Method of Damping Spa Bridges Using Electromagnetic Energy Harvesting-Shock Absorbers

Abstract

The invention discloses a multi-frequency electromagnetic energy collecting shock absorber for SPA (Segmental Precast Assembled) bridges. The multi-frequency electromagnetic energy collecting shock absorber comprises a casing, wherein four independent cavities are formed in the casing; a vibration component is respectively arranged in each cavity; the inherent frequencies of the vibration components in the cavities are different; the vibration components comprise mass blocks which can move up and down freely, springs connected between the mass blocks and a bottom plate of the casing, at leastone flat coil arranged on the outer side walls of the mass blocks and bridge rectifiers which are arranged on the tops of the mass blocks and connected with the flat coils; and permanent magnets in one-to-one correspondence with the flat coils are arranged on the inner sides of the cavities. Compared with a conventional single vibration mode, the multi-frequency electromagnetic energy collecting shock absorber with a plurality of operating frequencies has the advantages that the operating frequency bandwidth is increased; the stability is enhanced; and the energy storing performance is more stable.

Description

technical field [0001] The invention belongs to the technical field of self-power supply for bridge health monitoring, and in particular relates to a method for damping a SPA bridge by using an electromagnetic energy collection-shock absorber. Background technique [0002] Segmental prefabricated assembled bridge (SPA bridge), as a rapid construction bridge, has been more and more widely used in urban rail transit elevated lines. Compared with bridges constructed by traditional cast-in-place methods, SPA bridges have the advantages of being green, energy-saving, and high-efficiency. However, due to the existence of seams, the section stiffness and durability of segmental prefabricated bridges have always been the focus of attention. In order to ensure the normal operation of the bridge, long-term health monitoring of the bridge is very necessary. Bridge health monitoring needs to arrange or bury components on the bridge. How to provide continuous and stable energy supply fo...

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Problems solved by technology

[0004] Patent 2018101722215 discloses an electromagnetic vibration energy harvester for urban rail transit bridge health monitoring. The electromagnetic vibration energy harvester has the advantages of high energy storage efficiency, high output power, and high power output density. However, the patent It is a linear system with a single resonant frequency. When the external excitation frequency deviates from the natural frequency of the device structure, the response of the system will be significantly reduced, so the performance of the device is extremely unstable.

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