Improving beamforming by optimization of acoustic array microphone positions

Conference paper (2016)

Authors

A.M.N. Malgoezar Aircraft Noise and Climate Effects - Aerospace Engineering

M. Snellen Aircraft Noise and Climate Effects - Aerospace Engineering

P. Sijtsma Aircraft Noise and Climate Effects - Aerospace Engineering

D.G. Simons Aircraft Noise and Climate Effects - Aerospace Engineering

Research Group

Aircraft Noise and Climate Effects (Aerospace Engineering) (TU Delft)

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http://resolver.tudelft.nl/uuid:fbd90d16-483c-4d33-a0e0-29cafabc1a69

Published Date

2016

Language

English

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Faculty

Aerospace Engineering

Department

Control & Operations

Research Group

Aircraft Noise and Climate Effects

Abstract

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 configuration is obtained by minimization of this objective function. Results show that optimizing the microphone locations can significantly enhance the array performance. In a large part of the scan region surrounding the true source location, no side- or grating lobes are present, meaning that the source can be unambiguously located. From the optimization it is also found that the optimized array configuration shows the microphones distributed at almost constant distance. A linear relation is found which shows that the distance decreases with increasing frequency. This knowledge is important information for the design of an optimal microphone configuration.

Files

BeBeC_2016_S5.pdf

(.pdf | 0.939 Mb)