Research on the Vibration Reduction Effect of Track System Based on Phononic Crystal Theory

Research purposes: Aiming at the problem of vibration and noise caused by high-speed railway crossing airport terminal, this paper analyzes the disadvantages of traditional track vibration reduction technology in high-speed railway crossing terminal. Based on phononic crystal theory, a new phononic crystal damping pad is introduced to reduce the vibration level of 60~80 Hz and the influence of train operation on people in the airport terminal. Taking the Chengdu-Zigong high-speed railway line passing through the Tianfu airport terminal as an example, the multi-rigid body dynamics software UM (Universal Mechanism) and the finite element software ANSYS are used to the simulation. By establishing two train-track-tunnel rigid-flexible coupling dynamics models of different foundation, the vibration absorption effect of the new phononic damping pad and the ordinary damping pad is compared and analyzed to verify the vibration absorption effect of the new phononic cushion. Research conclusions: (1) The vibration peak value of the low frequency range of each structure of the track that used new phononic crystal damping pad based on the local resonance band gap mechanism of phononic crystals is reduced, and the vibration absorption performance is more significant in the specific frequency band (63~100 Hz). The damping effect is the best in the frequency band range of 80 Hz, which is 9.9 dB smaller than that in the ordinary isolation pad. (2) The research results can be used for vibration reduction and noise reduction of ballastless track of high-speed railway near or under the airport and special buildings. © 2020, Editorial Department of Journal of Railway Engineering Society. All right reserved.