Sound transmission through a high-speed train roof
2011 (English)In: 18th International Congress on Sound and Vibration 2011, ICSV 2011, 2011, 2392-2399 p.Conference paper (Refereed)
Low internal noise in train carriages is of great importance to the comfort of the passengers, and accordingly also for train manufacturers and operators who want to keep a comfort advantage in relation to other means of transportation. With increased speed the aerodynamic noise becomes an important contributor. Here a train roof section is studied containing a recess where a pantograph is mounted. Significant excitation is present both from aerodynamic forces directly acting on the roof as well as forces transmitted via the pantograph structure and the power input to the compartment is studied for speeds up to 350 km/h. The train roof was modeled using a hybrid FE-SEA approach with input excitation data from transient and compressible CFD calculations as well as from measured structural forces from a full scale wind tunnel test. For reference, turbulent boundary layer (TBL) excitation was studied using a Corcos model. For the transmission model the outer roof structure is described by FE whereas the interior parts are represented by statistical subsystems. Experimental validation of the approach was made on an existing train. The result indicates that for the configuration and sources analysed the contributions to the interior noise from all three sources analysed are significant. Ranking of transmission paths into the train interior and perspectives for application of such models for parametric studies of design parameters are discussed.
Place, publisher, year, edition, pages
2011. 2392-2399 p.
A-train, Aerodynamic forces, Aerodynamic noise, Corcos model, Design parameters, Experimental validations, Full scale, High speed trains, Interior noise, Internal noise, Parametric study, Power input, Roof section, Roof structures, Sound transmission, Structural forces, Train carriage, Train interiors, Transmission model, Transmission paths, Turbulent boundary layers, Wind tunnel tests, Acoustic noise, Aerodynamics, Automobile manufacture, Pantographs, Roofs
IdentifiersURN: urn:nbn:se:kth:diva-148701ScopusID: 2-s2.0-84871514229ISBN: 9781618392596OAI: oai:DiVA.org:kth-148701DiVA: diva2:746296
18th International Congress on Sound and Vibration 2011, ICSV 2011, 10 July 2011 through 14 July 2011, Rio de Janeiro, Brazil
QC 201409122014-09-122014-08-112014-09-12Bibliographically approved