Inferring Material Parameters of a Single Mode Piezo Element from a Derived Electrical Series Model
By: Banerjee, paramita
.
Contributor(s): Ghosh,Ratna.
Publisher: New York Springer 2022Edition: Vol, 103(6), Dec.Description: 1975–1985p.Subject(s): Electrical EngineeringOnline resources: Click here
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Journal of the institution of engineers (India): Series BSummary: material characterizations of piezo elements are often done using their modal analysis. Vibration of the piezo element depends on its geometry, poling directions and recommended aspect ratios. Of these, the choice of the aspect ratio is most common in order to ensure the modes of resonance, which generate vibrational motion in a specified direction. It is widely reported that for a disc type piezo element or buzzer, both sides of which are plated and which is excited across its thickness, the dominant mode is the thickness longitudinal mode of vibration. In this paper, the material characterization of such thin radial disc piezo buzzers and of the same piezo buzzer attached with an aluminium substrate of same shape and size has been inferred from their impedance characteristics, considering the thickness longitudinal mode of vibration. For this, the impedance characteristics have been determined from an impedance model that has been derived using the constitutive laws in the audio frequency range. Thereafter, the equivalence of this model to an electrical equivalent impedance model, which consists of series connected passive impedance blocks, has been established. This provides the basis for the estimation of two complex material characteristics of the piezo buzzer as well as its modification.
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material characterizations of piezo elements are often done using their modal analysis. Vibration of the piezo element depends on its geometry, poling directions and recommended aspect ratios. Of these, the choice of the aspect ratio is most common in order to ensure the modes of resonance, which generate vibrational motion in a specified direction. It is widely reported that for a disc type piezo element or buzzer, both sides of which are plated and which is excited across its thickness, the dominant mode is the thickness longitudinal mode of vibration. In this paper, the material characterization of such thin radial disc piezo buzzers and of the same piezo buzzer attached with an aluminium substrate of same shape and size has been inferred from their impedance characteristics, considering the thickness longitudinal mode of vibration. For this, the impedance characteristics have been determined from an impedance model that has been derived using the constitutive laws in the audio frequency range. Thereafter, the equivalence of this model to an electrical equivalent impedance model, which consists of series connected passive impedance blocks, has been established. This provides the basis for the estimation of two complex material characteristics of the piezo buzzer as well as its modification.
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