2015
DOI: 10.1016/j.finel.2015.04.004
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Finite element based acoustic analysis of dissipative silencers with high temperature and thermal-induced heterogeneity

Abstract: A mixed finite element model has been derived for the acoustic analysis of perforated dissipative silencers including several effects simultaneously: (1) High temperature and thermal gradients in the central duct and the outer absorbent material; (2) A perforated passage carrying non-uniform axial mean flow. For such a combination, the properties of sound propagation media and flow are inhomogeneous and vary with position. The material of the outer chamber can be modelled by its complex equivalent acoustic pro… Show more

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Cited by 19 publications
(50 citation statements)
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References 39 publications
(96 reference statements)
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“…The physical and chemical properties of various materials and their relative durability in simulated automotive silencer operations are described by Huff [88]. Despite the improvements of the material properties and the increasing interest not only in reducing the noise levels under the legal limits, but also in the sound quality, having promoted use of the absorbent materials as a part of the silencers over recent decades [47,65,100,138,155,159,160], recent studies [5,8,64,182] have raised an interesting trend that promotes the search of less polluting alternatives.…”
Section: Absorbent Materialsmentioning
confidence: 99%
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“…The physical and chemical properties of various materials and their relative durability in simulated automotive silencer operations are described by Huff [88]. Despite the improvements of the material properties and the increasing interest not only in reducing the noise levels under the legal limits, but also in the sound quality, having promoted use of the absorbent materials as a part of the silencers over recent decades [47,65,100,138,155,159,160], recent studies [5,8,64,182] have raised an interesting trend that promotes the search of less polluting alternatives.…”
Section: Absorbent Materialsmentioning
confidence: 99%
“…The wavenumber k m and the characteristic impedance Z m of the equivalent fluid are also complex [10,57,134]. This model can be used for a number of fibrous materials used by industry in the manufacturing process of silencers [65,138,149,155,156,180]. The second model, also known as the poroelastic approach, is based on Biot's theories [32,33] and was adapted by Allard et al [11] to the acoustic problem.…”
Section: Materials Characterizationmentioning
confidence: 99%
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