Mathematical Sciences Research Centre Seminar Series

The method of superposition for near-field acoustic holography in a semi-anechoic chamber

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Seminars

As part of the School of Science and Technology Mathematical Sciences Research Centre Seminar Series, Nadia Abusag, NTU presents: The method of superposition for near-field acoustic holography in a semi-anechoic chamber

  • From: Wednesday 2 May 2018, 1 pm
  • To: Wednesday 2 May 2018, 2 pm
  • Location: 169, New Hall Block, Nottingham Trent University, Clifton Campus, Clifton Lane, Nottingham, NG11 8NS

Past event

Event details

As part of the School of Science and Technology Mathematical Sciences Research Centre Seminar Series, Nadia Abusag, NTU presents: The method of superposition for near-field acoustic holography in a semi-anechoic chamber

Abstract

Near-field Acoustic Holography (NAH) is the process of reconstructing the vibrational behaviour of a structure from measurements of the acoustic field generated by these vibrations. Traditionally NAH was applied to planar regions where Fourier methods can be used to reconstruct the structural vibrations, even at frequencies beyond the sampling resolution limit. The Method of Superposition (MoS) is a relatively simple method for reconstructing the vibrational properties of structures with more general geometries. Recent work has shown that the MoS can also be effectively combined with sparse l1 regularisation to generate solutions from only a small number of terms in the superposition. In this work we discuss a reformulation of the MoS for NAH experiments in a semi-anechoic chamber; experiments in fully anechoic chambers can often prove impractical. In particular, we propose a modified Green's function approach for a semi-infinite domain with a hard reflecting boundary using the Method of Images and present the results of some supporting numerical experiments, including reconstructions using data from a series of experiments performed at the University of Salford’s Acoustics Research Centre.

All welcome.

This seminar is hosted by Dr David Chappell.

For any enquiries please contact Dr David Chappell.

Location details

Room/Building:

169, New Hall Block

Address:

Nottingham Trent University
Clifton Campus
Clifton Lane
Nottingham
NG11 8NS

Past event

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