Beamforming correction for the singular problem in identifying rotating sources with non-uniform directivity.

Area of Science:

• Acoustics
• Signal Processing
• Aeroacoustics

Background:

• Rotating sources with non-uniform directivity are crucial in aeroacoustic measurements.
• Existing source identification methods can produce singularities due to directivity function zeros.

Purpose of the Study:

• To propose a correction method for aeroacoustic source imaging.
• To address singularities caused by source directivity in rotating sources.
• To improve the accuracy of identifying rotating sound source positions and strengths.

Main Methods:

• De-Dopplerized microphone signals transformed to the frequency domain.
• Deconvolution with transfer functions to compensate for directivity.
• Numerical simulations and experiments with rotating dipole loudspeakers.

Main Results:

• The proposed method effectively removes directivity influence on source imaging.
• Singularities in the source map are successfully restrained.
• Accurate estimation of source positions and strengths achieved.
• Method validated for arbitrary orientations and high background noise.

Conclusions:

• The developed correction method enhances rotating source identification in aeroacoustics.
• It offers improved accuracy over traditional algorithms.
• The technique is robust and applicable in noisy environments.