Cylindrical Piezoceramic Radiator as a Complex Dynamic System

Authors N.V. Bogdanova , A.G. Leiko , S.А. Naidа, A.I. Drozdenko

National Technical University of Ukraine «Igor Sikorsky Kyiv Polytechnic Institute», 16, Politekhnichna St., 03056 Kyiv, Ukraine

Issue Volume 11, Year 2019, Number 6
Dates Received 30 August 2019; revised manuscript received 06 December 2019; published online 13 December 2019
Citation N.V. Bogdanova, A.G. Leiko, S.А. Naidа, A.I. Drozdenko, J. Nano- Electron. Phys. 11 No 6, 06011 (2019)
PACS Number(s) 43.38. + n
Keywords Cylindrical piezoceramic radiator, Dynamic control from the electrical side, Physical fields.

A cylindrical piezoceramic sound emitter, formed by two coaxial thin piezoceramic spaced-apart shells with circumferential polarization and an elastic medium between them, is considered as a dynamic system with parameters operationally controlled from the electrical side during performance. Taking into account the interconnection of the electric, mechanical, and acoustic fields of the shells during the energy conversion of the energy exchange between the shells inside the emitter, when forming the acoustic field, the calculated relationships to determine the physical fields of the emitter under the dynamic control and the interconnectedness of the energy conversion processes, as well as its formation in space by electric fields parameters of field’s shells, are obtained. It is shown that the quantitative characteristics of the dynamic behavior of the emitter depend on the ratio of the magnitudes of the electrical voltages supplied to the piezoceramic shells, the phase difference between them, the size of the shells and their materials electrophysical parameters, as well as physical parameters of the media filling the shells. A method of numerical analysis revealed the behavior of the emitter’s physical fields when changing the shells’ electrical excitation voltages and the phase difference between them for the case when the frequencies of the main form of mechanical vibrations of both shells in vacuum are the same. At the same time, a number of properties important for practical application of such emitters were established. The control of the amplitudes and phases of the exciting envelope of electrical voltages allows to: significantly increase the acoustic efficiency of the emitter and significantly expand the frequency range of its resonant sound emission without increasing the overall dimensions of the emitter; provide operational control of the emitter shells’ mechanical fields, bringing their particle velocities to the maximum possible in terms of maintaining emitter’s mechanical strength; to determine the laws of electric fields radiation of the emitter during dynamic control of its performance taking into account the method of excitation of piezoceramic shells. A physical interpretation of the causes of these properties is given.

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