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Browsing by Author "Shatalov, MY"

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Analysis of a new unidimensional model and lateral vibrations of 1-3 piezocomposite side scan sonar array

Author: Shatalov, MY ; Fedotov, I ; Wallis, JR ; Nicolaides, KE Date: Jan 2006 A novel unidimensional model of 1-3 piezocomposite ultrasonic transducers is presented. A new electromechanical model is the generalization of the Smith-Auld unidimentional model, which is formulated in terms of a variational approach. It ... Read more
Analysis of axisymmetric and non-axisymmetric wave propagation in a homogeneous piezoelectric solid circular cylinder of transversely isotropic material

Author: Shatalov, MY Date: Jan 2010 A study concerning the propagation of free non-axisymmetric waves in a homogeneous piezoelectric cylinder of transversely isotropic material with axial polarization is carried out on the basis of the linear theory of elasticity and linear ... Read more
Analysis of non-axisymmetric wave propagation in a homogeneous piezoelectric solid circular cylinder of transversely isotropic material

Author: Shatalov, MY ; Every, AG ; Yenwong-Fai, AS Date: 2009 A study concerning the propagation of free non-axisymmetric waves in a homogeneous piezoelectric cylinder of transversely isotropic material with axial polarization is carried out on the basis of the linear theory of elasticity and linear ... Read more
General problems of dynamics and control of vibratory gyroscopes

Author: Shatalov, MY Date: May 2008 A general model of operation of vibratory gyroscopes, which is applicable to a broad class of instruments, including cylindrical, disc and micro-machined gyros, is formulated on the basis of analysis of dynamics and control of a hemispherical ... Read more
Gyroscopic effects in vibrating fluid-filled spheres subjected to inertial rotation

Author: Shatalov, MY ; Joubert, SV ; Coetzee, CE ; Fedotov, I Date: Jul 2007 In symmetric distributed structures subjected to vibration and an inertial rotation, the vibrating patterns turn in the direction of revolution at a rate proportional to the inertial angular rate. This effect has numerous applications in ... Read more
Influence of mass imperfections on the evolution of standing waves in slowly rotating spherical bodies

Author: Shatalov, MY ; Joubert, SV ; Coetzee, CE Date: Jan 2011 Standing waves can exist as stable vibrating patterns in perfect structures such as spherical bodies, and inertial rotation of the body causes precession (Bryan’seffect). However, an imperfection such as light mass anisotropy destroys the ... Read more
Investigation of gyroscopic effects in vibrating fluid-filled cylinders subjected to axial rotation

Author: Shatalov, MY ; Joubert, SV ; Voges, E Date: Jul 2007 Vibrating patterns of distributed oscillating structures, subjected to rotation, also turn in the direction of inertial revolution but with different angular rates, which depend on the geometry of the structures, the number of modes, etc. ... Read more
Modelling and implementation of 1-3 piezocomposite side scan sonar array

Author: Shatalov, MY ; Wallis, JR ; Nicolaides, KE Date: Jun 2005 A design and implementation of a 1-3 piezocomposite side scan transmit sonar array is considered. The theoretical approach to the array design is based on a new concept of one-dimensional modelling of 1-3 piezocomposite transducers, developed ... Read more
Non-axisymmetric vibrations of a transversely isotropic piezoelectric cylinder with different types of electric boundary conditions

Author: Shatalov, MY ; Every, AG ; Yenwong-Fai, AS Date: Apr 2007 Coupled electro-mechanical non-axisymmetric vibrations are considered in a transversely isotropic piezoelectric cylinder with axial polarization. Solutions of the system of equations are found by exact integration using a seven functional ... Read more
Novel approach to the Helmholtz integral equation solution by Fourier series expansion for acoustic radiation and scattering problems

Author: Shatalov, MY ; Fedotov, I ; Joubert, S Date: 2006 Conventional methods of solution of the Helmholtz integral equation consist in discretization of a radiating/scattering boundary on multiple boundary elements, assumption of a smooth distribution of the velocity potential on every element and ... Read more
On gyroscopic effects in vibrating and axially rotating solid and annular discs

Author: Joubert, SV ; Fedotov, I ; Pretorius, W ; Shatalov, MY Date: May 2007 “Bryan’s effect" - that is, the effect of a vibrating pattern’s precession in the direction of inertial rotation of a vibrating ring - was discovered by G. Bryan in 1890. This effect has several applications in navigational instruments, such ... Read more
One-dimensional diffusion model in an Inhomogeneous region

Author: Fedotov, I ; Katskov, D ; Shatalov, MY ; Marais, J Date: 2006 A one-dimensional model is developed to describe atomic diffusion in a graphite tube atomizer for electrothermal atomic adsorption spectrometry. The underlying idea of the model is the solution of an inhomogeneous one-dimensional diffusion ... Read more
Progress in the analysis of non-axisymmetric wave propagation in a homogeneous solid circular cylinder of a piezoelectric transversely isotropic material

Author: Every, AG ; Shatalov, MY ; Yenwong-Fai, AS Date: Jan 2010 Non-axisymmetric waves in a free homogeneous piezoelectric cylinder of transversely isotropic material with axial polarization are investigated on the basis of the linear theory of elasticity and linear electromechanical coupling. The solution ... Read more
Rotating structures and Bryan’s effect

Author: Joubert, SV ; Shatalov, MY ; Fay, TH Date: May 2009 In 1890 Bryan observed that when a vibrating structure is rotated the vibrating pattern rotates at a rate proportional to the rate of rotation. During investigations of the effect in various solid and fluid-filled objects of various shapes, ... Read more
Scattering of obliquely incident standing wave by a rotating transversely isotropic cylinder

Author: Shatalov, MY ; Fedotov, I ; Joubert, S Date: May 2006 It is known that vibrating patterns of an isotropic cylinder, subjected to inertial rotation over the symmetry axis, precess in the direction of rotation with a different angular rate. The proportionality coefficient, or the so-called Bryan ... Read more
The vibration of a layered rotating planet and Bryan’s effect

Author: Shatalov, MY ; Joubert, SV ; Coetzee, CE Date: Dec 2011 As among other seismological observations, it is important to be able to predict the location of the vibrating pattern of an earthquake. In this chapter, the authors take the first tentative steps towards including "Bryan’s effect" in a ... Read more
Vibratory gyroscopes : identification of mathematical model from test data

Author: Shatalov, MY ; Lunin, BS Date: May 2007 Simple mathematical model of vibratory gyroscopes imperfections is formulated, which includes anisotropic damping and variation of mass-stiffness parameters and their harmonics. The method of identification of parameters of the mathematical ... Read more

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