Topical problems of corporative control in aircraft manufacturing

In this paper, the necessity for applying the corporative methods and tools of control over the processes of development, production, and realization of aircraft engineering articles is substantiated. The general structure of aircraft-manufacturing corporation is presented. Some problems of constructing the most advanced computer-aided corporative systems of control in aircraft manufacturing are discussed.     

Features of RadioAstron Mission Control

Support means of the Spektr-R spacecraft flight and features of the Mission Control Center operation and spacecraft control are considered. Software for scheduling and preparing sessions of controlling and simulating for the spacecraft operation are considered. The problems of ballistic navigation support of the spacecraft flight are presented. Ground spacecraft control segment and software for analyzing and imaging telemetric information are considered.     

Thermal conductivity of thermal barrier coatings

The results of experimental studies of the thermal conductivity coefficient of thermal barrier coatings (TBC) are presented. A technique for its determination is proposed and tested. The data of design evaluation of the TBC thickness distribution along the outline of a cooled turbine blade are given.     

Calculation of axial gasodynamic forces,disk friction losses and overflow in semiopen impellers of centrifugal compressors

The methods for calculating axial forces, disk friction losses and overflow are developed on the basis of experimental data on the radial pressure distribution at both sides of the semi-open impeller, disk friction and overflow through clearances between the blades and the case.     

Investigation of landing gear wheel shimmy taking into account damper frequency characteristics

A mathematical model and a technique for calculating the rolling motion stability of the damper-equipped landing gear wheel are presented; the dependence of dynamic damper rigidity on frequency found experimentally is used in the investigation. The results of calculating the shimmy boundaries with and without regard for the dependence indicated are given.     

Temperature strain of a shallow cylindrical shell under local damage of a protective layer

The dynamic and static uncoupled thermoelasticity problems for a thin shallow cylindrical shell under the action of local temperature field is considered. This field appears as a result of mechanical damage of a protective layer region.     

On equilibrium stability in the Sitnikov problem

The problem of stability of the trivial equilibrium position in the Sitnikov problem is considered in the first approximation. The first approximation is shown to have the form of a linear second-order equation with time-periodic coefficient (the Hill-type equation). The equilibrium stability was studied on the basis of equation regularization in the vicinity of a singular point with subsequent calculation of the trace a of the monodromy matrix. The equilibrium stability is shown to be stable for almost all values of eccentricity e from the [0, 1] interval. The instability takes place on the discrete set of e values, when the mutipliers are multiple (with non-simple elementary divisors), e = 1 being a point of crowding of this set.     

A problem of choosing a generalized parameter of flexible spacecraft structures to construct a fractal model of microaccelerations

Problems of revealing and forming a generalized parameter are considered to obtain an adequate estimation of microaccelerations aboard a spacecraft with the aid of a real part of the fractal Weierstrass-Mandelbrot function (WMF) at the phase identically equal to zero.     

The Rosetta Alpha Particle X-Ray Spectrometer (APXS)

The Alpha Particle X-Ray Spectrometer (APXS) is a small instrument to determine the elemental composition of a given sample. For the ESA Rosetta mission, the periodical comet 67P/Churyumov-Gerasimenko was selected as the target comet, where the lander PHILAE (after landing) will carry out in-situ observations. One of the instruments onboard is the APXS to make measurements on the landing site. The APXS science goal is to provide basic compositional data of the comet surface. As comets consist of a mixture of ice and dust, the dust component can be characterized and compared with known meteoritic compositions. Various element ratios can be used to evaluate whether chemical fractionations occurred in cometary material by comparing them with known chondritic material. To enable observations of the local environment, APXS measurements of several spots on the surface and one spot as function of temperature can be made. Repetitive measurements as function of heliocentric distance can elucidate thermal processes at work. By measuring samples that were obtained by drilling subsurface material can be analyzed. The accumulated APXS data can be used to shed light on state, evolution, and origin of 67P/Churyumov- Gerasimenko.