The Acoustics Division has developed a large number of tried and tested simulation models and these are supplemented by sophisticated measuring procedures and arrangements that optimise the noise reduction solutions. We have developed a simulation program that is able to calculate the acoustic effect of solutions for existing bridges. This program is also used to determine the optimum geometry for new bridges. Traction noise Our specific knowledge covers noise reduction for electrical traction and power converters as well as the area of noise from combustion engines and exhaust systems. Software demonstration of train noise We have developed a multimedia demo that allows the effects of parameter changes to be made both visible and audible.
Examples are the speed of the train or the stiffness of the rail pads.
Development of quiet carriages and optimisation of shielding devices We have developed a reciprocal measuring method and a scale model facility that allows fast and effective evaluation of design changes in terms of noise reduction. This can be done on a stationary vehicle. We also have a calculation model that can calculate the effect of barriers placed at normal distances. We also have noise propagation models which are able to determine the noise contours around infrastructures. Development of measurement systems TNO has full capability to develop dedicated measurement systems.