Sofia Baldini (Author), Gianluca Guernieri (Author), Domen Gorjup (Author), Paolo Gardonio (Author), Janko Slavič (Author), Roberto Rinaldo (Author)

Abstract

In general, the measurement of the sound radiation field by machinery and partitions requires time-consuming tests, which should be carried out in specially dedicated anechoic/reverberant facilities with calibrated sensors and complex acquisition and post processing equipment. This article introduces a two-step method for the identification from optical measurements of the free- field sound radiation generated by flexural vibrations of closed shells. In the first step, the flexural vibration of the shell is reconstructed with a frequency domain triangulation technique based on short multi-view video acquisitions made with a single high-resolution, high-speed camera. In the second step, the free-field sound radiation is derived from a discretized boundary integral formulation. The study is focused on the identification of the sound radiation from the flexural vibration of a baffled cylinder model structure. The vibration and sound fields reconstructed from the camera measurements are validated against direct measurements taken with a laser scanner vibrometer and a microphone array, respectively. Overall, this research demonstrates that optical methods based on camera measurements can be suitably employed to produce fast and accurate full-field measurements of sound radiation of closed shells (without the need for a dedicated measurement environment, e.g. reverberant, anechoic chambers).

Keywords

videogrammetry;flexural vibration measurement;sound radiation reconstruction;frequency-domain triangulation;

Data

Language: English
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: UL FS - Faculty of Mechanical Engineering
UDC: 534.83
COBISS: 225020931 Link will open in a new window
ISSN: 1096-1216
Views: 24
Downloads: 0
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Other data

Secondary language: Slovenian
Secondary keywords: videogrametrija;merjenje vibracij;zvočno sevanje;triangulacija v frekvenčni domeni;
Pages: 20 str.
Issue: ǂVol. ǂ227, ǂ[art.] ǂ112400
Chronology: 2025
DOI: 10.1016/j.ymssp.2025.112400
ID: 25859539