A Broadband High Reliability Piezoelectric Beam Coupled Energy Harvesting Device

Abstract

The invention discloses a broadband and high-reliability piezoelectric beam coupling energy collection device, which is composed of a plurality of piezoelectric beams installed in a housing, and the opposite ends of the piezoelectric beams are connected by a mass block of a ferromagnetic material and a limit bolt. The large deformation under the impact load is controlled. At the same time, a permanent magnet is installed in the casing to generate a magnetic field at the mass block, forming a piezoelectric electromagnetic elastic structure. Under the condition of external vibration loading, the vibration energy is transmitted into the shell, causing the piezoelectric beam to generate nonlinear vibration perpendicular to the piezoelectric beam, realizing broadband energy collection; the end of the piezoelectric beam is connected to the energy harvesting module, and the energy harvesting module collects the voltage The electric charge produced by the vibration of the beam. The present invention has the characteristics of large strain of the piezoelectric beam, wide response frequency range, and high charge output, and at the same time takes into account the reliability of the structure in the vibration energy collection process; thereby not only ensuring the high-efficiency vibration energy collection ability, but also ensuring the long-term reliable and stable operation of the structure state.

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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