Influence of structural damping on sound radiation from a point-excited beam
2007 (English)In: Turkish Acoustical Society - 36th International Congress and Exhibition on Noise Control Engineering, INTER-NOISE 2007 ISTANBUL, 2007, 967-975 p.Conference paper (Refereed)
The track is the main noise source of a railway when the frequency is below about 1250 Hz. Quite a few efforts have been made to increase the attenuation of the railway track in order to reduce the radiated sound. The attempt of this paper is to investigate the influence of the structural damping on the sound pressure level at the area close to the excitation point instead of the total radiated sound power. For this purpose, the simplest model, i.e. an infinite beam, is adapted. Both near field solution and the propagating wave are included. Results show that when the sound pressure levels at a certain areas close to the excitation is concerned only, the influence of the structural damping is somewhat lower than what expected on the total sound power, partly due to the contribution of the near field solution and partly due to the wave propagation. If the area concerned is small, this influence is also dependent on frequency, because of the length of the bending wave. It is difficult to estimate the influence of the structural damping on wayside noise from laboratory tests with a short track and a point excitation.
Place, publisher, year, edition, pages
2007. 967-975 p.
Acoustic variables measurement, Acoustic wave transmission, Damping, Exhibitions, Fire alarm systems, Wave propagation
Fluid Mechanics and Acoustics
IdentifiersURN: urn:nbn:se:kth:diva-59536ScopusID: 2-s2.0-84873950879ISBN: 978-160560385-8OAI: oai:DiVA.org:kth-59536DiVA: diva2:475645
36th International Congress and Exhibition on Noise Control Engineering, INTER-NOISE 2007; Istanbul; Turkey; 28 August 2007 through 31 August 2007
QC 201201112012-01-112012-01-112014-10-28Bibliographically approved