Vol 12, No 2 (2013)

An algorithm of flight photogrammetric calibration of electrooptical equipment for stellar Earth remote sensing using the Kalman filter is developed assuming that the vehicle orientation in the course of the sky survey is known with split-hair accuracy. The algorithm is developed using only the linear magnitudes obtained as a result of projecting the star sphere on a focal plane.

The paper presents a methodology for calculating distribution of potentials based on the triangulation method of plane approximation, surface method and analytical determination of the matrix elements of Coulomb interaction. The results obtained demonstrate good agreement with the experiments on the electrization process in small spacecraft «AIST».

An approach is proposed to determine the durability of transport aircraft wing structure in multi-purpose use. Relationships are obtained for durability calculations based on fatigue test results depending on typical flight profiles and their relative flying time in service. Dependences are obtained for the calculation of damages within the framework of the known discrete model of atmospheric turbulence. The possibility of refining the fatigue damage calculation using the experimental cumulative probability of flight overload increment is shown. Applying to Be-200ChS aircraft, the fatigue damage in firefighting flights obtained from flight test data was found to be 2.75 times greater than the value calculated by the known method.

The paper presents the analysis of ablation process method errors for the definition of the temperature profile of high- temperature gas flows. The main sources of the ablation process method errors are revealed on the basis of physical processes taking place when a high-temperature flow moves around a body. Numerical evaluation of each error source is given.

The stability of an axially symmetrical stationary incompressible swirl flow with radial density jump in relation to infinitesimal spiral perturbations is investigated in the paper The dependences of perturbation frequency and increment on the swirl parameter, axial wave number and density jump are obtained. It is shown that perturbation frequency increases while its increment decreases with the increase in the medium density gradient.

The paper deals with the problem of agreement between the criterial equation for the determination of the heat transfer coefficient and the experimental data for the case of cooling aluminum ingots using the least squares method. An experimental unit for the cooling of aluminum ingots is described. Experimental data are presented.

The paper presents the task of optimization of through-type induction heating installations (IHI) with a continuous delivery of metal semi-finished products for further plastic working. The task of optimal design of one-section and two-section heaters of minimum length has been formulated and solved.

The paper presents the results of research in developing ways of burning gas-generating compositions (GGC) in combustion products forced convection conditions (CPFCC) and the factors that influence the design of a chemical gas source (CGS). The influence of the oxidant amount on the conditions and rate of fuel combustion in CPFCC is analyzed. The relative area of the channels is shown to affect the character of porous charge combustion. If the number of channels and their area increase up to 5%, the rate of combustion and the gas flow rate increase, while if the former increase from 5% to 25% the latter decrease. It was also found that multichannel units with fixed porosity ensure constant consumption and time characteristics, make it possible to get 10-15 – fold pressure reduction in the chamber and increase the length of the charge up to ten diameters.

The paper presents the results of research of hydrodynamic cleaning of hydro-fuel units. The modeling was executed in Matlab-Simulink using transfer functions for the circuit passive elements and the parameters of the flow oscillation source.

The article describes a mockup onboard system for the registration of outer space objects. The results of measuring the position and velocity vector of the objects obtained by the described installation are presented.

The paper deals with the mechanism of interaction between charged microparticles and the mass spectrometer target. Experimental data on measuring the ion flow parameters in case of high-speed impact of the charged particle are presented. The contribution of the charged particle’s potential and kinetic energy to the ionization of the mass spectrometer’s target matter is assessed.

The paper shows the use of confocal laser microscopy for the assessing of viability of mesenchymal bone marrow stromal cells of a rabbit with the resolution of 400 nanometers. A three-dimensional structure of cells is obtained by this method.

The paper deals with the formation of spherical intensity distributions on the basis of the interference of oncoming fine-focused vortex beams with different polarization. The formation of three-dimensional distributions is accomplished in a simple way by optimizing the width and position of a single annular diaphragm. The optimum parameters are analytically estimated for a narrow ring aperture, while those for a broad diaphragm are further numerically corrected. It is shown that, depending on the polarization, the order of the vortex singularity and an additional phase advance in one of the beams both solid and hollow light balls of a subwavelength radius consisting of different components of the electric field can be formed.

The paper deals with the factors affecting the economic performance of an air carrier, airport and airport structures. The target functions of the carrier and the service company are defined. A model of economic cooperation between the air carrier and airport structures is proposed.