New approaches for design and experimental analysis of damping ring and its influence on railway wheel dynamics

0510197 - ÚT 2020 GR eng C - Conference Paper (international conference)
Pešek, Luděk - Půst, Ladislav - Bula, Vítězslav - Šnábl, Pavel - Boháč, T. - Tašek, H.
New approaches for design and experimental analysis of damping ring and its influence on railway wheel dynamics.
ICOVP 2019. Atény: National Technical University of Athens, 2019 - (Sapountzakis, E.), s. 1-13
[ICOVP 2019. Kréta (GR), 01.09.2019-04.09.2019]
Institutional support: RVO:61388998
Keywords : railway wheel * rolling noise * curve squeal noise * damping ring
OECD category: Applied mechanics

This paper deals with optimization of BONASILENCE damping ring inserted into a groove on a monoblock railway wheel to suppress radial and axial mode shapes of vibrations that cause rolling and curve squeal noise. A free open-ended damping ring has slightly larger diameter than the groove and, when inserted, pre-stress of the ring is assured. However, when the circular ring of larger diameter is inserted into smaller circular groove the deformation of the ring causes that the ring and groove are not in contact along all the circumference. Therefore, a non-circular shape of the free damping ring modelled by beam theory for providing even pressure distribution between the ring and groove along the entire circumference is under development. For evaluation ofthe damping ring effect on different circumferential pre-stresses a new approach of measurement of slip between the ring and the groove based on optical correlation method was used. Patches of speckle images with stochastic structure were generated and glued on the ring and the rim on their boundary at the places of presumed maximal wheel vibration. Vibration of the wheel was then excited, and the area of speckle images was recorded by high-speed camera. Then the local relative motion between the ring and the wheel which is in the range up micrometers and up to 2kHz of vibration frequency was evaluated. This method can be used for the finding of optimal setting of the pre-stresses in the
damping ring to achieve the maximal damping.
Permanent Link: http://hdl.handle.net/11104/0302583