Accuracy, and the prediction of ground vibration from underground railways

This paper demonstrates the capability of a new and freely-available PiP software for calculating vibration from railway tunnels. PiP is used to examine the sources of uncertainly in models used to predict vibration from underground railways. By varying slightly the parameters of the model, consistent with uncertainties in measured data, the vibration levels predicted by the model vary significantly, often by 10dB or more. This error is hard to predict so it cannot be good practice to rely on prediction models for accuracy better than 10dB. The presentation will demonstrate the PiP model in real time.