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Nizhniy Novgorod, Russia

Aref'ev N.N.,Volga State Academy of Water Transport
Power Technology and Engineering | Year: 2014

A method is developed for analysis and plotting of an impeller blade of a centrifugal soil pump. The method provides for mathematical description of the median of the blade, making it possible to plot its smooth contour with consideration of assigned blade angles at the entry and exit, and also the angle of its contact. The method obtained can be used in SAPR for design of centrifugal pumps, since it is appreciably simpler and more accurate as compared with the familiar graphical method of conformal depiction on the surface of a circular cylinder. The optimal contour of the blade extends the longevity of the soil-pump impeller. An example of practical utilization of the method developed is given © 2014, Springer Science+Business Media New York. Source

Kogan D.I.,Moscow State University of Instrument Engineering and Informatics | Fedosenko Yu.S.,Volga State Academy of Water Transport
Automation and Remote Control | Year: 2010

We introduce a model of one-stage service for a group of stationary objects located along a one-dimensional working zone of a moving processor. For the servicing, the processor sequentially performs two passes between boundary points of the working zone: the direct pass, servicing some of the objects, and the reverse pass, servicing all remaining objects of a group. With each object, we associate an individual penalty function that increases monotonely with the time of finishing its servicing. We formulate design problems for optimal servicing strategies, give algorithms of their solutions, and study the issues of computational complexity. © 2010 Pleiades Publishing, Ltd. Source

Aref'ev N.N.,Volga State Academy of Water Transport
Power Technology and Engineering | Year: 2015

An analytic method for designing blades of the impeller of an axial dredge pump is developed. The method allows a mathematical description of the skeleton line as a parabola, taking into account the entrance and exit angles of the blade. The method can be used in CAD software to design axial-flow pumps. © 2015, Springer Science+Business Media New York. Source

Khvatov O.S.,Volga State Academy of Water Transport | Dar'enkov A.B.,Nizhny Novgorod State Technical University
Russian Electrical Engineering | Year: 2016

Electric propulsion systems have been recently used very often in various transport units. Traction electric motors can be powered, along with other consumers, from a uniform power station (UPS) of a selfsupporting unit. The application of a UPS promotes reliability and simplifies maintenance of the self-supporting unit’s electric system as the number of components of the latter is reduced. As a rule, a UPS is constructed on the basis of diesel generator sets (DGSs) of constant rotation frequency. The cost effectiveness of an electric station can be improved with the use of DGSs of varying rotation frequency. In this case, fuel economy is achieved by generating optimal shaft rotation frequency of the internal combustion engine, corresponding to the lowest brake-specific fuel consumption. The list of Russian and foreign published works dedicated to this topic is rather short, especially concerning research on the dynamic mode of work, the development of a mathematical model for the unit, and creation of a control system for a UPS with a DGS of varying rotation frequency. This article addresses the above issues, contains mathematical and simulation models of a self-supporting unit’s UPS with a DGS of varying rotation frequency, and shows the results of modeling. © 2016, Allerton Press, Inc. Source

Bubnov E.Y.,Volga State Academy of Water Transport
Moscow University Physics Bulletin | Year: 2013

An acoustic field generated by a moving dipole that consists of two antiphased monopoles and an axial quadrupole represented as a combination of four discrete monopoles with corresponding phases was analyzed. It was revealed that the angular distribution of the pressure amplitude of the distributed source depends on the additional phase incursion between interfering waves due to the anisotropic character of the medium. The angular characteristics of the pressure amplitude of the distributed dipole and quadrupole, which depend on the orientation and velocity of their motion, were mathematically simulated. The results were compared with the conclusions drawn by other researchers. © 2013 Allerton Press, Inc. Source

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