A multidimensional analytical study of sound attenuation in catalytic converters

Publication Type:
Conference Proceeding
Citation:
39th International Congress on Noise Control Engineering 2010, INTER-NOISE 2010, 2010, 6 pp. 4977 - 4986
Issue Date:
2010-12-01
Full metadata record
Files in This Item:
Filename Description Size
A_multidimensional_analytical_study_of_sound_atten.pdfPublished version491.35 kB
Adobe PDF
In this work, a multidimensional analytical model is presented for the sound attenuation assessment of axisymmetric catalytic converters. Bessel functions are considered for the circular ducts, while spherical Hankel and Legendre functions are used for the expansion/contraction tapered ducts. Two alternative modelling techniques are implemented and compared for the monolith: (1) An equivalent bulk reacting absorbent material, in which the wave propagation is determined by the effective complex and frequency dependent density and speed of sound; (2) A coupling approach between both sides of the ceramic monolith in which a plane wave transfer matrix is considered, therefore retaining only onedimensional propagation within the capillary ducts. Benchmarking of the developed analytical techniques with finite element calculations shows good agreement. The influence of several parameters on the sound attenuation of the catalyst is investigated.
Please use this identifier to cite or link to this item: