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To overcome the limitation of stationary sound sources, two approaches of beamforming for rotating sound sources are presented, e.g., in an axial fan.<\/jats:p><jats:p>Regarding the restrictions concerning source model and boundary conditions, an inverse method is proposed in which the wave equation in the frequency domain (Helmholtz equation) is solved with the corresponding boundary conditions using the finite element method. The inverse scheme is based on minimizing a Tikhonov functional matching measured microphone signals with simulated ones. This method identifies the amplitude and phase information of the acoustic sources so that the prevailing sound field can be with a high degree of accuracy.<\/jats:p>","DOI":"10.1007\/s00502-021-00881-6","type":"journal-article","created":{"date-parts":[[2021,3,25]],"date-time":"2021-03-25T21:59:06Z","timestamp":1616709546000},"page":"229-243","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":12,"title":["Sound source localization \u2013 state of the art and new inverse scheme","Schallquellenlokalisation: state of the art und neues inverses Verfahren"],"prefix":"10.1007","volume":"138","author":[{"given":"Stefan","family":"Gombots","sequence":"first","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8403-693X","authenticated-orcid":false,"given":"Jonathan","family":"Nowak","sequence":"additional","affiliation":[]},{"given":"Manfred","family":"Kaltenbacher","sequence":"additional","affiliation":[]}],"member":"297","published-online":{"date-parts":[[2021,3,25]]},"reference":[{"key":"881_CR1","first-page":"62","volume-title":"Beamforming in Acoustic Testing","author":"T. 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