High linearity quasi-zero stiffness vibration isolator

Abstract

The invention provides a high-linearity quasi-zero stiffness vibration isolator which comprises a supporting plate, an upper frame, a lower frame, eight sets of horizontal spring mechanisms, eight sets of connecting rod mechanisms, a three-permanent-magnet mechanism, four sets of vertical supporting mechanisms and a base. Mounting holes are machined in the supporting plate. Four of the eight sets of horizontal spring mechanisms are installed on the upper frame and connected with the supporting plate through bolts. The other four of the eight sets of horizontal spring mechanisms are installed on the lower frame and connected with the base through the four sets of vertical supporting mechanisms. The upper frame and the lower frame are connected through bolts. The connecting rod mechanisms are installed between the eight sets of horizontal spring mechanisms and the three-permanent-magnet mechanism and connected in a hinged mode. A groove is designed to be formed in the middle of the joint between the upper frame and the lower frame and used for fixing a middle permanent magnet of the three-permanent-magnet mechanism. According to the high-linearity quasi-zero stiffness vibration isolator, main nonlinear stiffness terms are counteracted, high linearity of the quasi-zero stiffness vibration isolator is guaranteed, dynamic behaviors of quasi-zero stiffness are more stable through the achievement of high linearity, the vibration isolation performance is more excellent, and the high-linearity quasi-zero stiffness vibration isolator can be better used for vibration control.

Description

technical field [0001] The invention relates to a vibration isolation device, in particular to a vibration isolation device which can be used in the field of low frequency vibration isolation. Background technique [0002] In recent years, quasi-zero stiffness vibration isolators have received more and more attention because of their excellent high static stiffness and low dynamic stiffness characteristics. There are also various ways to achieve quasi-zero stiffness, among which the more typical methods are: mechanical Spring type, permanent magnet type, rubber spring type and electromagnet type ([1] R.A. Ibrahim. "Recent advances in nonlinearpassive vibration isolators." J. Sound Vib, 2008). However, the quasi-zero stiffness characteristics achieved by the above schemes often have the problem of poor linearity. In other words, they have to add some nonlinear stiffness while realizing the quasi-zero stiffness characteristics, and sometimes the added nonlinearity is very stro...

AI Technical Summary

Problems solved by technology

Studies have pointed out that this kind of permanent magnet quasi-zero stiffness technology will introduce cubic nonlinear stiffness when it is realized, and its dynamic behavior is more complicated ([2] A. Carrella. "On the design of a high-static–low- dynamic stiffness isolator using linear mechanical springs and magnets." J. Sound Vib, 2008)

[0005] To sum up, the existence of nonlinearity (especially strong nonlinearity) will not only have a great impact on the dynamic characteristics of the system, but also make it very difficult to control in the field of active control

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