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- Title
Stiffness and Damping Matching Design Analysis of Damping Layers for Ballastless Track.
- Authors
GENG Mingjing; YAO Li; WANG Yezhou; ZHAO Caiyou
- Abstract
As the high-speed rail network continues to be encrypted, it is inevitable to cross environmentally sensitive areas, and the vibration problem caused by the operation of the train will become increasingly serious. Damping layers is often used for vibration control, but most of its parameter values are considered unilaterally, and the lack of coordinated design leads to poor vibration damping effect. To explore the design matching value of the stiffness and damping for the damping layer, the coupling model of vehicle-damping layer track-substructure was established in the finite element software. The dynamic response of the track structure under the combined values of different damping layers parameters was analyzed by using the display dynamics. By eliminating extreme conditions through code value, the vibration-suppressing effect under different parameter combination values was comprehensive analyzed by using acceleration vibration level, transmission loss and insertion loss. The conclusions were as follows: (1) When the dynamic response of each structure of the track met the code values, the stiffness of the damping layer should be no less than 60 MPa/m, and the damping should not be less than 0.1 MN·s/m³; (2) The vibration-suppressing effect was generally negatively correlated with the stiffness, and the dynamic response of the base plate was small when the combined values of the stiffness-damping of the damping layer were 60 MPa/m, 0.1 MN·s/m ³, 100 MPa/m, and 0.1 MN·s/m ³, respectively; (3) From the perspective of transmission loss, the damping layer could effectively weaken the middle and high frequency vibration energy of the track, from the perspective of insertion loss, although the layer would amplify some low-frequency vibrations, but the vibration-suppressing effect of the middle and high frequency segments was better. After comparison, the stiffness-damping combined value of the damping layer was 100 MPa/m, 0.1 MN·s/m ³. The results showed that the coordinated design of the damping layers parameters could maximize its vibration damping performance.
- Publication
Railway Standard Design, 2023, Vol 67, Issue 12, p90
- ISSN
1004-2954
- Publication type
Article
- DOI
10.13238/j.issn.1004-2954.202204240004