A magnetorheological fluid damping platform with quasi-zero stiffness

Abstract

The invention relates to a magnetorheological fluid vibration reduction platform with quasi-zero stiffness. The platform comprises a movable platform mechanism and a peripheral fixed platform mechanism; the peripheral fixed platform mechanism consists of an upper fixed platform, a bracket and a lower fixed platform, and is fixed through bolts and nuts; the movable platform mechanism is arranged in the peripheral fixed platform mechanism; a movable platform is hinged to a single-cylinder magnetorheological fluid vibration reducer through a single-cylinder magnetorheological fluid vibration reducer upper spherical hinge base; the upper fixed platform is connected above the movable platform through three double-cylinder magnetorheological fluid vibration reducers; the lower fixed platform is connected below the movable platform through thesingle-cylinder magnetorheological fluid vibration reducer; the movable platform is positioned in the middle position; the magnetorheological fluid vibration reducers in the upper and lower positions form a vibration reduction system with quasi-zero stiffness in space; multiple displacement sensors or multiple gravity sensors are uniformly distributed at the periphery of the movable platform for detecting a vibration direction and feeding backthe same to a control system; and the control system adjusts current values of all dampers of the double-cylinder magnetorheological fluidvibration reducers according to feedback signals so as to adjust damping numerical values of the dampers in all positions.

Description

technical field [0001] The invention relates to a low-frequency or ultra-low-frequency vibration damping platform, in particular to a magnetorheological fluid vibration damping platform with quasi-zero stiffness and a control method thereof, belonging to the technical field of vibration damping platforms. The vibration-absorbing platform has good effects in force vibration isolation and motion vibration isolation, and can be widely used in the fields of vehicles, ships, and air transportation. Background technique [0002] Vibration isolation refers to the use of additional systems to isolate the vibration source and the controlled object to achieve the purpose of suppressing the vibration of the controlled object. In modern society, people's requirements for the vibration environment, product and structure vibration characteristics have been further improved, such as the vibration isolation protection of high-precision optical instruments by the optical vibration isolation ...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is that the existing quasi-zero stiffness vibration damping platform has a poor damping effect on micro-amplitude vibrations; the adjustment of stiffness adaptability to load changes is poor; the structure is not compact enough, the load capacity is small, and the scope of application Small

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