Vibration of and radiated acoustic power from a simply-supported panel excited by a turbulent boundary layer excitation at low Mach number

Abstract

The general context of this study is to perform cross-validation of analytical and numerical calculations of vibroacoustic response of panels under a turbulent boundary layer excitation. This article focuses on the specific case of a rectangular aluminum panel with controlled simply-supported boundary conditions, and tested in a lowspeed anechoic wind tunnel (Mach number ≤ 0.12). An underlying goal is to setup a microphone array for directly estimating the radiated sound power from the panel. The vibration of and radiated sound power from the panel are first estimated under a shaker mechanical excitation so as to verify agreement with theoretical calculations and the relevance of the proposed shoebox-shaped microphone array. Similar measurements are then conducted under a turbulent boundary layer excitation. Finally, estimated radiation efficiencies under point mechanical and turbulent excitations are compared. © 2019 Institute of Noise Control Engineering