Abstract
Rail is an important source of noise in the railway traffic and its acoustic power is depending on the rate of decay of vibration. The main characteristic of the track in terms of the vertical elasticity is the so-called track modulus which results from the load-rail deflection curve. In general, this curve is nonlinear and it can be approximated using piecewise linear function with bilinear characteristic. In this paper, the response of a beam on elastic foundation with bilinear characteristic due to constant and harmonic loads is investigated, pointing out the impact of the foundation characteristic on the rail response and the propagation of the bending waves along the track.
Highlights
The elastic characteristics of the wheels can influence the ride comfort of railway vehicles [1], the wheel-track dynamic loads [2, 3] and the rolling noise emissions, with adverse effects on passengers and residents living or working in buildings located in the vicinity of the track [4]
The track modulus is the most important elastic characteristic of the track; the experiments shown that it has a non-linear variation with the wheel load [5, 6]
The influence of the bilinear characteristic of the track on the decay rate of the vertical vibrations along the track is studied in this paper, using a continuous model with two elastic layers
Summary
The elastic characteristics of the wheels can influence the ride comfort of railway vehicles [1], the wheel-track dynamic loads [2, 3] and the rolling noise emissions, with adverse effects on passengers and residents living or working in buildings located in the vicinity of the track [4]. The track modulus is the most important elastic characteristic of the track; the experiments shown that it has a non-linear variation with the wheel load [5, 6]. The influence of the bilinear characteristic of the track on the decay rate of the vertical vibrations along the track is studied in this paper, using a continuous model with two elastic layers. [7] where only one elastic layer accounted for Similar approach can be found in ref. [7] where only one elastic layer accounted for
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