Magneto-rheological semi-active damper with adjustable stiffness

Abstract

The invention discloses a magneto-rheological semi-active damper with adjustable stiffness. The damper comprises an outer annular cylinder fixed on the inner wall of a container and an inner cylinder;scrollable balls are arranged between the lower portion of the inner cylinder and a bottom plate of the device, and the inner cylinder and the outer annular cylinder are filled with a magneto-rheological liquid respectively; hollow spring pipes are connected between the cylinder walls of the inner cylinder and outer annular cylinder, the inner cylinder and the outer annular cylinder are communicated with each other through the hollow spring pipes, the magneto-rheological liquid can flow in the inner cylinder and the outer annular cylinder through the hollow spring pipes, the outer portions ofthe spring pipes are provided with magnet exciting coils, the magnet exciting coils, controllers and a solar panel arranged at the outer side of the upper portion of the container are connected in series to form a closed loop circuit, the controllers receive signals of acceleration sensors to control the current in the magnet exciting coils, thereby adjusting the stiffness of the hollow spring pipes and achieving the horizontal damping control; limiting plates are arranged between the outer annular cylinder and the inner cylinder to prevent the inner cylinder from being displaced too much; damping nets are arranged in the outer annular cylinder, and the torsion damping control is achieved through damping force.

Description

technical field [0001] The invention belongs to the field of vibration control of civil engineering, in particular to a controllable stiffness damper based on magnetorheological fluid, which is mainly used for controlling the level and torsional vibration response of high-rise buildings and towering structures. technical background [0002] With the progress and development of society, high-rise buildings and towering structures have become more and more popular architectural forms, and the structure is developing in the direction of flexibility and towering, while the dynamic response of towering structures under earthquake and wind loads is strong. Seriously affect the safety, applicability and durability of buildings. Therefore, how to reduce the dynamic response of buildings so that they have good wind and earthquake resistance while meeting the requirements of aesthetics and comfort has attracted more and more attention. [0003] At present, there are many vibration re...

AI Technical Summary

Problems solved by technology

However, due to the constraints of the nature of the coil spring itself, it is impossible to change its own damping and stiffness to meet the vibration reduction requirements under different strengths, which will easily cause the vibration frequency of the damper to be out of tune with the vibration frequency of the structure, and the frequency that can be controlled narrow range

At the same time, in the case of large-scale structural vibration, the coil spring is prone to large deformation, which cannot effectively control the structural vibration.

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