Open AccessFractal rigidity of the wheel-rail contact
Author(s) -
L. M. Babici,
Anca Tudor,
Jordi Romeu Garbí,
Marilena Stoica
Publication year - 2020
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/997/1/012002
Subject(s) - surface finish , rigidity (electromagnetism) , stiffness , vibration , fractal , materials science , surface roughness , structural engineering , contact mechanics , mechanics , geometry , composite material , engineering , physics , finite element method , mathematics , acoustics , mathematical analysis
One of the essential parameters of the roughness with effects on the vibration of the wheel and the rail is the contact stiffness. This rigidity considers the geometry and material of the wheel and rail, which are considered elastic. Also, the micro-geometry of the roughness and the load on the wheel, with elastic, elastoplastic and plastic deformations, depending on the deterministic or random character of the roughness were considered. The dependence of the stiffness on the deformation state of the roughness may explain the different amplitude of the vertical vibrations at the same force on the wheel and the same height of the roughness, but one roughness with different fractal parameters. For the analysis of the dynamic forces in contact, the continuous and underived analytical function that modelled the roughness measured experimentally on the rail was applied.