Floating slab track vibration isolator integrating particle damping vibration absorption and band gap vibration resistance

Abstract

The invention relates to the field of track vibration and noise reduction, in particular to a floating slab track vibration isolator integrating particle damping vibration absorption and band gap vibration resistance. The vibration isolation device comprises a vibration isolation assembly, the vibration isolation assembly comprises a connector of a rotary structure, an inner ring rubber layer, an outer ring rubber layer, a steel vibrator shell and a plurality of damping particles filled in the steel vibrator shell, the connector is provided with a containing groove, the inner ring rubber layer is located in the containing groove, the inner ring rubber layer is connected with an aluminum alloy connector, and the outer ring rubber layer is located in the containing groove. The outer ring rubber layer is coaxially sleeved on the outer peripheral surface of the connector, and the steel vibrator shell is sleeved on the outer peripheral surface of the outer ring rubber layer; the multiple sets of vibration isolation assemblies are arranged in the axial direction, and the two connectors in the adjacent vibration isolation assemblies are connected. The requirements for rigidity and low-frequency band gaps can be met, and resonance peak surge is avoided when vibration and noise reduction are conducted on the track.

Description

technical field [0001] The invention relates to the field of rail vibration reduction and noise reduction, in particular to a floating plate rail vibration isolator combining particle damping vibration absorption and band gap vibration isolation. Background technique [0002] Rail transit often has excessive environmental vibration problems. According to different control objects, it can be divided into control at the vibration source, control at the transmission path, and control at the vibration receiver. The control measures at the vibration source usually include vibration-absorbing fasteners, elastic sleepers, and floating slab tracks; the control in the transmission path usually includes vibration-isolation trenches and vibration-isolation piles; the control of the vibration-receiving body usually has vibration-isolation supports, etc. Controlling vibration at the vibration source directly weakens the generation and transmission of vibration energy, which is also the m...

AI Technical Summary

Problems solved by technology

[0003] Most of the existing phononic crystal isolators are designed using the local resonance mechanism or the Bragg scattering mechanism. Through theoretical analysis and finite element analysis, for multi-layer cells, the middle rubber slot can increase the bandgap, but it will increase the thickness of the steel plate on both sides can increase the width of the band gap, the cut-off frequency will be significantly increased, and the initial frequency will also be slightly increased, which has little effect on the stiffness, but the vertical size of the overall structure is limited, and the increase in thickness is affected by limit; increasing the elastic modulus of the rubber in the middle layer can improve the overall stiffness, but it will also increase the elastic wave velocity, resulting in a decrease or even disappearance of the band gap

In short, it is very difficult to obtain an elastic laminate that meets the requirements of stiffness and low-frequency bandgap with only steel, rubber, and cast iron for existing phononic crystal isolators.

In addition, limited by materials and structural space, there has been no good solution to the surge of resonance peaks in the bandgap frequency band.

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