Three-cylinder type large-capacity magneto-rheological damper

Abstract

The invention discloses a three-cylinder type large-capacity magneto-rheological damper for vibration control of a large civil engineering structure, which comprises a magneto-rheological damping cylinder (9), a puddle damping cylinder (5), an auxiliary cylinder (19), a magneto-rheological main piston (23), a puddle piston (6), a piston rod (17), a sealing baffle (20), a damping channel (16), a cylinder cover (3) and a spherical hinge joint (13), wherein magneto-rheological liquid (11) is filled in the magneto-rheological damping cylinder, and an annular excitation coil (8) capable of generating a magnetic field is arranged in the magneto-rheological damping cylinder; and the puddle damping cylinder is arranged adjacent to the magneto-rheological damping cylinder, and elastic puddle (7) is filled in the inner cavity of the puddle damping cylinder, thus the damper can generate large damping under the condition of large displacement, and the safety of the damper can be improved. By arranging a displacement splitting mechanism (18), the magneto-rheological damper has high rigidity and large damping in a low-frequency region and has low rigidity and small damping in a high-frequency region. Compared with the traditional magneto-rheological damper with the same size, the maximum capacity of the damper of the invention is improved by more than one time, and the vibration control of the large civil engineering structure is more effective.

Description

technical field [0001] The invention mainly relates to the field of dampers, and is a damper used for anti-vibration (vibration) of large-scale civil engineering structures, especially a three-cylinder type large-output magnetic flow with large output and high energy consumption that can provide adjustable damping force variable damper. Background technique [0002] Strong earthquakes have caused huge disasters to people all over the world. The massive destruction and collapse of buildings in earthquakes is the direct cause of earthquake disasters. my country is one of the countries with the most serious earthquake disasters in the world. Among the 450 cities in the country, 74.5% are located in the earthquake zone. Among the 28 large cities with a population of over one million, 85.7% are located in the earthquake zone. In May 2008, the magnitude 8 earthquake in Wenchuan, Sichuan Province caused nearly 70,000 deaths, 18,000 missing, nearly 380,000 people were disabled, a...

AI Technical Summary

Problems solved by technology

Therefore, the single use of conventional magnetorheological dampers installed in civil engineering structures will greatly reduce the safety in earthquake resistance and disaster reduction, and cannot form an effective safety guarantee mechanism for the controlled structure.

Moreover, conventional magneto-rheological dampers mostly use a single energy dissipation mechanism, and the damping force that these dampers can provide is limited

The initial viscosity of magnetorheological fluid is low. Although a larger damper can be designed to provide greater damping force, when the structural vibration control system installed with magnetorheological fluid damper fails and cannot provide electrical energy, this The magnetorheological fluid damper developed only by a single energy consumption mechanism does not have the damping adjustment function of ordinary passive hydraulic shock absorbers. At this time, the magnetorheological fluid damper cannot play its due role for large civil engineering structures. The energy dissipation and shock absorption effect of

However, the damper made solely by using the energy dissipation characteristics of the cement material only has a passive energy dissipation effect, and it is impossible to realize real-time intelligent control of the damping force, which is limited for the vibration control effect of large civil engineering structures

In addition, if a conventional magneto-rheological damper is arranged in a large-scale civil engineering structure to control the vibration of the structure, the project cost will be increased, and its bulky and large volume will bring trouble to the construction and affect the usable space of the building.

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