Nonlinear damping vibration isolator, floating slab with nonlinear damping vibration isolator and floating slab track system

Abstract

The invention discloses a non-linear damping vibration isolator, a floating slab with the nonlinear damping vibration isolator and a track system . The non-linear damping vibration isolator comprisesa fixing part and a moving part. The fixing part comprises a base, a damping cylinder part and a sleeve, and the damping cylinder part is fixed in the middle of the base; the sleeve is correspondinglypositioned outside the damping cylinder part and is fixed along the peripheral side of the base; the moving part comprises a top cover, a steel spring and a damping piston, and the top cover is located above the sleeve and movably connected with the upper end of the sleeve in a sealed mode; the steel spring is sleeved between the damping cylinder part and the sleeve, and the upper and lower endsof the steel spring correspondingly abut against the top cover and the base; one end of the damping piston is fixed with the top cover and the other end is positioned in the damping cylinder part; a damping hole is formed in a cylinder body of the damping cylinder part, the linear distance between the cylinder body and the inner wall of the sleeve is gradually changed, and damping liquid is contained in the damping cylinder part and the sleeve. The variable damping characteristic of the vibration isolator can be achieved, the resonance peak of the vibration isolator is reduced and the high-frequency load is not amplified, vibration of a roadbed slab is weakened, and meanwhile noise is lowered.

Description

technical field [0001] The invention relates to the technical field of rail vibration reduction and noise reduction, in particular to a nonlinear damping vibration isolator and a floating plate rail system with the same. Background technique [0002] In order to reduce the environmental vibration and noise caused by subway operation, a large number of urban rails have adopted vibration-damping rails, among which steel spring floating slab rails have the best vibration-damping effect. However, studies have shown that the steel spring floating slab track has an obvious damping effect on the vibration of the conventional frequency band above 20Hz, but for the low-frequency vibration of the subway, its vibration damping effect is not ideal, and vibration components may even appear in the low frequency band Magnification phenomenon. [0003] Due to the low frequency and relatively long wavelength, the low-frequency part of the vibration has a strong ability to pass through strat...

AI Technical Summary

Problems solved by technology

Due to the limit and cost of the railway infrastructure, as one of the key components of the track structure, the increase in the mass of the track slab has a limited vibration reduction effect; if the stiffness of the track structure is reduced, the natural frequency can be reduced, but the stiffness is too large. Then the displacement of the track structure will increase, which will bring hidden dangers to the safety of train operation, so it is impossible to further reduce the impact of vibration in the low frequency range through the above methods

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