Vibration isolator with high static low dynamic stiffness characteristics and rail system with vibration isolator

Abstract

The invention provides a vibration isolator with high static low dynamic stiffness characteristics and a rail system with the vibration isolator. The vibration isolator comprises a positive stiffness assembly, a supporting part, a floating part and a negative stiffness assembly, wherein the positive stiffness assembly comprises a seat body and a first elastic piece arranged in a cavity of the seat body; the supporting part is in abutting connection with the upper end of the first elastic piece; the floating part is connected with the supporting part in a matched mode; the negative stiffness assembly comprises an elastic part and a bearing part which are matched with each other, the elastic part is connected with the supporting part or the floating part, the bearing part is arranged on the outer wall of the seat body; and the floating part bears loads and compresses the first elastic piece, and the direction of the acting force applied to the bearing part by the elastic part is inclined or vertically arranged relative to the direction of the elasticity of the first elastic piece. According to the technical scheme of the vibration isolator, the inherent frequency of an existing rail system can be reduced, the vibration isolation frequency range and the low-frequency vibration reduction effect of an existing vibration isolator and the existing rail system can be improved, and the dynamic displacement of a train when the train passes through the rail system can be effectively controlled.

Description

technical field [0001] The invention relates to the technical field of rail vibration reduction and noise reduction, in particular to a vibration isolator with high static and low dynamic stiffness characteristics and a rail system having the same. Background technique [0002] Low-frequency vibration isolation is a major research hotspot and difficulty in the field of rail transit vibration isolation. Structural vibration control can be divided into passive control, active control, semi-active control and hybrid control according to whether external energy input is required. Active control vibration isolation and semi-active control vibration isolation technologies are used to isolate low-frequency vibrations well, but their structures are complex. , takes up a lot of space, has high manufacturing costs, requires external energy, and has problems such as instability and electromagnetic pollution. In contrast, the traditional passive vibration isolation structure is simple,...

AI Technical Summary

Problems solved by technology

When choosing to increase the system damping, the damping ratio increases, and the maximum transmissibility corresponding to the resonant frequency decreases, but its transmissibility in the high frequency band increases; when the system stiffness is decreased, the natural frequency decreases Small, the initial frequency of vibration isolation decreases and the range of vibration isolation frequency increases, but its static bearing capacity decreases and static deformation increases

Therefore, for the traditional linear vibration isolation system, it is impossible to obtain a lower initial frequency of vibration isolation and a higher static bearing capacity at the same time, and the two are contradictory to each other.

This is also the main reason why the above-mentioned rail transit vibration reduction measures have poor vibration reduction effects at low frequencies.

[0004] Therefore, the vibration isolation frequency range of existing vibration isolators is narrow, and it is necessary to design a vibration isolator that can effectively isolate low-frequency vibration and control the dynamic displacement of the track at the same time for low-frequency vibration isolation in rail transit or other fields

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