Wave motion and sound transmission loss of double walls filled with porous materials
2012 (English)In: Proceedings Of International Conference On Noise And Vibration Engineering (ISMA2012) / International Conference On Uncertainty In Structural Dynamics (USD2012), 2012, 1803-1814 p.Conference paper (Refereed)
A novel semi-analytical approach is presented and employed to calculate the sound transmission loss (STL) of a double wall lined with porous materials. The approach consists of using the waveguide finite element method (WFEM) together with a Rayleigh-Ritz procedure. The former is a convenient semi-analytical approach useful for structures having constant properties along one direction. The Rayleigh-Ritz procedure assumes that the structure satisfies convenient boundary conditions, so that its response can be described by a trigonometric Fourier series. The advantage of the procedure compared to full FE models, and spectral element models, is that it evaluates several orders of magnitude quicker and can describe frequency dependent materials at virtually no cost. In addition, the WFEM readily provides the dispersion curves of the structure, which reveal its physics. Calculations of the STL are favourably compared to measurements.
Place, publisher, year, edition, pages
2012. 1803-1814 p.
Acoustic-Impedance Model, Finite-Element-Method, Poroelastic Materials, Part 1, Formulation, Systems, Guides
IdentifiersURN: urn:nbn:se:kth:diva-125798ISI: 000321063901072ScopusID: 2-s2.0-84906352991ISBN: 978-90-73802-89-6OAI: oai:DiVA.org:kth-125798DiVA: diva2:640986
International Conference on Noise and Vibration Engineering (ISMA) / International Conference on Uncertainty in Structural Dynamics (USD), KU Leuven, Dept Mech Engn, Leuven, Belgium, SEP 17-19, 2012
QC 201308152013-08-152013-08-132013-08-15Bibliographically approved