Unstable Oscillating Systems with Hysteresis: Problems of Stabilization and Control

Journal of Computer and Systems Sciences International - The work is devoted to studying the dynamics of unstable oscillating systems (in the form of an inverted pendulum) controlled by the action...     

The thermal conductivity of electrical-insulating materials and insulation systems

The thermal conductivity of several electrical-insulating materials used in the insulation systems for windings in turbogenerators and hydroelectric generators, as well as of the Monolith-2 insulation system, was studied using the DTC-300 setup. A collector micaceous stratum (KIFE-A), carbon fiber, glass-fiber laminate with a semiconductor filler (STEF-P), epoxy (DER-438), PK-11 compound in a mixture with ED- 20 resin, and prepreg materials, which are also used for fastening windings when laying them down in a groove, have been studied. The temperature dependences of the thermal conductivity of the studied materials show a linear behavior in the relatively low range from room temperature to +150°C. The temperature distribution over the thickness of the plate that imitates insulation in a groove of an electric machine has been determined. It has been shown that a drop in the temperature between the heat source and the outer surface is a tenth of a degree. The temperature distribution in the groove with a length of 1.5 m and venting channels placed every 50 mm with two insulating rods with different means of fastening rods and insulation thicknesses has been studied using a model of a hydroelectric generator stator (U_w = 13.8 kV, power of 70 MW, Monolith-2 insulation).     

Forming Payoff Matrices in a Formalized Game Between a Shipowner and a Management Company

A conflict between a shipowner and a marine manager is resolved using the methodological apparatus of game theory. Strategies of behaviors of the players (the shipowner and manager) are presented based on which payoff matrixes are formed that promote making decisions providing stable and efficient interaction.