Study on Modelling Method of Resilient Mat Used under Floating Slab Track

Abstract

Kelvin’s model is widely used to simulate the dynamic characteristic of a resilient mat under a slab track. To develop an effective calculation model for a resilient mat using a solid element, a three-parameter viscoelasticity model (3PVM) was employed. With the help of the user-defined material mechanical behavior, the proposed model was implemented in software ABAQUS. To validate the model, a laboratory test was performed on a slab track with a resilient mat. Then, a finite element model of the track-tunnel-soil system was built. The calculation results using the 3PVM was compared with those using Kelvin’s model and the test results. The results indicate that the 3PVM can better reflect the dynamic characteristics of resilient mat than Kelvin’s model, especially over 10 Hz. Compared with the test results, the 3PVM has an average error of 2.7 dB and a max error of 7.9 dB at 5 Hz.

In-situ measurement of subway train-induced vibration and noise of steel spring floating slab with MEMS-based sensing units

“…To predict the dynamic performance and assess the vibration reduction effect of different noise and vibration mitigation measures, extensive research has been carried out using analytical and numerical approaches [4,[8][9][10][11], as well as experimental tests [1,9]. However, the simplification in modeling and the uncertainty of the key parameters involved in the simulation models affected their accuracy [12].…”