Impact of Speed and Throttle Adjustments on FTA Noise Model in Transit Rail Analysis Including Case Study
AbstractThe US Federal Transit Authority (FTA) Detailed Noise Modelling method for diesel-electric locomotive passenger trains has become a common method used to determine the noise impact from transit rail sources. The FTA model uses equations that determine noise emissions as a function of speed and train consist. This study considers the relationship between sound emission and speed based on specific train consists and throttle settings to show that, in many situations, using the FTA method to model trains at a higher speed does not result in a higher noise emission compared to trains travelling at slower speed. This is particularly significant around stations where trains decelerate and accelerate at varying throttle settings. The investigation concludes with a case study which evaluates the potential sound levels resulting from transit rail activity at the façade of a proposed noise sensitive building with a view to establishing a reasonable worst-case set of parameters for the modelling.
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