Adjustable nonlinear double-layer vibration isolation device

Abstract

The invention belongs to the technical field of vibration noise control, and particularly relates to a nonlinear vibration-isolating device. The adopted technical scheme is as follows: an adjustable nonlinear double-layer vibration-isolating device comprises a nonlinear-level upper layer (1), lower-layer shock absorbers (2) and side plates, wherein the lower-layer shock absorbers (2) are lug boss-type rubber shock absorbers, and are connected with the bottom of the nonlinear-level upper layer (1). The adjustable nonlinear double-layer vibration-isolating device has the characteristics of low dynamic stiffness and high static stiffness; the low-frequency band vibration-isolating effect of the vibration-isolating device can be greatly improved while the static stability of the vibration-isolating device is ensured; the negative stiffness of the vibration-isolating device can be accurately adjusted by controlling the current magnitude and the current direction of a coil, so that the dynamic stiffness of the vibration-isolating device can be accurately adjusted and the vibration-isolating performance of the vibration-isolating device can be quickly and accurately changed; in addition, the adjustable nonlinear double-layer vibration-isolating device adopts a double-layer vibration-isolating structure, so that the high-frequency band vibration-isolating capability of the vibration-isolating device is further improved.

Description

technical field [0001] The invention belongs to the technical field of vibration and noise control, in particular to a nonlinear vibration isolation device. Background technique [0002] The effective vibration isolation bandwidth of traditional single-layer linear vibration isolators is limited by their own stiffness. For the linear vibration isolator, in order to improve its isolation ability to low-frequency vibration, its dynamic stiffness needs to be reduced, resulting in a weakening of its static stiffness, thereby reducing its bearing capacity, which is not conducive to the static stability of the vibration isolator . Therefore, scholars at home and abroad have proposed a nonlinear vibration isolation theory of "low dynamic stiffness and high static stiffness", that is, by introducing a nonlinear structure with negative stiffness into the traditional linear vibration isolator, it can offset the linear stiffness of the original vibration isolator , so as to achieve "...

AI Technical Summary

Problems solved by technology

However, most nonlinear structures are realized by mechanical methods such as buckling beams and arranging transverse springs, which make it difficult to control the negative stiffness characteristics of these nonlinear structures.

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