Improved Methods for the Separation of Track and Wheel Noise Components During a Train Pass-By

Experimental techniques are described that aim to allow the wheel and track components of rolling noise to be separated from pass-by measurements. These are based on Advanced Transfer Path Analysis, Pass-by Analysis, and a method based on the TWINS model. Improvements to these methods and their experimental validation using field tests are described. Initial comparisons are made for two test cases, a metro train running at 60 km/h and a regional train running at 80 km/h. The three methods agree reasonably well in terms of overall trends. The largest differences are found at low frequencies where the two experimental methods give similar levels for sleeper and rail vertical components whereas the TWINS model gives a larger distinction between them.