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Sound Sources Identification for Machine Acoustic Signals Based on Combined Wave Superposition Method

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The wave superposition is based on the idea that an acoustic radiator can be approximated represented by the sum of the fields due to a finite number of interior point sources. But in practice, a large number of measurements must be used in order to achieve a desired resolution, which makes the reconstruction process very time consuming and high cost. In this paper, a combined wave superposition method is developed for reconstructing acoustic radiation from machine acoustical signals. This method combines the advantages of both the wave superposition and Helmholtz equation-least squares (HELS) methods. As such it allows for reconstruction of the acoustic field from an arbitrary object with relatively few measurements, thus significantly enhancing the reconstruction efficiency. In a semi-anechoic chamber, a cross-planar microphone array, which consists of 29 microphones, was successfully applied to obtain the two-dimensional mapping of the sound sources. The location, the sound pressure and the properties in frequency domain of the sound sources can be found through this method precisely. The experimental results demonstrate that the combined method is very eff ective in the low-to-mid regime, and can potentially become a powerful noise diagnostic tool.
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Document Type: Research Article

Publication date: January 1, 2006

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  • Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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