Improving source discrimination performance by using an optimized acoustic array and adaptive high-resolution CLEAN-SC beamforming

Beamforming performance can be improved in two ways: optimizing the location of microphones on the acoustic array and applying advanced beamforming algorithms. In this study, the effects of the two approaches are studied. An optimization method is developed to optimize the location of microphones for an acoustic array used in an open-jet...

Experimental study of shielding of propeller noise by a wing and comparison with model predictions

The shielding of engine noise by the airframe of an aircraft is considered an effective way of reducing noise levels on the ground. Noise shielding in conventional aircraft is mainly due to the presence of the wings and most model predictions of full-scale aircraft neglect the effect of the airfoil curvature. The engine is typically simpliffied...

A Microphone Array Method Benchmarking Exercise using Synthesized Input Data

High-Resolution CLEAN-SC: Theory and Experimental Validation

Noise breakdown of landing aircraft using a microphone array and an airframe noise model

Improving beamforming by optimization of acoustic array microphone positions

Assigning proper positions to microphones within arrays is essential in order to reduce or eliminate side- and grating lobes in 2D beamform images. In this paper an objective function is derived providing a measure for the presence of artificial sources. Using the global optimization method Differential Evolution an optimized microphone...

Using Global Optimization Methods for Acoustic Source Localization

Conventional beamforming is a common method to localize sound sources with a microphone array. The method, which is based on the delay-and-sum beamforming, provides an estimate value for the source strength at a given spatial position. It suffers from low spatial resolution at low frequencies, high side lobe levels and requires the user to...

APIAN-INF: A Low-Speed Aerodynamic and Aeroacoustic Investigation of Pylon – Pusher Propeller Interaction Effects

An experimental investigation was performed at the Large Low-speed Facility of the German-Dutch wind tunnels (DNW-LLF) to study the pylon interactions associated with pusher propellers. The aerodynamic and aeroacoustic effects of pylon trailing edge blowing and swirl recovery vanes (SRVs) were evaluated. The pylon installation increased the...