A magnetorheological fluid damper with the function of increasing resistance after power loss

Abstract

The invention discloses a magnetorheological fluid damper with a power-losing resistance increase function. The magnetorheological fluid damper comprises a magnetorheological fluid damper body and three normally-closed failure power-off electromagnetic valve resistance increase systems arranged at the top and the two sides of the magnetorheological fluid damper body. Electromagnetic valves are connected with the magnetorheological fluid damper body through flanges. When the electromagnet valves lose power, resistance steel pieces are pushed to control a damping channel of the magnetorheological fluid damper body to be shrunk, and therefore the passive damping force of the magnetorheological fluid damper body is increased greatly in the power-losing state so as to achieve the function thatthe magnetorheological fluid damper body is converted into a large-tonnage passive damper. According to the magnetorheological fluid damper, the problem that the passive damping force is too small when the magnetorheological fluid damper loses power is mainly solved, losses of adjustable coulomb force in the power-losing state are made up so as to guarantee that the requirement of the passive damping force of a large civil engineering structure can still be met under power failures in the extreme conditions, and the damper has the beneficial effects of being low in cost, stable in control, easy to maintenance later and the like.

Description

technical field [0001] The invention belongs to the fields of civil engineering vibration control and mechanical automation, and in particular relates to a magnetorheological fluid damper with the function of increasing resistance when power is lost. Background technique [0002] The magnetorheological fluid damper is an intelligent, high-performance semi-active control device. The electromagnetic field in the device can convert the magnetorheological fluid from a Newtonian liquid state to a viscoplastic state with a certain shear strength within milliseconds. State, through the current-controlled magnetic field strength, to adjust the shear strength of magnetorheological fluid, so as to realize the intelligent control of the structure. Due to the advantages of simple structure, rapid response, large damping force and continuous adjustment, magnetorheological fluid dampers are very suitable for vibration control of large civil engineering structures. [0003] Another notabl...

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Problems solved by technology

However, when the external power supply is damaged (such as an earthquake) and loses the ability to supply power to the magnetorheological fluid damper, the magnetorheological fluid returns from a semi-solid state to a liquid state, and the shear strength of the magnetorheological fluid drops to a minimum. The magnetorheological fluid damper can only output a small passive damping force, which cannot meet the output requirements for large civil engineering structures

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