Multistage piezoelectric energy harvesting device for point-supported floating slab track

Abstract

The invention discloses a multi-stage piezoelectric energy harvesting device for a point-supported floating slab track, and belongs to the technical field of piezoelectric energy harvesting. The multi-stage piezoelectric energy harvesting device comprises: a shell which is of a columnar structure, wherein a columnar energy harvesting cell cavity is formed in the shell in a penetrating mode in the axial direction; two end plates which respectively cover the top surface and the bottom surface of the energy harvesting cell cavity; and energy harvesting cells which are arranged in the energy harvesting cell cavities, wherein each energy harvesting cell comprises a spring, a stacked energy harvesting column, a spring and a mass ball from top to bottom, the spring, the stacked energy harvesting column and the spring are connected in sequence, the surface of the mass ball is sleeved with a bent energy harvesting plate, and the outer side wall of the bent energy harvesting plate is fixedly connected with the inner side wall of the energy harvesting cell cavity. Piezoelectric energy harvesting can be realized in a limited rail transit tunnel space, vibration energy can be fully utilized to perform d31 and d33 mode multi-stage energy harvesting through the structural arrangement of the device, the piezoelectric energy harvesting efficiency is greatly improved, and the device has the advantages of being simple in structure, reasonable in design and easy to manufacture.

Description

technical field [0001] The invention belongs to the technical field of piezoelectric energy harvesting, and more specifically relates to a multi-stage piezoelectric energy harvesting device for a point-supported floating plate track. Background technique [0002] In recent years, with the development of the city, the scale and population are increasing day by day. The operation of rail transit not only alleviates the congestion of the city, but also brings great convenience to people. During the operation of rail transit, the long-term monitoring of the train operating environment is of great It helps people understand the operation status of the line and ensure driving safety, but the life cycle of monitoring sensor network nodes is heavily dependent on battery life. It can be said that the energy supply problem is a key factor restricting monitoring sensors. [0003] There have been some examples of using the piezoelectric energy harvesting theory to obtain energy from the...

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Problems solved by technology

[0003] There are already some examples of using the piezoelectric energy harvesting theory to obtain energy from the subway, using the vibration energy generated by the floating slab track when the subway is running to generate electricity, For example, Chinese Patent Publication No. CN 112054717 A discloses a piezoelectric energy harvesting device and its application and method on the floating plate track. This type of method has the following limitations: (1) On the basis of the original steel spring support, the piezoelectric energy harvesting device is added in series, which increases the height of the floating plate supported by the support. It will affect the applicability of the piezoelectric energy harvesting device; (2) The piezoelectric energy harvesting device uses a single d33 mode for energy harvesting, and the energy harvesting efficiency is not high

The piezoelectric energy harvester of this application transfers the absorbed energy to the energy harvesting part through the damping part, so that the deformation of the energy harvesting part increases and the electric energy increases, which improves the energy harvesting efficiency. The problem of low energy harvesting efficiency of the energy harvesting device, but the piezoelectric energy harvester in this application has a large structural size and requires a large installation space, which cannot be effectively applied to the limited space at the track of the floating plate

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