EFFECTS OF BULK ACOUSTIC WAVES PROPAGATING ORTHOGONAL TO THE ROTATION AXIS OF THE MEDIUM
The aim of this work was to study the effects that occur during the propagation of bulk acoustic waves (BAW) in rotating media. To theoretically analyze the features of the propagation of BAW, a solution of the equation of motion was performed for plane harmonic waves propagating orthogonal to the axis of rotation of the propagation medium. An analysis of the results of the solution showed that under the action of rotation, the polarization of the waves will be elliptical. The ratio of the axes of the polarization ellipse is proportional to the speed of rotation of the medium and can be used as an informative parameter of the sensitive elements (SE) angular velocity sensors (AVS). When analyzing the obtained solution, an analytical dependence of the informative SE parameter on the Poisson's ratio of the sound duct material was revealed. The effect of rotation on the dispersion of the velocity of propagating BAW was analyzed. Two methods have been proposed for implementing the design of the layout of the SE. To conduct experimental research, an installation was developed and a model of the SE was made. As a result of the experiments, previously advanced theoretical positions were confirmed and the sensitivity of the layout was evaluated. The results obtained are correlated with previous theoretical studies.
Authors: Ya. Durukan, A. N. Peregudov, M. M. Shevelko
Keywords: Ultrasonic waves, velocity, bulk acoustic waves, elliptical polarization, sensing element, angular velocity sensor
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