2003. № 11

Methods and tutorials

Krylov S. S., Dzuba D. V.

The paper looks at a specialized module of construction and visualization of interactive illustrations for computer aided algebra and geometry teaching systems. Unlike common universal 2-D and 3-D graphics systems, the designed component ensures imposition of strict mathematical conditions on the elements of the graphic scene. This approach is extremely convenient in the course of development of teaching systems as it considerably simplifies the preparatory process of interactive illustrations.

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Aviation technics and technology

Volkov A. A., Stepanov A. A.

Object of research were control systems of submission {supply} of the hydropump. Activities are connected to research of power characteristics of power units. The special attention has been given to efficiency of power units on various modes of unloading. During activities the reasons of decrease {reduction} in efficiency and possible {probable} ways of the solution of this problem have been analysed.

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Zakharov M. A.

The comparative analysis of non-stationary components be carried out (caused by the horizontal plumage, linearly dependent on a derivative of a corner of attack on time ), for various cases of a relative ventilation of the plane: at movement of the plane (in flight) and at movement of air concerning motionless (and also rotating) the plane (for example, in a wind tunnel on installation with an opportunity of periodic change of a direction of a stream). Corners of attack and a corner of a taper of a stream on horizontal plumage are determined valid and settlement (stationary). The current corner of a taper of a stream on horizontal plumage contains a corner of a stationary taper and a corner proportional . At definition of total non-stationary components on the specified installation, there is the methodical error caused by distinction of values ( ,), for moving and motionless planes.

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Aerospace propulsion engineering

Pismenny V. L.

The principles of work and choice of optimum parameters of work of turboejector engines are stated. The principle possibility of using turboejector engines for an aircraft with a cruising supersonic speed is shown (М = 3,5/3,8).

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Technical cybernetics. Information technology. Computer facilities

Rybackov K. A., Sotskova I. L.

We consider the new approach to solution of a theoretical probabilistic analysis problem for the multidimensional stochastic systems with the variable structure, i.e. the systems for which the uneven changing of some parameters or the structure as a whole is typical. The spectral form of the mathematical describing of systems is suggested [2,5,6,7]. In the paper the equations and the algorithm to solve the problem in the spectral area are given.

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Malygin V. V., Silin V. B.

This article argue for necessity of building up computer-aided design systems (CAS) based on information-calculating networks that brings to combinatorial task of the distribution CAS computation process among interconnected single computers. It also proposes formalization scheme for described task, describes major results of its analysis and lists perspective solution methods.

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Malygin V. V.

This article describes analysis of combinatorial solution set (space) of computing network structure design problem. It also presents formal definition of the combinatorial space point, estimations of the space size and its metric characteristic, simple coordinate system.

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Malygin V. V.

This paper describes research on relative error estimation of random search method of distributed information-computing system structure design problem. Developed method and analytical dependence of distribution quality function limits are presented.

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Malygin V. V.

This paper describes investigation on computing network structure quality function convergence. Basing on obtained results statistical method of the best structure probabilistic search is proposed together with its effectiveness estimation and necessary calculation tables.

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Navigation systems

Lifanov A. S.

In clause the original method of selection of the driven targets with use of a series of the subaperture images of a fragment of the hologram is considered. Questions of increase of quality of the radar-tracking images, questions of autofocusing, definition of parameters of movement of the found objects also are considered. The ways of the further development and perfection of the offered algorithm are given.

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