Damping force bidirectionally regulating MR damper

Abstract

The invention discloses a magneto-rheological damper which damping force can be adjusted in two ways, wherein a cylinder is connected with an upper and a lower end covers, a piston rod is inserted in the steel cylinder through a sealing ring which is arranged on the end cover, a non-corrosive steel damping magnetic slab is mounted on two ends of a piston slab, a plurality of the piston slabs are provided and alternately sleeved on the piston rod with a magnetic core sleeve barrel, the end surface of each piston slab is summarily opened with two grooves along the axial direction, a permanent magnetic ring is inserted in the groove, and the outer lateral of a magnetic core sleeve barrel is winded with an excitation coil. The damper respectively realizes the largest output and the smallest output through adding with the forward current and the inverse current, not only guarantees the fail-safe (fail-safe) performance of the damper, but also effectively prevents the occurrence of locking phenomenon, on the other hand, the invention provides a novel design of a composite magnetic circuit, greatly simplifies the composite magnetic circuit structure when the permanent magnet and the excitation coil coexist, which is beneficial to the practical manufacture and installation of the damper.

Description

technical field [0001] The invention relates to a magnetorheological damping device. The proposed novel magnetorheological damper with two-way adjustment of damping force is an energy-consuming and vibration-reducing device with good performance, and can be generally applied to high-rise building structures and large-span space building structures. , bridge structures and other civil engineering structures in vibration control. Background technique [0002] Magnetorheological fluid is a suspended liquid whose shear yield strength can change with the external magnetic field and has controllable rheological properties formed by dispersing fine soft magnetic particles in a carrier liquid with low magnetic permeability; under the action of a magnetic field, the magnetic The rheological fluid can achieve a reversible change from Newtonian fluid to Bingham semi-solid within milliseconds, and can return to its original state after the magnetic field is removed. The magnetorheologi...

AI Technical Summary

Problems solved by technology

Although this type of damper also adds a permanent magnet in the damper, its function is mainly to increase the output of the damper in the zero-current state and prevent the settlement of the magnetorheological fluid, but it cannot effectively demagnetize the permanent magnet, that is, the damper is the smallest The output is too large, and the adjustable range of the damping force is too low

Images