Air and ground transportation noise

Noise is perceived as the highest annoyance by EU citizens and noise induced stress, to which transportation noise is a major contributor, is the 2nd largest cause of pollution related diseases in Europe after air pollution, according to WHO. Therefore, sound levels both inside transportation systems and in the surrounding environment, must be considered already at the design stage: regulatory constraints are increasingly severe; acoustic and vibratory comfort is often a key for customer choices. Transportation noise has multiple origins: propulsion and engine systems, ventilation and air conditioning, unsteady flows around vehicles... This course deals with sound sources due to the different transport modes and their consequences on the perceived noise levels, both inside and outside the vehicle. To this end, methods for source diagnostics as well as popular measurement techniques required for noise level assesment and mitigation are tackled. A particular attention is paid to air transportation. Lectures related to air transportation are given by speakers from SAFRAN Aircraft Engines and a visit of large experimental facilities related to transportation noise illustrates the course content

•Transportation noise: General features, regulations and certification. •Noise sources in air transportation. Legislation and certification. (SAFRAN AE) •Noise reduction methods for air transportation noise. (SAFRAN AE) •An overview of ground transportation noise: sources and mitigation •Localisation and identification of sources. Advanced measurement techniques. •Analysis of structure-borne noise. Vibroacoustics. Statistical energy analysis (SEA). Basics of numerical vibroacoustics.