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Determination of dynamic amplification factors for heavy haul railways
- Source :
- Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit. 232:514-528
- Publication Year :
- 2016
- Publisher :
- SAGE Publications, 2016.
-
Abstract
- A new approach has been developed to determine the dynamic amplification factors of railways. This approach employs a traditional multi-body dynamic model of vehicle–track interaction and a 3D explicit finite element model of wheel–rail rolling contact to treat the low- and high-frequency dynamics, respectively. Excitations are considered by contact surface unevenness and more specifically, by the power spectrum density of track irregularity for the low-frequency analysis and by the critical wheel flat, weld, and rail corrugation for the high frequency. For the 40-tonne axle load heavy haul railway simulated in this work, it has been found that the optimum fastening stiffness should be 150–200 MN/m; the dynamic amplification factors of the wheel–rail contact, fastening, and ballast forces are 1.94, 2.0, and 1.67, respectively, if the fastening stiffness of 200 MN/m is applied. Finally, new dynamic amplification factor formulae that include key parameters such as the fastening stiffness, speed, and axle load are proposed for the heavy haul railway design.
- Subjects :
- Ballast
Engineering
business.industry
Mechanical Engineering
Spectral density
Stiffness
020302 automobile design & engineering
02 engineering and technology
Structural engineering
Structural dynamics
Finite element method
Axle
020303 mechanical engineering & transports
0203 mechanical engineering
Deflection (engineering)
medicine
Axle load
medicine.symptom
business
Subjects
Details
- ISSN :
- 20413017 and 09544097
- Volume :
- 232
- Database :
- OpenAIRE
- Journal :
- Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit
- Accession number :
- edsair.doi...........cfcc232ec11c771693af519d54a39bf1