Ultra-low frequency air spring isolator based on negative stiffness structure of axially magnetized magnetic ring

Abstract

The ultra-low frequency air spring isolator based on the negative stiffness structure of the axially magnetized magnetic ring belongs to the field of precision vibration isolation technology, including a double-chamber air spring isolator and a negative stiffness magnetic spring. The negative stiffness magnetic spring is coaxially nested in the double cavity In the main air chamber of the air spring vibration isolator, the bottom of the main air chamber is provided with an annular rubber pad, and 2 to 10 orifices are evenly arranged between the main air chamber and the additional air chamber; The inner fixed magnetic ring, the moving magnetic ring and the outer fixed magnetic ring are coaxially nested with magnetization and axial height centers on the same horizontal line; the invention has low natural frequency, large damping coefficient, high integration and stability, and can avoid impact disturbance The excitation causes a rigid collision between the moving magnetic ring and the bottom of the main air chamber, realizing 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 an ultra-low frequency air spring vibration isolator based on the negative stiffness structure of an axially magnetized magnetic ring. 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 environm...

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, an ultra-low frequency air spring isolator based on the negative stiffness structure of the axially magnetized magnetic ring is proposed. The air spring isolator can achieve ultra-low frequency Vibration isolation effect, 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 of the system Damping and eddy current damping help accelerate vibration energy attenuation and reduce resonance peaks

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