Composite Electromagnetic Friction Damper

Abstract

The invention relates to a compound electromagnetic friction damper. The friction damper comprises an electromagnet, a friction plate, disc springs, friction force adjusting bolts, extrusion cone rings, a circular outer cylinder, a stop catch cylinder, a sliding shaft, a controller, a sensor, end cover plates, fixing nuts and inserted pin connecting parts, wherein the friction plate is arranged on the inner side of the circular outer cylinder and consists of a plurality of arc-shaped plates formed by dividing a cylinder by through seams in the axial direction; the two end parts of the arc-shaped plates are oblique sections with a certain gradient in the axial direction; the extrusion cone rings and the disc springs, which are the same as the friction plate in gradient, are arranged on two sides of the end part of the friction plate; the friction force adjusting bolts on the outermost side are connected with the end cover plates through threads. When the electromagnet is electrified, a corresponding electromagnetic attraction force is generated between the electromagnet and the friction plate according to the sliding displacement, so that variable friction can be realized; meanwhile, the pressure between the friction plate and the electromagnet can be changed to change the sliding force intensity of the damper.

Description

technical field [0001] The invention relates to the field of structural engineering, in particular to a composite friction damper combining electromagnetic friction and conventional friction, which is installed on engineering structures to resist dynamic effects such as strong winds and earthquakes. Background technique [0002] In order to reduce the vibration response of structures and equipment, energy-dissipating shock absorbers can be arranged on structures and equipment to consume the energy input by earthquakes, so as to reduce the damage caused by vibration to structures and equipment. At present, there are many types of energy-dissipating shock-absorbing devices researched and developed, which can be divided into the following categories according to their different energy-dissipating mechanisms: viscoelastic dampers, viscous dampers, metal dampers and friction dampers. [0003] The friction damper is an energy-dissipating shock-absorbing device that utilizes the fr...

AI Technical Summary

Problems solved by technology

The main defect of the general conventional friction damper is that the preload of the damper cannot be changed automatically during the sliding process, so the friction force it provides usually remains unchanged, and the hysteresis curve of the damper is close to a rectangle. This type of friction The damper cannot change the magnitude of the friction force in real time according to the intensity of the structural vibration load, so that the friction damper slides or does not slide prematurely, so that the damper designed under the action of a strong earthquake will not slide at all under the action of a weak earthquake. However, the damper designed under the action of weak earthquakes will not achieve the ideal damping effect due to the small output force under the action of strong earthquakes.

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