Vibration and noise radiation from a panel excited by a turbulent flow

Malcom Smith , Eduardo Latorre Iglesias

Experiments to simulate the flow induced vibration and noise radiation from a car window are described. Two cases are considered: flow over a backwards-facing step and flow over a half-cylinder placed on a flat plate. The first configuration represents the flow separation and subsequent flow re-attachment into a turbulent boundary layer generated by the A-pillar of a car. The second configuration is representative of the turbulent flow over a side window produced by a car wing mirror. Measurements were carried out in an open jet anechoic wind tunnel at ISVR, where a very low noise flow of up to 40 m/s can be achieved. Wall pressure fluctuations were measured using a streamwise array of microphones, from which the frequency-wavenumber spectrum of the pressure fluctuations was obtained. The vibrational response of the test panel was measured on a grid of points and noise radiation was measured using sound intensity mapping and a fixed microphone in the acoustic far-field. The data are analysed to determine the relative importance of acoustic and convective excitation of the panel.

Mots clés: turbulence; flow; noise; vibration

Domaines: Acoustique [physics.class-ph]

Malcom Smith, Eduardo Latorre Iglesias. Vibration and noise radiation from a panel excited by a turbulent flow. Acoustics 2012, Apr 2012, Nantes, France. ⟨hal-00811273⟩