Quasi-zero-rigid vibration isolation device with high linear resonance frequency based on three pairs of oblique springs

Abstract

The present invention proposes a quasi-zero-rigid vibration isolation device with high linear resonance frequency based on three pairs of oblique springs, including three pairs of oblique spring assemblies, a vertical spring assembly, a loading platform assembly and a supporting structure; the loading platform assembly and The three pairs of oblique spring assemblies are hingedly connected, the loading platform assembly is in contact with the vertical spring, and the three pairs of oblique spring assemblies and the vertical spring assemblies are fixedly connected to the supporting structure through bolts; in the initial state, the intersection of the three pairs of oblique spring assemblies is located on the upper side The vertical distance between the fixed point of a pair of oblique spring components and the static equilibrium position, the static equilibrium position is the middle point between the two fixed points of the oblique spring in the middle. The invention maintains a wide range of quasi-zero stiffness, while reducing the distance from the initial position to the static equilibrium position, and reducing the bearing mass; when the stiffness of the vertical spring remains unchanged, the linear natural frequency increases, increasing the quasi-zero stiffness system and corresponding The vibration isolation frequency band difference of the linear system greatly improves the vibration isolation frequency band performance of the quasi-zero stiffness system.

Description

technical field [0001] The invention relates to the technical field of vibration isolation of mechanical structures, in particular to a quasi-zero-rigid vibration isolation device with high linear resonance frequency based on three pairs of oblique springs. Background technique [0002] The high static and low dynamic vibration isolator is composed of a negative stiffness structure and a positive stiffness structure, so that the negative stiffness offsets the positive stiffness, and the dynamic stiffness reaches a quasi-zero state, while maintaining a high static load capacity. Types of structures that achieve negative stiffness are cam rollers, magnetic springs, inclined coil springs or beams, plate structures, and truss structures (X-shaped). Due to the existing high static and low dynamic vibration isolators, the quasi-zero stiffness range is narrow and the vibration isolation performance is not ideal. Therefore, the invention patent with application number 201910864288.X...

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Problems solved by technology

[0003] Aiming at the deficiencies in the above-mentioned background technology, the present invention proposes a quasi-zero-rigid vibration isolation device with high linear resonance frequency based on three pairs of oblique springs, which solves the technical problem of high corresponding linear resonance frequency in the prior art

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