One-dimensional pressure transfer models for acoustic–electric transmission channels

• Published in: Journal of sound and vibration 2015-09, Vol.352, p.158-173
• Main Authors: Wilt, K.R., Lawry, T.J., Scarton, H.A., Saulnier, G.J.
• Format: Article
• Language: English
• Subjects: Acoustics; Channels; Compatibility; Data transmission; Mathematical models; Piezoelectricity; Pressure waves; Transducers
• ISSN: 0022-460X; 1095-8568
• DOI: 10.1016/j.jsv.2015.04.031

A method for modeling piezoelectric-based ultrasonic acoustic–electric power and data transmission channels is presented. These channels employ piezoelectric disk transducers to convey signals across a series of physical layers using ultrasonic waves. This model decomposes the mechanical pathway of the signal into individual ultrasonic propagation layers which are generally independent of the layer׳s adjacent domains. Each layer is represented by a two-by-two traveling pressure wave transfer matrix which relates the forward and reverse pressure waves on one side of the layer to the pressure waves on the opposite face, where each face is assumed to be in contact with a domain of arbitrary reference acoustic impedance. A rigorous implementation of ultrasonic beam spreading is introduced and implemented within applicable domains. Compatible pressure-wave models for piezoelectric transducers are given, which relate the electric voltage and current interface of the transducer to the pressure waves on one mechanical interface while also allowing for passive acoustic loading of the secondary mechanical interface. It is also shown that the piezoelectric model׳s electrical interface is compatible with transmission line parameters (ABCD-parameters), allowing for connection of electronic components and networks. The model is shown to be capable of reproducing the behavior of realistic physical channels.