Validation of finite element computations for the quantitative prediction of underwater noise from impact pile driving

The acoustic radiation from a pile being driven into the sediment by a sequence of hammer strikes is studied with a linear, axisymmetric, structural acoustic frequency domain finite element model. Each hammer strike results in an impulsive sound that is emitted from the pile and then propagated in the shallow water waveguide. Measurements from...

Brake noise measurements on mixed freight trains with composite brake blocks

Brake noise is known to be a major contributor to the total sound emission of railway yards and areas near stations. It has been established that composite brake blocks reduce rolling noise, but it is not known if this is also the case for braking noise. Therefore, in order to investigate this, noise measurements were conducted on mixed freight...

Noise reduction of freight wagons achieved by LL-blocks implementation: Last investigations and results from IPG and NICOBB projects