title: Multiple line arrays for the characterization of aeroacoustic sources using a time-reversal method.
abstract: This letter investigates the use of multiple line arrays (LAs) in a Time-Reversal Mirror for localizing and characterizing multipole aeroacoustic sources in a uniform subsonic mean flow using a numerical Time-Reversal (TR) method. Regardless of the original source characteristics, accuracy of predicting the source location can be significantly improved using at least two LAs. Furthermore, it is impossible to determine the source characteristics using a single LA, rather a minimum of two are required to establish either the monopole or dipole source nature, while four LAs (fully surrounding the source) are required for characterizing a lateral quadrupole source.
authors.affiliation: School of Mechanical Engineering, The University of Adelaide, South Australia 5005, Australia akhilesh.mimani@adelaide.edu.au, con.doolan@adelaide.edu.au, paul.medwell@adelaide.edu.au.
authors.forename: A
authors.initials: A
authors.lastname: Mimani
authors.forename: C J
authors.initials: CJ
authors.lastname: Doolan
authors.forename: P R
authors.initials: PR
authors.lastname: Medwell
mesh_terms: D000162:Acoustics / Q000295:instrumentation*; D000465:Algorithms; D003198:Computer Simulation; D004867:Equipment Design; D009038:Motion; D009622:Noise; D009716:Numerical Analysis, Computer-Assisted; D011312:Pressure; D012815:Signal Processing, Computer-Assisted; D013018:Sound Spectrography; D013997:Time Factors; D014159:Transducers; D014919:Wind