Acoustic Performance of Some Lined Dissipative Silencers

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Innovations in Mechanical Engineering (icieng 2021)

Abstract

Heating ventilating and air-conditioning systems which equip our buildings/rooms represent noise sources unfavorable affecting the people decent living and working conditions. Usually, silencers are used to reduce the annoying sound from these systems. They are lined with different materials and they have various geometries in order to satisfy the consumer needs, in terms of acoustic comfort. Sound absorption and sound transmission loss characterize the materials acoustic properties, but it is not mandatory that a good absorbent material to be also an efficient one from transmission loss (attenuation) point of view. Our paper is focused on an acoustic study of different materials lining three commercial silencers of same geometry and size. We have recorded the sound data according to standards: ISO 10534-1:1998 for the sound absorption coefficient and ISO 7235:2009 for the transmission loss rating. Third octave analysis with LabView soft is used to process the sound information and then the two parameters values are calculated. The acoustic characteristics of the tested materials are discussed and features that recommend them to be used as lining materials for silencers are highlighted.

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Correspondence to Carmen Bujoreanu .

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Benchea, M., Bujoreanu, C., Ianus, G. (2022). Acoustic Performance of Some Lined Dissipative Silencers. In: Machado, J., Soares, F., Trojanowska, J., Ottaviano, E. (eds) Innovations in Mechanical Engineering. icieng 2021. Lecture Notes in Mechanical Engineering. Springer, Cham. https://doi.org/10.1007/978-3-030-79165-0_29

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  • DOI: https://doi.org/10.1007/978-3-030-79165-0_29

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  • Publisher Name: Springer, Cham

  • Print ISBN: 978-3-030-79164-3

  • Online ISBN: 978-3-030-79165-0

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