Overdamped vibration isolator capable of generating negative stiffness through inclined magnets

Abstract

The invention provides an overdamped vibration isolator capable of generating negative stiffness through inclined magnets. The overdamped vibration isolator comprises a central shaft, wherein three bosses are sequentially arranged in the axial direction of the central shaft; the central shaft is connected with an upper fastened end cover and a lower fastened end cover through a pair of mutually-pressed springs; a pair of mutually-pressed springs is arranged between the two bosses in the middle and at the bottom of the central shaft and used for limiting an intermediate annular permanent magnet and enabling the intermediate annular permanent magnet to axially move; a sliding bearing is mounted on the top part of the upper end cover and used for limiting the central shaft and enabling the central shaft to axially move; inclined annular permanent magnets are fastened onto the upper end cover and the lower end cover; the inclined magnets fixed to the upper end cover and the lower end cover and the annular permanent magnet form magnetic springs for supplying negative stiffness to the vibration isolator. A portion of the vibration energy of an object subjected to vibration isolating is transferred to the annular permanent magnets, so that the vibration can be reduced; meanwhile, phase difference occurs between the elastic recovery forces of positive stiffness and negative stiffness, so that the vibration isolator can inhibit the vibration in a resonance area through the overdamping property. The overdamped vibration isolator has the characteristics of being high in bearing capacity, simple in structure, convenient to use, low in cost, and wide in applicable scope.

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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