Variable-stiffness variable-damping vibration absorber based on characteristics of magneto-rheological fluid

Abstract

The invention discloses a variable-stiffness variable-damping vibration absorber based on characteristics of a magneto-rheological fluid. According to the vibration absorber, the characteristics of the magneto-rheological fluid are changed through vibration data detected by a vibrating sensor, therefore, the stiffness and the damping of the vibration absorber are changed to realize the adjustment of natural frequency of the vibration absorber, and a best vibration absorption effect is achieved. The vibration absorber is good in vibration absorption effect, and can perform a good vibration absorption function under a fixed vibration frequency; the natural frequency of the vibration absorber is adjustable and can be adjusted according to different excitation frequencies so as to achieve the best vibration absorption effect; during a vibration process, the natural frequency of the vibration absorber is adjusted continuously through the detection of the sensor, and real-time tracking is achieved to ensure that the best vibration absorption effect is maintained during the vibration process; due to semi-active control, the consumed outside energy is little; the vibration absorber is simple in structure, easy to achieve and high in feasibility; and combination use is facilitated, and a plurality of vibration absorbers can be combined and used for multi-frequency vibration.

Description

technical field [0001] The invention relates to a vibration absorber, in particular to a vibration absorber with variable stiffness and variable damping based on the characteristics of magneto-rheological fluid. Background technique [0002] Vibration is ubiquitous in people's daily life and work. In life, there are rotating electric fans hanging overhead, cars driving on the road, and locomotives running on tracks, etc.; in work, machine tools for processing workpieces in factories, trusses that swing with the wind on construction sites, etc. The existence of vibration has affected people's life, and even endangered people's life safety, so reducing or even eliminating vibration has become a subject of continuous research. [0003] The shock absorbers invented today are based on three modes: passive control mode, active control mode, and semi-active control mode. Vibration absorption is one form of vibration reduction. The vibration absorber based on the passive cont...

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Problems solved by technology

[0004] With the development of science and technology, the traditional vibration absorber with narrow natural frequency can no longer meet the needs, and the development of vibration absorber is developing towards broadband and multi-frequency

Patent No.201120197689.3 is a vibration absorber with multiple natural frequencies. The base of the vibration absorber is equipped with multiple spring plates with different effective lengths and mass blocks with different weights are installed on the spring plates. The mass blocks are on the spring plates. The position can be adjusted, so its natural frequency can be expanded. The disadvantage is that the process of adjusting its natural frequency is cumbersome, and it cannot be adjusted in real time during the vibration process; the external energy consumption is large, and its use is limited due to the use of permanent magnets. ;Active control needs to provide external energy and its control of the active force is more complicated, requiring fast response and relatively high cost

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