Effect of air damping on the dynamic characteristics of a mesh type elastic backing plate

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Journal of Vibration and Shock ›› 2022, Vol. 41 ›› Issue (14) : 24-32.

BAI Yanbo，HE Zhenxing，YUN Jianfeng，ZHANG Peng，WANG Zhixuan

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Abstract

A large number of elastic pads are used to reduce the impact of vibration in the foundation of rail transit trains. In order to improve the damping of the elastic pad and consume more vibration energy, an air damping mesh type elastic pad is proposed. The backing plate uses the difference in elasticity of different materials to form a main air chamber and an auxiliary air chamber in the cavity of the elastic unit, and the two air chambers are communicated with a throttle hole. Under the action of the train's dynamic load, the gas in the two gas chambers reciprocately flow in the orifice to produce a damping effect. Studies have shown that the aperture of the orifice and the volume ratio of the air chamber are the key parameters that affect the dynamic performance of the elastic pad. Reducing the ratio of the aperture of the orifice and the volume of the air chamber can reduce the stiffness of the elastic pad and increase its damping. The stiffness and damping of the air damping mesh elastic pad can be flexibly adjusted by changing the throttle hole diameter and the air chamber volume ratio, and its performance is better than ordinary mesh elastic pads and mesh elastic pads filled with high damping materials. The backing plate uses air damping to replace the damping material filled in the mesh, which can save a lot of production costs.
Keywords: air damping; elastic backing plate; orifice aperture; air chamber volume ratio; damping ratio

Key words

air damping / elastic backing plate / orifice aperture / air chamber volume ratio / damping ratio

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BAI Yanbo，HE Zhenxing，YUN Jianfeng，ZHANG Peng，WANG Zhixuan. Effect of air damping on the dynamic characteristics of a mesh type elastic backing plate[J]. Journal of Vibration and Shock, 2022, 41(14): 24-32

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