Using Optimized Time-Frequency Representations for Acoustic Quality Control of Motors

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We investigate the application of time-frequency representations to acoustic quality control of electric motors. The signals exhibit a cyclostationary characteristic. Its periodicity is due to the process of noise generation. For two types of faults we compare different statistics based on first and second order properties of the data with a recently introduced method based on time-frequency representations. This procedure takes advantage of the freedom to choose a smoothing kernel by optimizing it in a data dependent manner. Since the spectrum and the local variance are special cases of the time-frequency representations the optimization procedure might also indicate that these simpler quantities are sufficient to perform the classification task. This was the case in one of the faults considered.

Document Type: Research Article

Publication date: November 1, 1997

More about this publication?
  • 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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