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Vibration Analysis and Frequency Equation for an Ultrasonic Transducer Consisting of a Longitudinal Vibrator and a Flexural Circular Plate

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A transducer for producing ultrasonic radiation in gases is studied. The transducer consists of a circular plate in flexural vibration and a longitudinal electromechanical vibrator which is attached to the centre of the plate. The vibration mode of the transducer was. analyzed. The equivalent circuit of the transducer was presented and the frequency equation derived. The analysis shows that the equivalent circuit method is very useful in analyzing (he vibration mode and the resonant frequency of the transducer. Two such transducers were designed according to the frequency equation and their resonant frequencies and displacement distributions were measured. The measured resonant frequencies were in good agreement wilh the theoretical frequencies.

Zusammenfassung

Es wird ein Wandler für die Erzeugung von Ultraschall in Gasen untersucht. Der Wandler besteht aus einer zu Biegeschwingungen erregten Kreisplatte und einem longitudinalen longitudinalen elektromechanischen Schwinger, der im Mittelpunkt der Platte angekoppelt ist. Es wurde die Schwingungsform des Wandlers untersucht. Das Ersatzschaltbild des Wandlers wird vorgestellt und die Frequenzgleichung wird abgeleitet. Die Untersuchung erweist die Nützlichkeit der Methode des Ersatzschaltbildes für die Analyse der Schwingungsmode und der Resonanzfrequenz des Wandlers. Es wurden zwei derartige Wandler gemäß der Frequenzgleichung konstruiert, und ihre Resonanzfrequenzen und Schwingungsverteilungen wurden gemessen. Die gemessenen Resonanzfrequenzen waren in guter Übereinstimmung mit den theoretisch vorhergesagten Frequenzen.

Sommaire

Nous étudions un transducteur, destiné à l'irradiation ultrasonore de gaz, constitué d'une plaque circulaire vibrant en flexion et d'un vibrateur électromécanique longitudinal attaché au centre de la plaque. On a analysé les modes de vibration du transducteur à partir de l'équation du movement et établi le circuit équivalent. L'utilisation du circuit équivalent se révelè trés utile pour l'analyse des modes de vibration et des fréquences de résonance du transducteur. On a réalisé deux transducteurs de cette sorte, et mesuré leurs fréquencies de résonance et les distributions des déplacements. Les fréquencies mesurées étaient en bon accord avec les valeurs théoriques.
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Document Type: Research Article

Publication date: January 1, 1995

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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