Influence of structural damping on radiation efficiency of a mechanically or acoustically excited panel
2006 (English)Conference paper (Refereed)
Previous investigations have shown that damping is a good way to reduce structural vibration, but less effective for sound problems, since the radiation efficiency might be increased dramatically. This problem is further investigated in this paper. Results show that when a constrained damping layer is applied and when mechanical excitation is used, the radiation efficiency is increased by about 9-12 dB. This is mainly due to the near-field radiation around the excitation point, which is more important for a heavily damped structure than for a structure with little damping. The radiation efficiency of an acoustically excited panel, which is directly related to sound transmission, is also increased by about 6-9 dB when damping is added. Instead of radiation from near-field, forced transmission is now the main reason. Although resonant modes, which are the main contributors for vibration, are reduced greatly by added damping, the responses far away from the resonant frequency are little influenced, which are the main contributors for sound radiation and transmission.
Place, publisher, year, edition, pages
IdentifiersURN: urn:nbn:se:kth:diva-59541ScopusID: 2-s2.0-84883441571ISBN: 978-162748150-2OAI: oai:DiVA.org:kth-59541DiVA: diva2:475681
ICSV13, the Thirteenth International Congress on Sound and Vibration. Vienna, Austria. July 2-6, 2006
QC 201411042012-01-112012-01-112014-11-04Bibliographically approved