Vibration isolator with zero frequency characteristic

Abstract

The invention discloses a vibration isolator with a zero frequency characteristic. According to the fundamental principle of the vibration isolator, a non-linear geometry mechanism is formed by four horizontal springs, two perpendicular springs and four connecting rods, the rigidity of the horizontal springs is a half of the rigidity of the perpendicular springs, the compression amount of the horizontal springs is equal to the length of the connecting rods, and thus the zero-rigidity vibration isolator used for isolating ultra-low frequency vibration in the vertical direction is designed. The vibration isolator has a high-static-rigidity and low-dynamic-rigidity characteristic near the work balance position of the vibration isolator, can be used for isolating ultra-low-frequency and large-displacement vibration, can effectively reduce inherent frequency of a vibration isolating system, and can broaden a vibration isolation frequency band. The vibration isolator can be combined with a modal test technology and carry out free-state modal testing.

Description

Technical field[0001]The present invention belongs to the field of ultra-low frequency isolation, and is specifically involved in a vibration isolator having zero-frequency characteristics.Background technique[0002]With the scale and complication of engineering technology, the performance improvement of vibration vibration isolation equipment is particularly important, and ultra-low frequency isolation is one of the key points and difficulties of engineering applications and scientific research. Active vibration isolation system is very effective for solving low frequency vibration, but its structure is complex, manufacturing cost is high, and it is difficult to widely applied to engineering. The traditional passive vibration isolation system needs to achieve low frequency isolation, reducing the stiffness of the system, but the reduction in the stiffness will result in load carrying capacity and stability. The quasi-zero-rigid vibration isolator is parallel to the system with a neg...

AI Technical Summary

Problems solved by technology

However, this type of quasi-zero stiffness vibration isolator will cause nonlinear behaviors such as jumping and multi-stability when the vibration amplitude is too large or the stroke is large, which will affect the vibration isolation effect.

It is difficult for the quasi-zero stiffness vibration isolator in the prior art to achieve true zero stiffness, so there is still the problem of low frequency resonance

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