We study the effects of medium rotation on bulk acoustic wave (BAW) propagation. For a theoretical analysis of the BAW propagation characteristics, a motion equation for the plane harmonic waves propagating orthogonal to the rotation axis of the propagation medium was analytically resolved. We found that during medium rotation, the polarization of the waves becomes elliptical with the ratio of the polarization ellipse axes explicitly proportional to the angular velocity of the medium rotation, thereby opening the way for the design of sensitive elements (SE) for perspective angular motion sensors (AMS). Next, an analytical dependence of the SE informative parameter on the Poisson’s ratio of the acoustic duct material was obtained. The rotation effect on the dispersion of BAW propagation velocity was studied. Two approaches to the perspective SE design were proposed. An experimental study of a specially designed test assembly and SE model demonstrated high correlation with theoretical predictions and provided an estimate of a potential SE. Therefore, we believe that the study of acoustic wave propagation under nonclassical conditions is a promising direction for prospective solid-state AMS on based on BAW polarization effects design.
Modern MEMS gyros are widely used nowadays, however, the field of high dynamic moving objects is still hardly accessible for them because of rigid requirements for the sensors to be shock resistant. Solid state gyros (SSG), namely, those that are based on surface acoustic waves (SAW), are likely to become the solution to this problem. This paper provides a short introduction to theory of SAW based SSGs and a brief overview of the existing design concepts, which are described, analyzed, and compared with each other. The main advantages, problems, and prospects for further development of SAW based SSGs are discussed.
The fundamental questions of the theory of quasilinear parabolic systems are the questions of the solvability of boundary value problems and of the Cauchy problems for these systems, and also the questions related to the asymptotic behavior of the solutions when the time increases unboundedly. Numerous investigations on the qualitative theory of these systems have been inspired by the well-known classical work of A. N. Kolmogorov, I. G. Petrovskii, N. S. Piskunov (1937). A large theoretical and applied interest has the investigation of systems that arise in the mathematical modeling of chemical processes, the so-called reaction--diffusion systems.This paper is devoted to the investigation in the half-space
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