A self-resetting magnetic fluid damper

Abstract

The invention discloses a self-reset magnetic fluid damper. The self-reset magnetic fluid damper comprises an outer tube, an inner tube, outer tube inner casing tubes, inner tube outer casing tubes, damper pistons, a magnetorheological fluid, permanent magnets, a magnetism isolating ring, sealing end plates, a left side spring and a right side spring, wherein first bosses are inwards arranged on the inner wall of the middle of the outer tube, outer tube fixing baffles are inwards arranged at two ends of the outer tube and are round baffles provided with round holes formed in the middles, the outer tube inner casting tubes are fixedly arranged on the inner wall of the outer tube between the first bosses and the outer tube fixing baffles, and second bosses are arranged at the ends, close to the first bosses, of the outer tube inner casting tubes. A force is transferred in the inside through the inner tube, the outer tube and the casting tubes, assembly is simple, a welding range is greatly decreased, change of the metallographic structure and mechanical performance of a steel product caused by welding and residual welding stress are avoided, and the stress performance of the members is more stable. The self-reset magnetic fluid damper is convenient to use and has higher reliability.

Description

technical field [0001] The invention relates to the technical field of magnetic fluid dampers, in particular to a self-resetting magnetic fluid damper. Background technique [0002] Earthquake is a major natural disaster faced by human beings for a long time, causing a large number of casualties and damage or collapse of buildings. When a building encounters a strong earthquake that is higher than the fortification intensity of the area, even if the overall integrity of the structure is maintained, due to excessive deformation and serious damage to some components, extensive reinforcement and repair is required, and even it can only be demolished and rebuilt. A huge waste has affected people's normal life. For this reason, a new type of disaster distribution control system-self-recovery functional structure has emerged, which can not only consume the energy transmitted to the main structure by the earthquake, realize the disaster distribution function, control the occurrenc...

AI Technical Summary

Problems solved by technology

The shape memory alloy self-resetting damper makes full use of the superelastic properties of the shape memory alloy, and the flag-shaped hysteresis curve is full, which reduces or even eliminates the residual deformation, but the performance of the shape memory alloy is affected by temperature, and it needs to pass the shape after deformation. Memory alloy heating can make it return to the state before deformation, and the temperature rise may have adverse effects on other components of the damper; the self-restoring energy-dissipating support using prestressed steel bars cannot meet the typical frame due to the shortcoming of the small elastic deformation of prestressed steel bars The need for displacement between structural floors

Studies have shown that when the residual deformation angle of the structure after the earthquake is greater than 0.5%, the maintenance cost of the structure is greater than the reconstruction cost

Under the action of a magnetic field, the magnetorheological fluid can be transformed from a Newtonian fluid with good fluidity into a Bingham viscoplastic with high viscosity and low fluidity in milliseconds, and the magnetorheological damper made has a large output, It has the advantages of low energy consumption and fast response, but the traditional magneto-rheological damper has no reset ability and cannot provide reset force, and usually has a large residual deformation after an earthquake; due to the viscosity of the magnetorheological fluid in the traditional magnetorheological damper Low, in the absence of external energy, the damping force is very small, and earthquake disasters are more destructive to civil structures, so the control system is very likely to fail during an earthquake and the external energy cannot be applied to the damper device Make the control of the damper invalid. Most of the existing magneto-rheological dampers work with a large current, and the coil has heat dissipation problems.

[0004] Therefore, it is necessary to provide a self-resetting magnetic fluid damper, which can solve the problems that the performance of the existing self-resetting shape memory alloy damper is affected by temperature and needs to be heated after deformation to return to the state before deformation, and the elastic deformation of prestressed steel bars is small and The traditional magnetorheological damper has large residual deformation after earthquake and needs external energy input

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