Large load ultra-low frequency air spring vibration isolator based on negative stiffness magnetic spring

Abstract

A large load ultra-low frequency air spring vibration isolator based on a negative stiffness magnetic spring belongs to the technical field of precision vibration isolation. The vibration isolator comprises a dual-chamber air spring vibration isolator and the negative stiffness magnetic spring, wherein the negative stiffness magnetic spring is coaxially nested in a main air chamber of the dual-chamber air spring vibration isolator, the bottom of the main air chamber is provided with a ring rubber gasket, and 2-10 orifices are evenly arranged between the main air chamber and an additional air chamber; the negative stiffness magnetic spring is coaxially nested by a fixed magnetic ring magnetized in the radial direction, and an upper moving magnetic ring and a lower moving magnetic ring thatare symmetrically arranged about the axial height center of the fixed magnetic ring, and the upper moving magnetic ring and the lower moving magnetic ring are magnetized in opposite directions in theaxial direction. The large load ultra-low frequency air spring vibration isolator based on the negative stiffness magnetic spring has low natural frequency, large damping coefficient and high integration, and can realize the low frequency / ultra-low frequency vibration isolation effect of precision instruments and equipment.

Description

technical field [0001] The invention belongs to the technical field of precision vibration reduction, in particular to a large-load ultra-low frequency air spring vibration isolator based on a negative stiffness magnetic spring. Background technique [0002] In the process of installation, testing and experimentation of precision instruments and equipment, low-frequency vibration interference in the environment has become one of the key issues affecting research results. Equipping precision instruments and equipment with large-load air spring vibration isolators has gradually become a constraint in the field of large-scale ultra-precision engineering. The main technical means of environmental micro-vibration, but the research on air spring isolators still has the following problems: [0003] (1) The natural frequency of the air spring isolator is high, and it cannot suppress the low-frequency / ultra-low-frequency vibration interference in the environment. Existing air spring...

AI Technical Summary

Problems solved by technology

[0011] The purpose of the present invention is to solve the problem that the high natural frequency of the air spring vibration isolator with large load cannot meet the low-frequency / ultra-low-frequency vibration isolation requirements of precision instruments and equipment. Due to the problem that the negative stiffness magnetic spring has no corresponding protection measures, a large-load ultra-low frequency air spring isolator based on a negative stiffness magnetic spring is proposed, which can achieve ultra-low frequency vibration isolation effect under large load conditions , so as to effectively isolate the environmental micro-vibration interference of high, medium and low frequency bands, improve the vibration isolation level of the anti-micro-vibration laboratory, and ensure that various ultra-precision instruments and equipment work in the optimal environment. At the same time, the orifice damping and eddy current of the system Damping helps accelerate vibration energy decay and reduce resonance peaks

Images