MEASUREMENT AND ANALYSIS OF TRAIN NOISE DETECTED ON A BUILDING FAÇADE.

Noise produced by the transit of a train is affected by many variables: wheel-railcontact, engine, aerodynamic noise, random events, etc.. Some of these components,such as wheel-rail contact and aerodynamic noise are strongly dependent on highvelocity, while other components, such as noise due to engines and auxiliary devices,are relevant in a low velocity regime, especially in proximity of a railway station, in theapproaching and leaving phases.In this paper we describe both an experimental activity regarding the measurements ofnoise produced by low velocity trains and detected on a building façade, close to arailway station at night time, and a semi-quantitative theoretical model which gives theprincipal shapes of freight trains in various dynamical situations.At this stage of the study, we focus on different types of trains and of runningconditions, evaluating their influence on the time history by means of comparisonsbetween software predictions and experimental measurements. The experimentalmethod chosen rely upon the simultaneous detection of the acoustic signals detectedby two receivers placed some 30 meters apart and linked to the channels of a class 1Measuring System.