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Response of an infinite beam on a locally inhomogeneous viscoelastic foundation interacting with a moving oscillator – The Green’s Function Approach. / Mazilu, Traian; Faragau, Andrei; Metrikine, Andrei; van Dalen, Karel.

2019. 297-298 Abstract from First International Nonlinear Dynamics Conference, Rome, Italy.

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@conference{7bc1a4933d5549bd90fec3319625a9d8,
title = "Response of an infinite beam on a locally inhomogeneous viscoelastic foundation interacting with a moving oscillator – The Green’s Function Approach",
abstract = "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.",
author = "Traian Mazilu and Andrei Faragau and Andrei Metrikine and {van Dalen}, Karel",
note = "Accepted Author Manuscript; First International Nonlinear Dynamics Conference, NODYCON 2019 ; Conference date: 17-02-2019 Through 20-02-2019",
year = "2019",
language = "English",
pages = "297--298",

}

RIS

TY - CONF

T1 - Response of an infinite beam on a locally inhomogeneous viscoelastic foundation interacting with a moving oscillator – The Green’s Function Approach

AU - Mazilu, Traian

AU - Faragau, Andrei

AU - Metrikine, Andrei

AU - van Dalen, Karel

N1 - Accepted Author Manuscript

PY - 2019

Y1 - 2019

N2 - 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.

AB - 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.

M3 - Abstract

SP - 297

EP - 298

ER -

ID: 57038495