In structural dynamics it is common practice to model a road, runway, or railway track as a beam structure. Typically, a Kelvin-type foundation is used to describe an underlying material, and traffic is modeled as moving loads. Many papers deal with a deterministic analysis of the problem. However, in reality the parameters of the track structure as well as the loads are usually random variables. Thus a stochastic analysis of the problem has a significant interest, not only from an academic but also from a practical point of view. The paper deals with the stochastic analysis of a single-degree-of-freedom vehicle moving at a constant velocity along an infinite Bernoulli-Euler beam with surface irregularities supported by a Kelvin foundation. Both the Bernoulli-Euler beam and the Kelvin foundation are assumed to be constant and deterministic. This also applies to the mass, spring stiffness, and damping coefficient of the vehicle. At first the equations of motion for the vehicle and beam are formulated in a coordinate system following the vehicle. The frequency response functions for the displacement of the vehicle and beam are determined for harmonically varying surface irregularities. Next, the surface irregularities are modeled as a random process. The variance response of the mass of the vehicle as well as the displacement variance of the beam under the oscillator are determined in terms of the autospectrum of the surface irregularities.
Vehicle moving along an infinite beam with random surface irregularities on a Kelvin foundation
Ein auf einem infiniten Träger mit zufälligen Oberflächenirregularitäten auf einer Kelvin-Gründung sich bewegendes Fahrzeug
Transactions of the ASME, Journal of Applied Mechanics ; 69 , 1 ; 69-75
2002
7 Seiten, 5 Bilder, 17 Quellen
Article (Journal)
English
Locomotive response to random track surface irregularities
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