which produces a magnetic field at the place of the mass block to form a piezoelectric magneto-elastic structure. Under the external vibration loading condition, the vibration energy is transferred to the housing, which makes the piezoelectric beams generate nonlinear vibration perpendicular to the piezoelectric beams, so that wideband energy collection is realized. Thetail ends of the piezoelectric beams are connected to an energy collection module, and the energy collection module collects electric charges generated by vibration of the piezoelectric beams. The device has the characteristics of large strain, wide response frequency and high charge output of the piezoelectric beams, as well as reliability of the structure in the vibration energy collection process, thereby not only ensuring efficient vibration energy collection, but also ensuring long-term reliable and stable working condition of the structure.

Description

technical field [0001] The invention relates to an energy harvesting device, in particular to a broadband and high reliability piezoelectric beam coupling energy harvesting device. Background technique [0002] At present, there is no power supply for railway freight train carriages. If it is necessary to monitor the state of the freight carriages during travel, the sensor terminals installed in the carriages need to solve the power supply problem by themselves; according to the fact that the wheel-rail contact of the carriages can provide continuous vibration energy during travel One feature, the collection of vibration energy provides a solution to the power supply problem of the sensor. The vibration energy harvesting device based on the piezoelectric cantilever structure has been widely studied because it can provide large strain design and high charge output. In practical engineering applications, there are often large impact loads acting on the piezoelectric beam struc...

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Problems solved by technology

[0002] At present, there is no power supply for railway freight train carriages. If it is necessary to monitor the state of the freight carriages during travel, the sensor terminals installed in the carriages need to solve the power supply problem by themselves; according to the fact that the wheel-rail contact of the carriages can provide continuous vibration energy during travel One feature, the collection of vibration energy provides a solution to the power supply problem of the sensor. The vibration energy harvesting device based on the piezoelectric cantilever structure has been widely studied because it can provide large strain design and high charge output. In practical engineering applications, there are often large impact loads acting on the piezoelectric beam structure, and the root of the piezoelectric beam is prone to fatigue fracture, which has inherent defects in structural reliability.

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