Stiffness-adjustable magnetic vibration isolator with quasi zero stiffness

Abstract

The invention belongs to the technical field of vibration and noise control and relates to a relatively-high-applicability passive isolation technology for ultralow-frequency vibration. In order to effectively solve the problem between the low-frequency vibration transmissibility and the high-frequency vibration attenuation rate of the vibration isolator, the invention provides the stiffness-adjustable magnetic vibration isolator with quasi zero stiffness, which adopts rectangular permanent magnets generating negative stiffness and an elastic capsule providing positive stiffness; and when a load is changed, the working position of the elastic capsule is controlled unchanged, the positive stiffness of the elastic capsule is changed because the pressure inside the elastic capsule is changed, and then, the negative stiffness is matched with the positive stiffness through regulating the distance among the rectangular magnets, so that the stiffness-adjustable magnetic vibration isolator with quasi zero stiffness is adaptable to vibration isolation objects with different weights. The stiffness-adjustable magnetic vibration isolator with quasi zero stiffness is simple in structure, convenient to mount, adjustable in bearing capacity, excellent in vibration isolation property, compact in structure, light in weight and suitable for popularization and application.

Description

technical field [0001] The invention belongs to the technical field of vibration and noise control, and relates to a highly applicable ultra-low frequency vibration passive isolation technology, in particular to a magnetic quasi-zero stiffness vibration isolator with adjustable stiffness. Background technique [0002] As we all know, for a single-degree-of-freedom linear vibration isolation system with mass m and stiffness k, the natural frequency of the system is Only when the excitation frequency is greater than , the system has the vibration isolation effect. For a vibration isolation system fixed by a vibration isolation object, in order to improve the vibration isolation effect of the system, it is necessary to reduce the system stiffness k, but the reduction of stiffness k will cause the static deformation of the system to increase, and it is difficult to meet the stability requirements of the system. In order to solve this technical problem, scholars have proposed...

AI Technical Summary

Problems solved by technology

On the one hand, if the weight of the vibration-isolated object is not the ideal weight of the design, that is, the vibration-isolated object is placed on the quasi-zero-stiffness vibration isolator and cannot be stabilized at the ideal static equilibrium position, the performance of the quasi-zero-stiffness vibration isolator will be affected

In response to this problem, the invention patents CN104455181A, CN203641365U, CN202132428U and CN102678804A all adjust the compression amount of the positive stiffness spring through the adjustment sleeve to make the system reach the static equilibrium position. However, the preload adjustment amount of the positive stiffness spring is limited. When there is a large deviation between the weight of the vibration object and the ideal weight of the design, this method is difficult to achieve the desired effect

On the other hand, if a certain stiffness of the vibration isolator changes, it will be difficult to achieve the ideal quasi-zero state by adjusting the preload

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