Track Noise Reduction - A single value descriptor of noise radiated by a railway track based on Track Decay Rate
* Presenting author
One of the outcomes of the STARDAMP project was a laboratory testing method for rail dampers based on flexibly mounted rail sections. To achieve an estimate of the performance of the tested rail dampers in the track it is necessary to combine the damping effectiveness of the damper from the laboratory with the existing damping of the track expressed in terms of the Track Decay Rate (TDR). By combining both data sets the reduction of the noise radiated by the track can be determined. To summarise the effect of a rail damper in a particular situation, a reduced calculation procedure has been developed, presenting the acoustic differences of track sections as a single value. This value gives the Track Noise level Reduction (TNR) due to the changes in TDR. This calculation method may now be used to give a better understanding of the noise levels at different railway track sites in the same way as the roughness level.This paper will give a short overview of the calculation method and its sphere of influence to compare the noise radiation at different track sites with the aim of introducing a single value descriptor for the effect of TDR.