Open AccessThe vibration behaviour of a freight wagon in the presence of irregularities of the track
Author(s) -
Traian Mazilu,
V. M. Dinu
Publication year - 2019
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/682/1/012007
Subject(s) - vibration , damper , suspension (topology) , acceleration , track (disk drive) , structural engineering , dry friction , engineering , contact force , tuned mass damper , automotive engineering , mechanics , physics , materials science , mechanical engineering , acoustics , classical mechanics , mathematics , composite material , homotopy , pure mathematics
The paper presents an analysis of the behaviour of the vertical vibration of a freight wagon featured with dry friction dampers in suspension. To this end, the wagon model is reduced to an oscillator with two degrees of freedom corresponding to the suspended mass of the wagon and the wheel. The suspension has progressive characteristic in two steps according to the empty/loaded state. Coulomb’s model is considered to model the dry friction damper. The vibration is induced by the track irregularity which is synthetized from an analytic spectrum. Vibration behaviour exhibits two different aspects: at low speed, the suspension is locked, and at high speed, the stick-slip vibration occurs. Acceleration of the suspended mass of the wagon and wheel-rail contact force increase along the speed. Wagon loaded state influences the wheel-rail contact force, but it has no impact upon the acceleration.