Workshop

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15th CEAS-ASC Workshop and 1st Scientific Workshop of X-Noise EV

DateOctober 13, 2011 - 8a.m. / October 14, 2011 - 6p.m.
AddressEcole Polytechnique Fédérale de Lausanne Polydôme, 1015 Lausanne, Switzerland

Acoustic Liners and Associated Propagation Techniques

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Attenuation of engine noise by acoustic liners in turbofan ducts remains one of the most effective methods of achieving aircraft noise reduction. Acoustic liners are routinely installed in the intake, bypass and inter-stage regions of turbofan engines to reduce fan noise, and in the hot stream exhaust ducts to mitigate turbine and combustion noise. Their presence attenuates selectively the acoustic modes excited by these sources and redistributes the transmitted acoustic energy in the far field. Predicting far field EPNL in the presence of liners demands the use of analytic, numerical or data-based prediction models to account for the effects of lined surfaces and geometry changes in the ducted sections of the engine as the sound propagates to the far field.

Contributions are invited to the above workshop which touch on all aspects of liner modelling, liner impedance prediction, in situ liner performance and propagation methods. In particular, submissions are invited in the following areas:

  1. Novel liner concepts, passive and adaptive.
  2. Measurement of liner impedance, techniques and applications.
  3. Analytic, numerical and empirical methods for predicting liner impedance.
  4. Analytic, numerical and empirical methods for predicting the effect of liners on far field sound pressure.
  5. Optimisation of liners to reduce community and/or interior noise.

The language of the workshop will be English. The interested speakers are invited to submit their abstracts on no more than 2 pages including authors’names and affiliations, in electronic form (.pdf or .doc).

The speakers must provide their manuscript or their presentation in advance in electronic form (PDF or Power Point) so as to facilitate the preparation of the proceedings.

To submit an abstract (2 pages max. in .doc or .pdf format), please click on one of the following link:

  1. Novel liner concepts, passive and adaptive..
  2. Measurement of liner impedance, techniques and applications.
  3. Analytic, numerical and empirical methods for predicting liner impedance.
  4. Analytic, numerical and empirical methods for predicting the effect of liners on far field sound pressure.
  5. Optimisation of liners to reduce community and/or interior noise.
  6. Other subjects.

KEY DATES:

  • 19 June 2011: Submission of abstracts
  • 17 July 2011: Notification of acceptance
  • 14 August 2011: Advance registration

PUBLICATIONS:

After the workshop, appropriate presentations will be recommended for submission to International Journal of Aeroacoustics (IJA)

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Hervé Lissek
Laboratoire d'Electromagnetisme et d'Acoustique

EPFL STI IEL LEMA
Station 11
CH-1015 Lausanne
Switzerland

T +41 21 693 46 30
F +41 21 693 26 73

herve . lissek .@. epfl . ch
http://lema.epfl.ch

The access to this content is restricted to authenticated user.

The access to this content is restricted to authenticated user.

Posted by Hervé LISSEK on May 4, 2011