TY - JOUR
T1 - Functional beamforming applied to imaging of fly-over noise on landing aircraft
AU - Merino Martinez, Roberto
AU - Snellen, Mirjam
AU - Simons, Dick
PY - 2016
Y1 - 2016
N2 - Functional beamforming is a state-of-the-art nonlinear algorithm based on the conventional frequency domain beamformer. In general, it is found to provide improved array spatial resolution and dynamic range. The computational time required for the functional beamforming is approximately the same as that for the conventional frequency domain beamformer and, in general, notably shorter than those of the deconvolution methods. In this paper, several simulations are presented comparing the performance of this algorithm with other imaging methods. Moreover, this beamforming technique is applied to 115 flyover measurements performed with a 32 microphone array on landing aircraft. The simulated and experimental results show good agreement. It is found that, for both synthetic and experimental data, functional beamforming offers better quality acoustic images, with a dynamic range (i.e., the difference in decibels between the main lobe and the highest sidelobe) approximately 30 times larger and an array spatial resolution (i.e., the width of the main lobe 3 dB below its peak) approximately 6 times better than the conventional frequency domain beamformer. All these factors indicate that functional beamforming is a very promising algorithm for processing acoustic array data.
AB - Functional beamforming is a state-of-the-art nonlinear algorithm based on the conventional frequency domain beamformer. In general, it is found to provide improved array spatial resolution and dynamic range. The computational time required for the functional beamforming is approximately the same as that for the conventional frequency domain beamformer and, in general, notably shorter than those of the deconvolution methods. In this paper, several simulations are presented comparing the performance of this algorithm with other imaging methods. Moreover, this beamforming technique is applied to 115 flyover measurements performed with a 32 microphone array on landing aircraft. The simulated and experimental results show good agreement. It is found that, for both synthetic and experimental data, functional beamforming offers better quality acoustic images, with a dynamic range (i.e., the difference in decibels between the main lobe and the highest sidelobe) approximately 30 times larger and an array spatial resolution (i.e., the width of the main lobe 3 dB below its peak) approximately 6 times better than the conventional frequency domain beamformer. All these factors indicate that functional beamforming is a very promising algorithm for processing acoustic array data.
UR - http://resolver.tudelft.nl/uuid:716358f5-6ddd-496c-93fe-6f1c3b111177
U2 - 10.2514/1.C033691
DO - 10.2514/1.C033691
M3 - Article
SN - 0021-8669
VL - 53
SP - 1830
EP - 1843
JO - Journal of Aircraft: devoted to aeronautical science and technology
JF - Journal of Aircraft: devoted to aeronautical science and technology
IS - 6
ER -