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The artile deals with steady-state longitudinal vibrations of plates consisting of curvilinear rings placed one inside the other without interference, under the effect of a harmonic distorting load acting along the outer periphery. The rings are made from different isotropic materials that are physically nonlinear. The problem is solved by the method of successive approximations. In each approximation the sought functions are represented in the form of expansions with respect to a small parameter. Numerical investigations were carried out for plates consiting of two concentrically arranged circular rings.Translated from Problemy Prochnosti, No. 3, pp. 24–27, March, 1991. 相似文献
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K. M. Abdullaev M. M. Agamaliev V. E. Kosmodamianskii O. O. Dadashova 《Journal of Water Chemistry and Technology》2010,32(3):187-192
The article has considered flow charts for the preparation of make-up water of boilers of low, medium, and high pressure (9.8
MPa) from the sea water based on reverse-osmosis desalination. We have proved the possibility of deep Na-cationic softening
of permeate by their own concentrates of the desalination stage. Reliable prevention of calcium deposits on membranes is achieved
by acidulation of the waters of the Black Sea and Na-(Mg-Na)-zeolite softening process of the Caspian Sea waters also with
the use of the concentrate for regeneration of the cation-exchanger. 相似文献
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We consider steady-state torsional oscillation of a tapered rod under the action of tangential forces, which are arbitrarily
distributed over its lateral surface, and twisting moments applied to its ends. To solve this problem, we suggest a method
based on the series expansion of the displacement function in a nondimensional parameter which depends on the characteristics
of the material and the frequency of loading. We present computational investigations for particular cases of loading.
Translated from Problemy Prochnosti, No. 3, pp. 62–68, May–June, 1998. 相似文献
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K. M. Abdullaev M. M. Agamaliev I. A. Malakhov V. E. Kosmodamianskii A. A. Askerniya O. O. Dadasheva 《Thermal Engineering》2008,55(4):299-304
Technologies of preparing makeup water for boilers are considered, central to which is combined use of ion-exchange and reverse-osmosis methods for treatment of seawater and ocean water. It is shown that the concentrate produced by reverse-osmosis plants can be used as preferred material for regenerating filters at the stages during which source water and water at the outlet from the reverse-osmosis plant are treated with Na-and Mg-Na-cation exchange resins. 相似文献
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A. S. Kosmodamianskii V. I. Vorobiev A. A. Pugachev 《Russian Electrical Engineering》2011,82(8):445-448
The faults and damages of the asynchronous motors currently used in the traction rolling stock are reviewed. It is shown that
a significant number of failures in operation are due to the excessive temperature in the stator coil and how it affects the
mechanical characteristics and the traction performance of the asynchronous motor windings. 相似文献
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A. S. Kosmodamianskii V. I. Vorob’ev A. A. Pugachev 《Russian Electrical Engineering》2012,83(12):667-671
The goal is to synthesize a control system for an induction motor such as to ensure operation with minimal power losses. Standard nonlinearity and losses in the steel of the motor’s stator are taken into account in MatLab simulation. The proposed control system reduces the losses by up to 25% in comparison with classical scalar control. 相似文献
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A. A. Pugachev A. S. Kosmodamianskii Yu. M. In’kov 《Russian Electrical Engineering》2017,88(9):600-604
Based on a review of investigations of the thermal behavior of induction motors, it has been established that the stator winding of an induction motor is subject to very high values of temperature in most applications and work regimes. The analysis of techniques to determine the temperatures of different units of an induction motor helped us to propose the use of equivalent thermal circuits, in particular, a simplified substitution circuit for the determination of winding and a magnetic conductor of a stator. The thermal equilibrium equations were found. A technique to calculate the thermal resistances of a stator by means of a laboratory setup was developed. The setup considers the features of cooling specific types of motors; thus, it is unnecessary to observe an induction motor as an aerodynamic system. The technique was tested using a setup containing a 14-kW short-circuited induction motor. The temperatures in different units of a motor were measured using chromel–copel thermocouples, and its load simulated the load of a traction electric drive of transport vehicles. The results of the experimental investigation are presented to show the influence of the rotor speed and the cooling air flow on the thermal resistances. 相似文献