Two-degree-of-freedom quasi-zero-stiffness low-frequency vibration isolation device

Abstract

The invention relates to the technical field of low-frequency vibration isolation, in particular to a two-degree-of-freedom quasi-zero-stiffness low-frequency vibration isolation device. A supporting flat plate is used for placing a vibration-isolated body, and the upper end and the lower end of an upper-layer vertical plane spring in an upper-layer quasi-zero-stiffness vibration isolator are perpendicularly fixed to the supporting flat plate and a middle mass block correspondingly; one end of an upper-layer nonlinear spring is connected with the side face of the supporting flat plate, the other end of the upper-layer nonlinear spring is connected with an upper-layer horizontal moving mechanism to achieve horizontal movable adjustment, and a vertical moving mechanism drives the supporting flat plate to achieve vertical movable adjustment; and the upper end and the lower end of a lower-layer vertical plane spring in a lower-layer quasi-zero stiffness vibration isolator are perpendicularly fixed to a middle mass block and a base respectively, one end of a lower-layer nonlinear spring is connected with the middle mass block, and the other end of the lower-layer nonlinear spring is connected with a lower-layer horizontal moving mechanism to achieve horizontal adjustment. The initial vibration isolation frequency of a system can be reduced, and the vibration isolation performance is superior to that of a single-degree-of-freedom quasi-zero stiffness vibration isolation system in a specific frequency region.

Description

technical field [0001] The invention relates to the technical field of low-frequency vibration isolation, in particular to a two-degree-of-freedom quasi-zero-stiffness low-frequency vibration isolation device. Background technique [0002] Vibration is a physical phenomenon ubiquitous in nature, especially in daily life and industrial production. In some cases, vibration will bring certain harm to our scientific research and production activities. Traditional linear vibration isolators are faced with the contradiction between bearing capacity and vibration isolation effect, and quasi-zero stiffness vibration isolation system, as a new nonlinear low-frequency vibration isolation technology, has changed the traditional concept of linear system vibration isolation. The quasi-zero stiffness vibration isolation system is composed of positive and negative stiffness structures connected in parallel. It not only has enough static stiffness to support the vibration isolation equipme...

AI Technical Summary

Problems solved by technology

With the rapid development of science and technology, precision machinery, shipboard equipment, and high-speed vehicles have higher and higher performance requirements for vibration isolation systems. Traditional linear vibration isolation systems and single-degree-of-freedom quasi-zero stiffness vibration isolation systems have been difficult to meet the requirements of various industries. growing demand

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