Tracking vibrational energy on curved shell structures of variable thickness in the mid-to-high frequency - a ray tracing approach

Crofts, J.J. ORCID: 0000-0001-7751-9984, Søndergaard, N. and Chappell, D.J. ORCID: 0000-0001-5819-0271, 2016. Tracking vibrational energy on curved shell structures of variable thickness in the mid-to-high frequency - a ray tracing approach. In: International Conference on Noise and Vibration Engineering (ISMA 2016), Leuven, Belgium, 19-21 September 2016. (Forthcoming)

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Abstract

Modelling the vibro-acoustic properties of mechanical built-up structures is a challenging task. Commonly employed techniques, such as finite element methods, are robust only in the low frequency regime. Recently, Discrete Flow Mapping has been forwarded as a cost efficient alternative method for mid- to high-frequency vibro-acoustic modelling. Discrete Flow Mapping employs local ray tracing approximations, providing a good model of the ray dynamics in homogeneous, isotropic flat plates or on curved shells in the geodesic high-frequency limit. However, in the mid-frequency case when the wavelength approaches the shell’s local radius of curvature, the resulting ray dynamics depend on the curvature in a non-trivial way. In this work, we consider ray-tracing approaches for modelling vibrational energy transport in curved shells of variable thickness at mid-to-high frequencies. In particular, we analyse mid-frequency effects on the dispersion curves for curved shells of variable thickness, and identify novel reflection/transmission behaviour.

Item Type: Conference contribution
Creators: Crofts, J.J., Søndergaard, N. and Chappell, D.J.
Date: 2016
Divisions: Schools > School of Science and Technology
Depositing User: Jonathan Gallacher
Date Added: 28 Jul 2016 16:11
Last Modified: 09 Jun 2017 14:04
URI: http://irep.ntu.ac.uk/id/eprint/28241

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