Search

The methods of conductive supracrystalline nanotubes spiralization are shown. Such coiled nanotubes can be used as the solenoids in nanoelectronic components of radio-technical systems. The calculations of conductance of the solenoids and inductance of the magnetic field created into them are given.

This article highlights the longevity tests results of compact two-positioned electromagnetic pneumatic valves that are widely used in aviation and aerospace industry. Authors determined main degradation processes that take place in valve elements under the work loads and their influence on the efficiency of the electromagnetic valve and its functional parameters. It was revealed that change of the technical condition of valve components under the workloads is the result of two degradation processes: shock-fatigue destruction and impact-abrasive wear. Practical recommendations for increasing of work efficiency for this type of valves were created and introduced at JSCB «Kiev Central Design Bureau of Valves». Local standard «Methods of efficiency calculations for electromagnetic valves during design process» was created. [ABSTRACT FROM AUTHOR]

Creating effective synchronous motors with permanent magnets for electric vehicles requires the development of the mathematical models of electromagnetic field to simulate the processes taking into account the rotation of the rotor in real time. Considered a "colector" type of rotor design. Executed the complex of scientific researches which allowed to substantiate the selection of the basic motor parameters, which to provide appropriate power and size, such as: the number of poles, the value of the air gap, the size of the permanent magnets. Investigated the harmonic composition of the EMF of the stator winding and the electromagnetic torque ripple. It is shown that the combined use of a special form of the poles of the rotor and the stator skewed slots significantly reduces the torque ripple. [ABSTRACT FROM AUTHOR]

We address the optimal control problems in the coefficients for a nonlinear elliptic equation with Dirichlet boundary conditions for generalized solenoidal controls. We define the shape stability concept for optimal control problems. Finally, we reveal the sufficient conditions for perturbation of the domain, under which the shape stability of the problem under study occurs. [ABSTRACT FROM AUTHOR]