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Nova Odesa, Ukraine

Odessa National Maritime Academy is a maritime college in Odessa, Ukraine. It was founded in 1944 as the Odessa Higher Engineering Marine School and renamed in 2002.The studies are carried out according to the graded system. The terms of studies are the following: four years for bachelor, five and a half years for specialist and master. The system of ship's crew training is in compliance with the requirements of the International Convention of Training, Certification and Watchkeeping for Seafarers and other international conventions which give graduates the right to work on all types of vessels of native and foreign companies. Wikipedia.

Popov V.G.,Odessa National Maritime Academy
International Applied Mechanics | Year: 2012

The stress intensity factors (SIF) for a plane circular crack in a finite cylinder undergoing torsional vibrations are determined. The vibrations are generated by a rigid circular plate attached to one end of the cylinder and subjected to a harmonic moment. The boundary-value problem is reduced to the Fredholm equation of the second kind. This equation is solved numerically, and the solution is used to derive a highly accurate approximate formula to calculate the SIFs. The calculated results are plotted and analyzed © 2012 Springer Science+Business Media, Inc.

Shishkin A.V.,Odessa National Maritime Academy
Radioelectronics and Communications Systems | Year: 2011

An algorithm of embedding the digital watermarks into speech signals transmitted through analog channels of VHF radio telephony of the maritime and aeronautical mobile services has been designed. For embedding DWM it was proposed to use the vector quantization of the complex envelope of narrow-band signal. DWM robustness to the intersymbol interference, multiplicative and additive interferences is provided, respectively, by the following means: 1) formation of narrow-band channels, 2) step-size adaptation in the transmitter and receiver, and 3) distribution of DWM energy over L samples. This algorithm makes it possible to implement the automatic identification of radiotelephone transmissions without the replacement of the standard radio communication equipment and variation of the operation procedures of radio telephony. © 2011 Allerton Press, Inc.

Popov V.G.,Odessa National Maritime Academy
Mechanics of Solids | Year: 2013

The paper presents a solution of the problem of determining the stress state in an elastic isotropic half-space with a crack intersecting its boundary under harmonic longitudinal shear vibrations. The vibrations are excited by a regular action of a harmonic shear load on the crack shores. The solution method is based on the use of the discontinuous solution of the Helmholtz equation, which allows one to reduce the original problem to a singular integro-differential equation for the unknown jump of the displacement on the crack surface. The solution of this equation is complicated by the existence of a fixed singularity of its kernel. Therefore, one of the main results is the development of an efficient approximate method for solving such equations, which takes into account the true asymptotics of the unknown function. The latter allows one to obtain a high-precision approximate formula for calculating the stress intensity factor. © 2013 Allerton Press, Inc.

Stetsenko M.S.,Odessa National Maritime Academy
Journal of Petroleum Science and Engineering | Year: 2015

We have performed a molecular dynamics study in order to verify the assumption that saturated hydrocarbons can be characterized by generalized Hook's law using the fourth rank tensor of elastic constants. In this study normal paraffins were treated as crystals of hexagonal symmetry. Thus, we obtained original numerical values of Young's modulus and Poisson's ratio in both anisotropic and isotropic planes and the values of the shear modulus at three different temperatures.Negative Poisson's ratio of n-paraffins is of a particular interest. The author believes that auxetic behavior of saturated hydrocarbons is the result of their liquid-crystalline nature. Another remarkable point is the non-linear elasticity of n-paraffins detected in a wide temperature range. This provides an additional experimental confirmation of the phase transition process of hydrocarbons earlier reported in scientific works.We have shown that the matrix of elasticity of a particular heavy petroleum product can be estimated using the elastic parameters of the n-paraffins obtained. The numerical values of five independent elastic constants are directly proportional to the composition of a heavy petroleum product. The simplified representation of the composition can be defined by a few saturated hydrocarbons with different carbon numbers.The numerical results obtained in this research may be useful for those interested in heavy petroleum fractions rheology as well as those who perform numerical studies in petroleum hydrodynamics and acoustics. © 2014 Elsevier B.V.

Koshevyy V.M.,Odessa National Maritime Academy
IEEE National Radar Conference - Proceedings | Year: 2015

The 'Joint Optimization of Radar Waveforms' and 'Filtering Target Returns from Interfering Radar Reflections (Clutter)' methods are considered. The optimization is provided under additional range resolution power constraints and signal-to-noise ratio loss constraints. There are different constraints on duration and bandwidth for the optimized waveform and filter as well. Optimized waveforms and filters create sets with group-complementary properties, which are extensions of Golay complementary sequence concept, expanded over the mismatched case. © 2015 IEEE.

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