Proceedings of the 10th Convention of the
European Acoustics Association
Forum Acusticum 2023


Politecnico di Torino
Torino, Italy
September 11 - 15, 2023





Session: A20-04: Inverse methods in acoustics and vibration - Part I
Date: Wednesday 13 September 2023
Time: 10:40 - 11:00
Title: Prediction of Radiated Structural Noise Using Decomposed Vibro-Acoustic Frequency Response Functions
Author(s): L. Barton, Acoustics Research Centre, University of Salford, 43 The Crescent, Salford, M54WT Manchester, UK
A. Elliott, Acoustics Research Centre, University of Salford, 43 The Crescent, Salford, M54WT Manchester, UK
J. Smith, DSTL, Porton Down, SP4 0JQ Salisbury, UK
Pages: 2861-2868
DOI: https://www.doi.org/10.61782/fa.2023.1125
PDF: https://dael.euracoustics.org/confs/fa2023/data/articles/001125.pdf
Conference proceedings
Abstract

The manner in which a system radiates noise is dependent upon the resonant behaviour and the forced vibration of the structure. It has been shown previously that the modes of such a system can be identified by performing a singular value decomposition on the vibro-acoustic frequency response functions (FRFS) measured reciprocally between the structure and a remote response position. In this work, a volume velocity source is used to excite the structure, and reciprocally measured FRFs are used in conjunction with blocked forces, or pressures, to predict the radiated noise from the structure and the radiation modes are separated using a singular value decomposition (SVD). From the singular values, the contribution of each mode, or set of modes, can be applied to the blocked forces noise prediction. Specific singular values are extracted from the transfer functions between the remote excitation point and the structure, which are then rebuilt into transfer functions containing only the contribution of that singular value, which should be associated to a single mode if the surface of the structure is spatially sampled with a sufficient resolution. This single-singular value transfer function then used to determine the contribution to the radiated noise from that individual mode.