Electromagnetic vibration reduction device for quasi-cylindrical pier of cross-sea bridge

Abstract

The invention discloses an electromagnetic vibration reduction device for a quasi-cylindrical pier of a cross-sea bridge. The electromagnetic vibration reduction device comprises electrodes, permanent magnets, a magnetic pole connector, an electrode connector, a housing and an electrode controller, wherein each electrode is connected into an annular shape through the magnetic pole connector; each permanent magnet is connected into an annular shape through the electrode connector; the thicknesses, the inner diameters and the outer diameters of the electrode and the permanent magnet are the same; the magnetic poles of two semi-annular permanent magnets in the same annular permanent magnet are opposite, the upper polarity and the lower polarity of each of two adjacent annular permanent magnets are opposite, and the polarities of two adjacent electrodes are opposite; the housing is arranged outside the electrodes; and the plurality of annular electrodes are connected with the electrode controller through conductive wires respectively. The electromagnetic vibration reduction device disclosed by the invention is capable of bilaterally controlling a flow field around a pier stud, effectively suppressing a wake flow vortex generated due to separation of boundary layers at the two sides of the pier, and then greatly suppressing the vortex generation vibration of the quasi-cylindrical pier; and meanwhile, the electromagnetic vibration reduction device further has capacities of resisting scouring, resisting an ocean current impact force and the like to a certain extent.

Description

technical field [0001] The invention belongs to the technical field of water conservancy engineering, and relates to an electromagnetic damping device used for a cylindrical pier of a sea-crossing bridge. Background technique [0002] With the continuous enhancement of my country's economic strength and the exchange of goods and goods across the Taiwan Strait, the cross-sea bridge that can provide a convenient transportation corridor has developed rapidly in my country. As an important part of the bridge, the pier is used to reliably and effectively transmit the upper load to the bridge foundation. Therefore, the safety of the pier is directly related to the efficient operation of the bridge, and the protection of the pier has also become an important link in the maintenance of the bridge. [0003] Cylindrical pier is a common bridge pier. Its shape is more suitable for the passage of ocean currents and can reduce the resistance to ocean currents. However, when the ocean cu...

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Problems solved by technology

[0005] However, this passive protection method requires more labor and is less adaptable to the external flow field.

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