Microphone-array processing for wind-tunnel measurements with strong background noise

Abstract

During the last decade, microphone arrays became a standard tool to study aeroacoustic sources. Nowadays, arrays are frequently applied in fly-over measurements<sup>1</sup> and wind tunnel testing.<sup>2</sup> To improve the resolution of the arrays and to reduce disturbing side lobes in the measured source maps, sophisticated deconvolution methods were proposed<sup>3-8</sup> in recent years. First, these methods were tested using synthetic data or data from experiments with generic configurations. <sup>8</sup> In a next step the methods have to be applied to real experiments. This is done in the present paper. It is tested, if the deconvolution works also under difficult conditions, and if the findings of the simulations using artificial background noise<sup>7</sup> can be confirmed in case of real data.