Transition zones in railway tracks require a high maintenance frequency which leads to high costs and delays. To better understand the underlying mechanisms, a one-dimensional model is used, consisting of an infinite Euler-Bernoulli beam resting on locally inhomogeneous viscoelastic Winkler foundation subjected to a moving oscillator. The governing equation is solved by means of the time-domain Green’s function method using convolution integrals in terms of the unknown contact force. To this end, the Green’s functions of the beam-foundation sub-system and of the oscillator are computed independently. They are combined through the nonlinear contact relation. The sources of nonlinearity are: the Hertzian contact relation and the possibility of contact loss between the oscillator and the beam. Results show that the contact force in the transition zone can reach 3-6 times the steady-state one. In some cases, the contact loss occurs at the oscillator velocity of around 75% of the critical velocity in the structure. The model can be used for preliminary design of transition zones in railway tracks, for preliminary predictions of a structure’s remaining life time and for fatigue predictions of a train’s wheelset.
Original languageEnglish
Pages297-298
Number of pages2
Publication statusPublished - 2019
EventFirst International Nonlinear Dynamics Conference - Rome, Italy
Duration: 17 Feb 201920 Feb 2019

Conference

ConferenceFirst International Nonlinear Dynamics Conference
Abbreviated titleNODYCON 2019
CountryItaly
CityRome
Period17/02/1920/02/19

ID: 57038495