Print Email Facebook Twitter Functional beamforming applied to imaging of fly-over noise on landing aircraft Title Functional beamforming applied to imaging of fly-over noise on landing aircraft Author Merino Martinez, R. (TU Delft Aircraft Noise and Climate Effects) Snellen, M. (TU Delft Aircraft Noise and Climate Effects) Simons, D.G. (TU Delft Aircraft Noise and Climate Effects) Date 2016 Abstract 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. To reference this document use: http://resolver.tudelft.nl/uuid:716358f5-6ddd-496c-93fe-6f1c3b111177 DOI https://doi.org/10.2514/1.C033691 ISSN 0021-8669 Source Journal of Aircraft: devoted to aeronautical science and technology, 53 (6), 1830-1843 Part of collection Institutional Repository Document type journal article Rights © 2016 R. Merino Martinez, M. Snellen, D.G. Simons Files PDF Functional_beamforming_ap ... t_PURE.pdf 4.15 MB Close viewer /islandora/object/uuid:716358f5-6ddd-496c-93fe-6f1c3b111177/datastream/OBJ/view