The University of Southampton
University of Southampton Institutional Repository

3D acoustic modelling of dissipative silencers with nonhomogeneous properties and mean flow

3D acoustic modelling of dissipative silencers with nonhomogeneous properties and mean flow
3D acoustic modelling of dissipative silencers with nonhomogeneous properties and mean flow
A finite element approach is proposed for the acoustic analysis of automotive silencers including a perforated duct with uniform axial mean flow and an outer chamber with heterogeneous absorbent material. This material can be characterized by means of its equivalent acoustic properties, considered coordinate-dependent via the introduction of a heterogeneous bulk density, and the corresponding material airflow resistivity variations. An approach has been implemented to solve the pressure wave equation for a nonmoving heterogeneous medium, associated with the problem of sound propagation in the outer chamber. On the other hand, the governing equation in the central duct has been solved in terms of the acoustic velocity potential considering the presence of a moving medium. The coupling between both regions and the corresponding acoustic fields has been carried out by means of a perforated duct and its acoustic impedance, adapted here to include absorbent material heterogeneities and mean flow effects simultaneously. It has been found that bulk density heterogeneities have a considerable influence on the silencer transmission loss.
1687-8132
Sánchez-Orgaz, E.M.
13a66172-8b1f-474f-a3e1-137da7e5536c
Denia, F.D.
5a64479b-10d6-482b-8f25-dc5b4ef39780
Martínez-Casas, J.
0dc0fd56-e99b-4fb3-a20d-029ef73b0fd7
Baeza, L.
09dc5565-ad4b-49af-a104-d4b6ad28e1b0
Sánchez-Orgaz, E.M.
13a66172-8b1f-474f-a3e1-137da7e5536c
Denia, F.D.
5a64479b-10d6-482b-8f25-dc5b4ef39780
Martínez-Casas, J.
0dc0fd56-e99b-4fb3-a20d-029ef73b0fd7
Baeza, L.
09dc5565-ad4b-49af-a104-d4b6ad28e1b0

Sánchez-Orgaz, E.M., Denia, F.D., Martínez-Casas, J. and Baeza, L. (2014) 3D acoustic modelling of dissipative silencers with nonhomogeneous properties and mean flow. Advances in Mechanical Engineering, 2014. (doi:10.1155/2014/537935).

Record type: Article

Abstract

A finite element approach is proposed for the acoustic analysis of automotive silencers including a perforated duct with uniform axial mean flow and an outer chamber with heterogeneous absorbent material. This material can be characterized by means of its equivalent acoustic properties, considered coordinate-dependent via the introduction of a heterogeneous bulk density, and the corresponding material airflow resistivity variations. An approach has been implemented to solve the pressure wave equation for a nonmoving heterogeneous medium, associated with the problem of sound propagation in the outer chamber. On the other hand, the governing equation in the central duct has been solved in terms of the acoustic velocity potential considering the presence of a moving medium. The coupling between both regions and the corresponding acoustic fields has been carried out by means of a perforated duct and its acoustic impedance, adapted here to include absorbent material heterogeneities and mean flow effects simultaneously. It has been found that bulk density heterogeneities have a considerable influence on the silencer transmission loss.

Full text not available from this repository.

More information

Published date: 2014
Additional Information: cited By 3
Organisations: Dynamics Group

Identifiers

Local EPrints ID: 411224
URI: https://eprints.soton.ac.uk/id/eprint/411224
ISSN: 1687-8132
PURE UUID: a738bd00-1aab-4629-9d5b-f868b84a251d
ORCID for L. Baeza: ORCID iD orcid.org/0000-0002-3815-8706

Catalogue record

Date deposited: 15 Jun 2017 16:32
Last modified: 10 Sep 2019 00:27

Export record

Altmetrics

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of https://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×