Electro-active quasi-zero stiffness vibration isolator

Abstract

The electro-active quasi-zero stiffness vibration isolator comprises an output platform, the circumferential edge of the upper end face of the output platform is fixed to the inner edge of an annular dielectric elastomer film, the outer edge of the annular dielectric elastomer film is fixed to the top end of a frame, and a supporting column is arranged at the bottom of the output platform; the bottom face of the supporting column is an arc-shaped convex face protruding outwards, two rollers make contact with the arc-shaped convex face, the rollers are rotationally connected to the supporting rod and play a role in supporting the supporting column, the end, away from the rollers, of the supporting rod extends into the frame and can slide inwards, and a linear spring is embedded in the supporting rod. The supporting rod is provided with a lifting lug used for being rotationally connected with the roller, and the two ends of the linear spring abut against the lifting lug and the frame respectively. The device is large in vibration isolation frequency range and low in vibration isolation starting frequency; the rigidity of equipment is adjusted through an electroactive material to adapt to interference of load change; and the electroactive material has active deformation capability, so that the equipment can be easily and actively controlled.

Description

Technical field [0001] The present invention relates to the field of vibration isolators, and more particularly to an electrically active quasi-zero rigidity isolator. Background technique [0002] Compared to linear systems, quasi-zero-stiffness, QZS vibration isolators have close to the ideal high-static and low-dynamic stiffness, HSLD feature, suitable for low-frequency vibration isolation. In general, the QZS isolator is achieved by combining positive stiffness and negative stiffness elements in parallel (Ibrahim, 2008). Positive stiffness is usually achieved by linear linear spring 4, while the negative strength mechanism has different types. In early studies, researchers designed that the oblique linear spring 4 mechanism provides a negative strength or using a linear spring 4 structure to realize the negative strength of the system. [0003] The dielectric elastomer film is an electrically active intelligent material having ultravilylability, and there is a force-displacem...

AI Technical Summary

Problems solved by technology

In addition, traditional quasi-zero stiffness vibration isolators are only designed for vibration isolation of fixed loads and cannot adapt to load changes

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