Testing and Modelling of Elastomeric Element for an Embedded Rail System
| Autor: | Stefano Bionda, Roberto Corradi, Andrea Collina, Egidio Di Gialleonardo, Qianqian Li |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Frequency response
Technology Materials science frequency-dependent damping elastomeric material Article Deflection (engineering) medicine General Materials Science Time domain Sensitivity (control systems) Microscopy QC120-168.85 embedded rail system Deformation (mechanics) business.industry QH201-278.5 Stiffness macro-mechanical modelling of damping Structural engineering Engineering (General). Civil engineering (General) TK1-9971 preload-dependent damping Reaction Descriptive and experimental mechanics Electrical engineering. Electronics. Nuclear engineering Standard linear solid model medicine.symptom TA1-2040 business |
| Zdroj: | Materials, Vol 14, Iss 6968, p 6968 (2021) Materials; Volume 14; Issue 22; Pages: 6968 Materials |
| Popis: | Modelling of elastomeric elements of railway components, able to represent stiffness and damping characteristics in a wide frequency range, is fundamental for simulating the train–track dynamic interaction, covering issues such as rail deflection as well as transmitted forces and higher frequency phenomena such as short pitch corrugation. In this paper, a modified non-linear Zener model is adopted to represent the dependences of stiffness and damping of the rail fastening, made of elastomeric material, of a reference Embedded Rail System (ERS) on the static preload and frequency of its deformation. In order to obtain a reliable model, a proper laboratory test set-up is built, considering sensitivity and frequency response issues. The equivalent stiffness and damping of the elastomeric element are experimentally characterised with force-controlled mono-harmonic tests at different frequencies and under various static preloads. The parameters of the non-linear Zener model are identified by the experimental equivalent stiffness and damping. The identified model correctly reproduces the frequency- and preload-dependent dynamic properties of the elastomeric material. The model is verified to be able to predict the dynamic behaviour of the elastomeric element through the comparison between the numerically simulated and the experimentally measured reaction force to a given deformation time history. Time domain simulations with the model of the reference ERS demonstrate that the modelled frequency- and preload-dependent stiffness and damping of the elastomeric material make a clear difference in the transient and steady-state response of the system when distant frequency contributions are involved. |
| Databáze: | OpenAIRE |
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