High-linearity resonance frequency quasi-zero stiffness vibration isolation device based on three pairs of oblique springs

Abstract

The invention provides a high-linearity resonance frequency quasi-zero stiffness vibration isolation device based on three pairs of oblique springs. The device comprises three pairs of oblique springassemblies, a vertical spring assembly, an object carrying platform assembly and a supporting structure, wherein the object carrying platform assembly is in hinged connection to the three pairs of inclined spring assemblies, the object carrying platform assembly is in contact connection to a vertical spring, the three pairs of inclined spring assemblies and the vertical spring assembly are fixedlyconnected to the supporting structure through bolts, and in an initial state, intersection points of the three pairs of inclined spring assemblies are located within a vertical distance between a fixing point of the pair of inclined spring assembly on the upper side and a static equilibrium position, and the static equilibrium position is a middle point of two fixed points of the middle pair of inclined springs. According to the device, a distance from an initial position to the static equilibrium position is reduced while a wide-quasi-zero stiffness range is maintained, a bearing mass is small, under the condition that stiffness of the vertical spring is unchanged, a linear natural frequency is increased, vibration isolation frequency band difference between a quasi-zero stiffness systemand a corresponding linear system is increased, and performance of a vibration isolation frequency band of the quasi-zero stiffness system is greatly improved.

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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