Concept for measuring aeroacoustic noise transmission

Kurzfassung

Cost-saving is an important factor in the transport sector. This includes production/acquisition and total lifecycle costs. Low energy consumption is one of the areas of cost-saving. Especially the usage of new materials and lightweight constructions is an interesting issue to reduce the energy consumption of trains. However, new construction concepts do need new acoustical concepts to preserve and/or improve the passenger comfort. To improve the understanding of the acoustic behaviour of trains, measurements are an essential issue. On the one hand measurements provide direct knowledge of the transferred acoustical energy and on the other the measured data is used to validate numerical simulations to get accurate and reliable results in the future. Various sources and source mechanisms play their part in the overall acoustical performance of trains. In the high-speed sector aeroacoustic source excitation is one of the most important sources. Nowadays exterior aeroacoustic noise can be measured in wind tunnels (scaled models). But for the measurement of the transmission from aeroacoustic noise sources into the passenger cabin, in-situ measurement techniques are needed. This concept for measuring aeroacoustic noise transmission will show how to determine the source, the response of the carriage and the noise radiation into the cabin. It has already been used on a DLR flight-test campaign and can be applied on high-speed trains, as well.