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Research on floating slab track isolator based on mixed media theory

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Abstract

To improve the control effect of the floating slab track system under low-frequency vibration, a vibration isolator scheme based on a liquid and gas mixture is proposed. Taking the elastic element of the air cushion as the research object, the fluid-structure coupling theory is used to analyze its deformation law under high load conditions, and the nonlinear stiffness calculation method of the liquid and gas mixture isolator is given and verified. Using the theory of mixed media, the parameters and structure of the liquid-gas mixture isolator are designed and trial-manufactured. The wheel load drop is used to analyze and compare the low-frequency vibration reduction effects of different elastic supports. The vibration reduction effect of the liquid and gas mixture isolator relative to the steel spring isolator and rubber isolator is 4.75 dB and 10.12 dB, respectively, showing a good comprehensive vibration control effect.

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Abbreviations

p oil :

Pressure of liquid

F :

External load

S :

Area of the container

V :

Volume of gas

V 0 :

Initial volume of gas

ΔV :

Volume change of gas

\(\overline{X_{i}}\) :

Average coordinate of the element on the x direction

n ix :

Cosine of the element normal and the x direction

A i :

Area of the element surface

p :

Pressure of gas

n :

Amount of substance

R :

Gas constant

T :

Temperature of gas

c p :

Specific heat at constant pressure

c v :

Specific heat at constant volume

Y :

Specific heat ratio

U :

Internal energy of gas

E :

Specific internal energy of gas

E 0 :

Initial specific internal energy of gas

m :

Mass of gas

ρ :

Density of gas

ρ 0 :

Initial density of gas

N :

Number of air cushions

h :

Displacement of piston

VAL i :

Vibration levels of the ith center frequency

a i :

The effective value of acceleration at the ith center frequency

a ref :

The reference value of acceleration

C i :

Z weighted factor of the ith center frequency

VL z :

Z vibration level

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Acknowledgements

This work has been supported by the Institute of Wheel/Rail System of Tongji University.

Author information

Authors and Affiliations

  1. Shanghai Tong-Tech Vibration Control Co., Ltd., Shanghai, China

    Zheng Fang

  2. Institute of Rail Transit, Tongji University, Shanghai, China

    Chuanzhi Geng

Authors
  1. Zheng Fang
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Corresponding author

Correspondence to Zheng Fang.

Additional information

Zheng Fang is an Assistant Engineer at Shanghai Tong-Tech Vibration Control Co., Ltd., Shanghai, China. He received his M.S. in Transportation Engineering from Tongji University. His research interests include track structure and vibration control technology.

Chuanzhi Geng is a Professor at the Institute of Rail Transit, at Tongji University. He received his Ph.D. degree in civil engineering from Tongji University in 2006. His research interests include vibration and noise control of rail transit.

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Fang, Z., Geng, C. Research on floating slab track isolator based on mixed media theory. J Mech Sci Technol 37, 5031–5045 (2023). https://doi.org/10.1007/s12206-023-0910-y

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  • DOI: https://doi.org/10.1007/s12206-023-0910-y

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