Prediction of Radiated Structural Noise Using Decomposed Vibro-Acoustic Frequency Response Functions

Barton, L.; Elliott, A.; Smith, J.

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.

Citation

Barton, L., Elliott, A., & Smith, J. (in press). Prediction of Radiated Structural Noise Using Decomposed Vibro-Acoustic Frequency Response Functions. #Journal not on list, https://doi.org/10.61782/fa.2023.1125

• Journal Article Type: Article
• Conference Name: 10th Convention of the European Acoustics Association Forum Acusticum 2023
• Conference Location: Torino, Italy
• Acceptance Date: Aug 7, 2023
• Online Publication Date: Jan 17, 2024
• Deposit Date: Feb 21, 2024
• Publicly Available Date: Feb 21, 2024
• Journal: Proceedings of the 10th Convention of the European Acoustics Association Forum Acusticum 2023
• Electronic ISSN: 2221-3767
• Peer Reviewed: Peer Reviewed
• DOI: https://doi.org/10.61782/fa.2023.1125