Reconstruction of cylinder flexural vibration and sound radiation fields from multi-view single-camera measurements

This paper presents experimental results on the reconstruction from video measurements taken with a single camera of the flexural vibration and sound radiation fields of a baffled cylinder. The study is focused on the vibration and sound radiation generated by a time-harmonic radial force acting on the cylinder at selected resonance frequencies. The measurement setup is composed by a single high-resolution and high-speed camera, which, however, has been set to acquire multi-views of the radiating cylinder in order to implement a frequency-domain triangulation to derive the cylinder flexural vibration field. The cylinder sound radiation field was then reconstructed with a closed form integral expression derived from the Kirchhoff-Helmholtz integral equation. More precisely, the integral expression was approximated into a summation over a grid of elements the cylinder surface had been divided into. The study shows that the proposed measurement approach accurately estimates the flexural vibration and the sound radiation fields of the cylinder at selected resonance frequencies.