Ultralow frequency vibration isolator based on parallel connection of positive stiffness spring and negative stiffness spring

Abstract

The invention discloses an ultralow frequency vibration isolator based on parallel connection of a positive stiffness spring and a negative stiffness spring, comprising a guide post, a sheath cover, a sliding block, a negative stiffness spring, a lower cover, a guide seat, a ball and a main spring. According to the invention, the main spring (a positive stiffness spring) is connected with the negative stiffness spring in parallel, thus a vibration damper can have the characteristics of high static stiffness and low dynamic stiffness, and zero-hertz ultralow frequency vibration isolation is realized; connection of a screw thread pair is adjusted, thus a stiffness curve of a vibration isolator is adjusted according to vibration isolation quality, and vibration isolation performance can be adjustable; and rolling friction is realized by adopting balls, thus frictional resistance is reduced. The ultralow frequency vibration isolator disclosed by the invention can be used as one component and is applicable to an environment under vibrational excitation, especially an environment under low frequency vibrational excitation, such as a vehicle seat, a suspension, precise instrument vibration isolation as well as vibration attenuation and seismic resistance.

Description

technical field [0001] The invention relates to an ultra-low frequency vibration isolator based on parallel connection of positive and negative stiffness springs. The invention is suitable for vibration isolation of machinery and equipment under low-frequency excitation environments, such as vehicle suspensions, seats, cabs, various precision measuring instruments, and Anti-seismic building structures, etc. technical background [0002] Linear vibration isolation technology has been very mature, but in low-frequency excitation environments (such as vehicle seats, precision measuring instruments, etc.), linear vibration isolation has the contradiction between good low-frequency vibration isolation effect and large static displacement. Therefore, in the research of low-frequency vibration isolation Among them, passive nonlinear vibration isolation technology, active and semi-active vibration isolation technology are being extensively studied. [0003] Among them, active and s...

AI Technical Summary

Problems solved by technology

However, the application of this technology is not widespread at present, and it is only limited to the vibration isolation of certain types of equipment, and the nonlinear vibration isolation equipment designed based on this principle does not have the performance adjustable with the mass, and on some equipment, This adjustability is very important, such as vehicle seats, because the driver's weight difference is relatively large, requiring vibration isolation equipment to have adjustable performance

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