Spatial energy decay and indirect couplings in statistical energy analysis
2010 (English)Conference paper (Other academic)
Spatial energy decay within elements affects the validity of SEA. This is particularly significant for chains of similar long well-connected structures such as ventilation ducts, fluid-filled pipes and rib-stiffened plates found in ships, aircraft and railway cars. The effects of spatial energy decay on the high frequency response of one-dimensional well-connected elements are herein studied by comparing calculations by an SEA, a spectral finite element method and an SEA-like model. An SEA only includes direct coupling loss factors (CLFs); conversely, an SEA-like model also contains indirect CLFs. At high frequencies, the spatial energy decay increases and SEA overestimates the energies in all elements away from the excitation. Moreover, the indirect CLFs in the SEA-like model have to be considered when evaluating the energy flows, as the accumulated spatial decay from the excitation to the observed point increases. Thus, SEA cannot predict the high frequency response of similar long well-connected elements and alternative formulations are needed.
Place, publisher, year, edition, pages
2010. 2213-2227 p.
IdentifiersURN: urn:nbn:se:kth:diva-83534ISI: 000302905400164ScopusID: 2-s2.0-84951021626ISBN: 978-90-73802-87-2OAI: oai:DiVA.org:kth-83534DiVA: diva2:498809
International Conference on Noise and Vibration Engineering (ISMA)/Conference of USD Location: Leuven, BELGIUM Date: SEP 20-22, 2010
QC 201202162012-02-122012-02-122013-02-18Bibliographically approved