Quasi-zero stiffness vibration isolator with positive and negative stiffness in parallel connection

Abstract

The invention discloses a quasi-zero stiffness vibration isolator with positive and negative stiffness in parallel connection. The vibration isolator comprises a base, an upper cover, a supporting rod, spiral springs, spacers, an annular iron core, fan-shaped permanent magnet bodies, stators, a permanent magnet body clamping mechanism, working air gaps and a guide plate. The fan-shaped permanent magnet bodies, stators, permanent magnet body clamping mechanism, and working air gaps form a magnetic flow loop, and form magnetic springs with negative magnetic stiffness. The spiral springs are connected with the supporting rod and the upper cover, and initial positive stiffness of the vibration isolator is provided and is in parallel connection with magnetic negative stiffness. The dynamic stiffness of the annular iron core in the equilibrium position is reduced. The guide plate is mounted on the lower portion of the base, and is in sliding-fit with the supporting rod. Compared with an existing quasi-zero stiffness vibration isolator, the vibration isolator has the advantages that load bearing is high, and the mechanism is compact; and as a passive vibration isolator, the vibration isolator can effectively reduce the natural frequency of the vibration isolation system, broaden a vibration isolation frequency band, and has the advantages of easy maintenance and high reliability.

Description

technical field [0001] The invention relates to the technical field of low-frequency passive vibration isolation, in particular to a quasi-zero stiffness vibration isolator with positive and negative stiffness connected in parallel. Background technique [0002] Passive vibration control has been widely used in various engineering fields because it does not require external energy, the device structure is simple, easy to implement, economical and reliable. However, with the development of science and technology, and the increasingly higher requirements for the vibration environment, the vibration characteristics of products and structures, the limitations of passive vibration control are exposed. If the external disturbance frequency of the passive vibration isolator is greater than the natural frequency of the vibration isolator system of the controlled object However, when implementing low-frequency vibration isolation for external disturbances such as less than 2 Hz, pr...

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Problems solved by technology

If the external disturbance frequency of the passive vibration isolator is greater than the natural frequency of the vibration isolator system of the controlled object However, when implementing low-frequency vibration isolation for external disturbances such as less than 2 Hz, there will be problems with excessive static deformation and instability, resulting in low-frequency vibration isolation problems

Quasi-zero-stiffness vibration isolation is to realize the reduction of system stiffness under the premise of ensuring the positive stiffness of the system through the parallel structure of positive and negative stiffness, thereby reducing the natural frequency of the system and improving the vibration isolation performance, but this type of quasi-zero-stiffness vibration isolator is positive The stiffness is low and there is nonlinearity, which leads to the jumping phenomenon of the vibration isolation transmissibility, which affects the vibration isolation effect

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