Ultralow-frequency air spring vibration isolator based on axial magnetization magnetic ring negative stiffness structure

Abstract

The invention relates to an ultralow-frequency air spring vibration isolator based on an axial magnetization magnetic ring negative stiffness structure, and belongs to the technical field of precisionvibration isolation. The ultralow-frequency air spring vibration isolator based on the axial magnetization magnetic ring negative stiffness structure comprises a double-chamber air spring vibration isolator and a negative stiffness magnetic spring, the negative stiffness magnetic spring is coaxially nested in a main air chamber of the double-chamber air spring vibration isolator, an annular rubber pad is arranged at the bottom of the main air chamber, 2-10 throttling holes are uniformly formed between the main air chamber and an additional air chamber, the negative stiffness magnetic spring is formed by coaxially nesting an inner fixed magnetic ring, a movable magnetic ring and an outer fixed magnetic ring which are magnetized in the same direction in the axial direction, and the axial height centers of the inner fixed magnetic ring, the movable magnetic ring and the outer fixed magnetic ring are located on the same horizontal line. The ultralow-frequency air spring vibration isolatoris low in inherent frequency, large in damping coefficient and high in integration degree and stability, rigid collision between the movable magnetic ring and the bottom of the main air chamber caused by impact disturbance excitation can be avoided, and the low-frequency / ultra-low-frequency vibration isolation effect of precise instruments and equipment is achieved.

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...

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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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