Determination of Insertion Losses for Vibration Mitigation Measures in Track by Artificial Vibration Excitation
This paper describes free-field tests carried out to test a procedure for the investigation of vibration mitigation measures. The test procedure consists of (1) train passing measurements, (2) measurement of the subsoil transfer-mobility by impact tests and (3) vibration measurement with an artificial, force-controlled excitation by means of a newly-developed force-controlled harmonic shaker including the procedure to simulate the sprung and un-sprung masses of trains.
It is shown that the mitigation effect based on the dynamic spring-mass effect of vibration isolation for resilient elements can be well described by this method. This component of mitigation effect can also be verified by means of the artificial excitation.
On the other hand, the results of the train pass-by measurements show additional reduction potential of under-sleeper pads (USP) due to the mechanical effect of a homogenized track stiffness.
KeywordsInsertion Loss Ground Vibration Mitigation Effect Vibration Velocity Freight Train
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