A super -damaged vibrator with negative rigidity with an inclined magnet

Abstract

A super-damping vibration isolator that uses inclined magnets to generate negative stiffness, including a central shaft, three bosses are arranged in sequence along the axial direction of the central shaft, and the central shaft is connected with the upper and lower fastening covers by a pair of springs that press against each other , A pair of counter-pressing springs are arranged between the two bosses in the middle and bottom of the central shaft to constrain the ring-shaped permanent magnet in the middle and make it move axially, and a sliding bearing is installed on the top of the upper end cover to constrain the central shaft To make it move in the axial direction, the inclined annular permanent magnet is fastened on the upper and lower end covers; the inclined magnet and annular permanent magnet fixed on the upper and lower end covers form a magnetic spring, which provides negative stiffness for the vibration isolator; Part of the vibration energy of the vibration-isolated object is transferred to the ring-shaped permanent magnet, and its vibration is attenuated; at the same time, there is a phase difference between the positive and negative stiffness elastic restoring forces, so that the vibration isolator has super-damping characteristics and suppresses the vibration in the resonance area; The invention has the characteristics of strong bearing capacity, simple structure, convenient use, low cost and wide application range.

Description

technical field [0001] The invention relates to a vibration isolator, in particular to a super-damping vibration isolator which uses inclined magnets to generate negative stiffness. Background technique [0002] When the mechanical structure is subjected to external disturbance, the system will generate forced vibration. Among them, a lot of research has been done on the suppression of harmful vibrations in actual engineering; in the fields of aerospace engineering, instrumentation, and precision engineering, mechanical vibrations often cause structural damage and failure, the decline in the measurement accuracy of instrumentation devices, and the use of structures Adverse conditions such as shortened lifespan. For example, when the spacecraft is launched, the launch accuracy is reduced due to external impact loads; when the vehicle is driving, the comfort level is reduced due to uneven road surfaces; the measurement accuracy of instruments is reduced due to external distur...

AI Technical Summary

Problems solved by technology

Among them, a lot of research has been done on the suppression of harmful vibrations in actual engineering; in the fields of aerospace engineering, instrumentation, and precision engineering, mechanical vibrations often cause structural damage and failure, the decline in the measurement accuracy of instrumentation devices, and the use of structures Adverse circumstances such as shortened lifespan

For example, when the spacecraft is launched, the launch accuracy is reduced due to external impact loads; when the vehicle is running, the comfort level is reduced due to uneven road surfaces; the measurement accuracy of instruments is reduced due to external disturbances, etc.

[0003] Passive vibration isolation technology is widely used in structural vibration suppression and vibration control due to its simple structure, low cost, easy implementation, and high stability; however, traditional linear vibration isolation systems are often only suitable for medium-high Harmful vibrations in the frequency range have a vibration isolation effect, and it is often difficult to effectively isolate vibrations in the low frequency range; therefore, in recent years, a high static stiffness-low dynamic Stiffness vibration isolators have been extensively studied, which can further broaden the vibration isolation frequency band on the basis of linear vibration isolation systems, and achieve effective suppression of low-frequency vibrations; It is relatively easy to meet the functional requirements of this type of vibration isolator, but the vibration suppression effect of this type of vibration isolation system on the resonance area is relatively poor; under the condition of meeting the actual use requirements, a compact structure is designed to achieve low-frequency vibration isolation, and can Vibration isolators that suppress vibration in the resonant region are particularly difficult

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