High-Resolution localization of broadband sound sources in a duct using out-duct array measurements

• Published in: Measurement : journal of the International Measurement Confederation Vol. 231; p. 114583
• Main Authors: Zhou, Xiaoping, Wang, Lufeng, Yu, Liang, Wang, Ran, Jiang, Weikang
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 31.05.2024
• Subjects: High resolution; Iterated Bayesian focusing; Multi-source broadband localization; Out-duct measurement; High resolution; Multi-source broadband localization; Iterated Bayesian focusing; Out-duct measurement
• ISSN: 0263-2241; 1873-412X
• DOI: 10.1016/j.measurement.2024.114583

This paper investigates using an Iterated Bayesian Focusing Algorithm and out-duct array measurements to identify multiple broadband sources placed in a cylindrical duct. The problems of large main lobe and low resolution due to localization of sources using conventional methods are investigated in this paper. To solve these problems, an Iterated Bayesian Focusing (IBF) method is utilized to localize the broadband sources. To evaluate and confirm the efficacy of the method, simulation tests and experimental validation are performed. In our experiments, we used a 56-channel dobby spiral array for out-duct measurements and beamforming method, equivalent source method (ESM), deconvolution approach for the mapping of acoustic sources (DAMAS), and Iterated Bayesian Focusing (IBF) method to localize broadband sources inside the duct. Simulation and experimental results demonstrate that the Iterated Bayesian Focusing (IBF) method significantly reduces the main lobe width and minimizes the number of minor lobes. This leads to improved accuracy in localizing double sources. •Broadband localization of stationary sources in a cylindrical duct is investigated.•Investigated using an out-duct microphone array for localizing induct sound sources.•Localization of a single sound source versus two sources is investigated.•Iterated Bayesian Focusing (IBF) is applied to improve the resolution of the results from the conventional methods.