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A Correlation Measurement Method for Rotating Sources of Noise

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Abstract:

A mathematical model of the correlation measurement method which uses two controllable delay lines to track the rotating source of the wide-band noise is presented. The method suppresses the reflections and disturbances from static sources as well as those from the rotating sources lying at some distance from the measured source. It separates the component of direct waves coming from the relatively small part of the total source volume. The measurement results in the total power, or, in some cases, in the auto-correlation function or the power spectrum density of the signal from the source free-field, averaged over all angle positions of the source. The partial experimental verification of the method is also presented.

Zusammenfassung

Es wird ein mathematisches Modell für ein Korrelationsmeßverfahren vorgestellt, das mit Hilfe zweier steuerbarer Verzögerungsleitungen zur Verfolgung einer rotierenden, breitbandigen Rauschquelle arbeitet. Das Verfahren unterdrückt Reflexionen und Störungen sowohl statischer als auch rotierender Quellen, wenn sie sich in einiger Entfernung von der zu messenden Quelle befinden. Ferner gestattet es die Abspaltung des aus einem relativ kleinen Teil des gesamten Quellenvolumens kommenden Direktschalls. Ergebnis der Messung ist die Gesamtleistung oder, in einigen Fällen, die Autokorrelationsfunktion bzw. die spektrale Leistungsdichte des Freifeldsignals der Quelle, gemittelt über alle Winkelpositionen der Quelle. Eine teilweise experimentelle Verifikation des Verfahrens wird ebenfalls angegeben.

Sommaire

On présente un modèle mathématique décrivant une méthode de mesure par corrélation utilisant deux lignes à retard réglable pour suivre une source rotatoire émettant un bruit à large bande. Cette méthode supprime les réflexions et les perturbations provenant de sources statiques ainsi que d'autres sources rotatoires situées à quelque distance de la source étudiée. Elle enregistre seulement la composante des ondes provenant directement d'une partie relativement petite du volume total de la source étudiée.La mesure fournit la puissance totale, ou, dans certains cas, la fonction d'autocorrélation ou la densité spectrale de la puissance du signal provenant de la source émettant en champ libre, après avoir fait la moyenne sur toutes les positions angulaires de la source. On présente aussi une vérification expérimentale.

Document Type: Research Article

Publication date: 1980-03-01

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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