Compression spring type six-degree-of-freedom quasi-zero stiffness vibration isolator and design method thereof

Abstract

The invention discloses a compression spring type six-degree-of-freedom quasi-zero stiffness vibration isolator and a design method thereof. The compression spring type six-degree-of-freedom quasi-zero stiffness vibration isolator comprises a fixed outer framework, a box body subjected to vibration isolation arranged in the outer framework, and vibration isolating modules which are respectively distributed on the six surfaces of the box body subjected to vibration isolation and connected with the outer framework and the box body subjected to vibration isolation; each vibration isolating module comprises a framework fixed to the outer framework, and a connecting piece fixed to the box body subjected to vibration isolation; a vertical compression spring is arranged inside the framework in the vertical direction; four lateral compression springs are arranged in the lateral direction of the framework; all the four compression springs which are the same as one another are connected with the framework and the connecting piece through joint bearings, so that the compression springs are guaranteed to be capable of rotating freely relative to the framework and the connecting piece. The six-degree-of-freedom quasi-zero stiffness vibration isolator has symmetry, so that restoring force characteristics which are the same as one another exist in three translation directions, and restoring moment characteristics which are the same with one another exist in three rotation directions. The invention further discloses a design method of the vibration isolator. The vibration isolator can realize low frequency vibration isolation in six directions.

Description

Technical field [0001] The present invention relates to a vibration isolator, in particular to a compression spring type six-degree-of-freedom quasi-zero stiffness vibration isolator and a design method thereof. The vibration isolator of the present invention has good low-frequency vibration isolation characteristics and is used for isolating precision instruments. The vibration field has important application value. Background technique [0002] Precision instruments have high requirements on the use environment, especially the vibration in the environment will seriously affect the use of the instrument. Therefore, it is necessary to design a vibration isolator to reduce the vibration of the instrument. For the vibration isolator, the smaller the spring stiffness used, the better the vibration isolation effect; but reducing the stiffness will reduce the load-bearing capacity of the vibration isolator. Therefore, the researchers put forward the concept of "quasi-zero stiffness ...

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Problems solved by technology

[0003] At present, there are many design schemes for single-degree-of-freedom quasi-zero-stiffness vibration isolators, but there are few studies on multi-degree-of-freedom, especially six-degree-of-freedom quasi-zero-stiffness isolators

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