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

Abstract

The present invention proposes a quasi-zero-rigid vibration isolation device with high linear resonance frequency based on two pairs of oblique springs, including two pairs of oblique spring assemblies, a vertical spring assembly, a loading platform assembly and a supporting structure; the loading platform assembly and The two pairs of oblique spring assemblies are hingedly connected, the loading platform assembly is in contact with the vertical spring, and the two pairs of oblique spring assemblies and the vertical spring assembly are fixedly connected to the support structure through bolts. In the initial state, the intersection point O of two pairs of oblique springs with the same stiffness and length is located in the vertical range between the fixed point of the upper oblique spring and the static equilibrium position; the static equilibrium position is located in the middle of the vertical distance between the fixed points of the upper and lower oblique springs point. While the invention maintains a wide quasi-zero stiffness range, the distance from the initial position to the static equilibrium position is reduced, and the bearing mass is small; 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 of the linear system is poor, which greatly improves the vibration isolation performance of the quasi-zero stiffness system.

Description

technical field [0001] The invention relates to the technical field of mechanical structure vibration isolation, in particular to a quasi-zero-rigid vibration isolation device with high linear resonance frequency based on two 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 isolator, the quasi-zero stiffness range is narrow, and the vibration isolation performance is not ideal. Therefore, the invention patent with application number 201910863713.3 discl...

AI Technical Summary

Problems solved by technology

[0003] In view of 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 two oblique springs, which solves the technical problem of low corresponding linear resonance frequency in the prior art

Images