Optimization of acoustic measurement analysis for assessment of wheel/rail interaction force

Sie sind hier: Homepage > Suche

Optimization of acoustic measurement analysis for assessment of wheel/rail interaction force

Chartrain, Pierre-Emile / Bongini, Estelle / Mattei, Pierre-Olivier

The main source of noise from railway at conventional speeds Is the rolling noise. The wheel and the rail surfaces are not perfectly smooth, but contain small-amplitude irregularities called roughness. This roughness causes vibration of wheel and rail which both radiate noise. Within the LECAV project (LBCture Acoustique de la Voie, i.e. Acoustic reading of railway track), a method is developed to use the sound radiated by the wheel and the rail to characterize acoustics parameters of the wheel-track system during train running. These parameters will allow estimating rail roughness spectrum and potentially track decay rate. This method requires the knowledge of the acoustic radiation of the wheel and the rail in order to estimate the interaction force between the two elements in the contact zone. The first part of this paper is devoted to the post-processing method implemented on experimental measurements. This method has been validated with data obtained on a test train at standstill. The second part of the paper deals with the optimization of post-processing method. This method is established from a numerical and an analytical approach. The vibration and the acoustic radiation of the wheel are respectively calculated with the finite element method and an analytical formulation. This numerical approach widen the scope of the post-processing method which can thus be applied with different types of wheels. Then, results of the estimated excitation force from experimental and numerical post-processing are compared.