Exhaust noise control case study for 2800 class locomotive
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In NSW, Environment Protection Authority Licences for railway systems activities define noise limits for locomotives applying for permission to operate on the network. This paper describes a case study involving one particular locomotive class (the 2800 class) that had been refused permission to operate in NSW on the basis of low-frequency noise emissions. This paper describes investigations into the locomotive noise and muffler performance, and the steps taken to re-design the muffler to optimise its performance. The objective was to reduce low frequency noise emissions to comply with the EPA licence requirements. The project achieved a reduction in overall Lmax noise levels of up to 5 dB in the highest engine notch settings. The low frequency benefit (in the 25 Hz and 50 Hz one-third octave frequency bands) was of the order of 8 dB. The locomotive class has subsequently been granted approval to operate in NSW.
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