Nonlinear vibration absorber with multi-stable-state rigidity

Abstract

The invention discloses a nonlinear vibration absorber with multi-stable-state rigidity. A shaft sleeve is fixedly connected to a rotation shaft. An inner magnet is arranged between two outer magnets.One ends of connecting rods are inserted in small circular holes, and the other ends of the connecting rods are fixedly connected with the shaft sleeve. One ends of segmented linear rods are fixedlyconnected with the shaft sleeve, the other ends of the segmented linear rods are arranged in large circular holes, and certain gaps are kept between the other ends and the large circular holes. One ends of pre-tightening rods are fixedly connected with the shaft sleeve, the other ends of the pre-tightening rods make contact with one radial inner surfaces of square holes, and accordingly pre-tightening force is provided. Poles of the two outer magnets are repulsive to poles of the opposite inner magnet, and the distances between the two outer magnets and the inner magnet are the same. Accordingto the provided nonlinear vibration absorber with multi-stable-state rigidity, the segmented linear rigidity is generated through contact of the segmented linear rods and the opposite gaps on an inner magnet supporting disc, and in addition, rigidity can be reduced; and negative rigidity is achieved through annular magnets, the structure is simple, design is reasonable, and stability is good.

Description

technical field [0001] The invention relates to the mechanical field, in particular to a vibration absorbing device, in particular to a nonlinear vibration absorber for suppressing the vibration of a rotor system. Background technique [0002] With the continuous development of modern industry, the application of machinery is becoming more and more extensive, especially the large-scale and high-speed operation machinery is increasing. Due to the continuous improvement of operating speed, the vibration problem of mechanical equipment has attracted more and more attention. Vibration can easily cause structural fatigue damage, affect the life of equipment, and reduce the measurement accuracy of instruments and meters. At the same time, vibration can also generate noise, which affects the normal work of operators and even endangers their health. [0003] At present, vibration absorption methods include passive vibration absorption and active vibration absorption. The structure ...

AI Technical Summary

Problems solved by technology

The structure of the passive vibration absorber is simple, the manufacturing cost is low, the installation is convenient, and the performance is relatively stable. In practical engineering applications, the external excitation frequency generally changes repeatedly within a certain range. At this time, the vibration damping effect of the vibration absorber will deteriorate sharply due to detuning; the active vibration absorber overcomes the shortcomings of the traditional dynamic vibration absorber. It has the characteristics of effective frequency bandwidth, good vibration suppression effect and strong adaptability, but at the same time, it has defects such as large energy consumption and easy instability of the system

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