Vol 2, No 1 (2003)

Dynamic processes in rocket - space systems such as rocket carriers and side blocks, small re-entry capsules with double rotation, also in auxiliary elements such as separation systems, solar batteries and antennas aperture systems (both with and without taking into account suspension elasticity) are discussed. Mathematical motion models are developed, dynamic processes are analyzed and parameters are synthesized in side blocks separation systems, in head fairing of rocket carrier and in solar battery panels. Re-entry capsule with double rotation is treated as a mechanical system of co-axial bodies with variable mass, having linear regularities of change of mass and moments of inertia.

A modernised scheme of splitting Navier-Stokes equations for the numerical method of "vortex-in-cell" is proposed. The method consists in introducing a minor parameter proportional to kinematic viscosity into the scheme. It allows finding the solution of the problem in the form of asymptotic series. An advection-diffusion problem of the Lamb-Ozeen vortex is considered for the verification of the proposed method. Computation results obtained by "donor-acceptor" (D-A) and MD-A methods are compared with an analytical solution of the advection-diffusion problem. The MD-A method is shown to be more suitable for low viscosity flow simulation. Unlike the D-A method, the MD-A method remains accurate in a wide range of space and time resolution.

The paper presents the procedure and results of thermal stress state analysis in a turbine disc herringbone groove when it is subjected to thermoplastic strengthening. The thermoplastic strengthening method is found to create a propitious field of compression residual stress in a superficial layer of a part of any geometry complexity.

The paper describes the optoelectronic discrete phase method for measuring deformation of blades of rotating bladed-disc assemblies of turbomachines. Advantages and disadvantages of different versions of optoelectronic discrete phase method realization are dealt with. Acriterion relating parameters of the reflecting surface to the radiator wavelength and making it possible to formulate the conditions necessary for the implementation of the method is introduced. Several circuit diagrams of devices for the realization of the method are presented.

The theoretical foundations for developing technological processes of mounting airborne electrical equipment are presented.

Devices for controlling wall thickness of hollow pieces have been designed and patented. Thickness is increased due to wave pressure of surplus material by an elastic tool. A mathematical model of material redistribution and simple dependences for practical use have been proposed. The results of experimental investigations are given.

Scientific departments and laboratories of Samara State Aerospace University have wide experience in ensuring reliability and defining safe life expectancy of aircraft structural elements. The paper provides the description of the procedure of estimating probability of reliable operation of different purpose pipeline systems. Measures permitting considerable reduction of operation loads and increase of reliability and durability are also described.

The paper deals with the problems to be solved for the creation of a digital speckle interferometer that makes it possible to study vibration of mechanical elements excited simultaneously at several frequencies. The method of registering specklograms has been developed on the basis of methods of holography and speckle-interferometery. Separate spectral components of surface oscillations in case of broadband object stimulation are shown. The method developed is based on time modulation of laser beams in the interferometer.

Characteristics of a stationary p rocess of directional separation have been constructed on the basis of thermomechanical analysis, their interrelation with the known destruction criteria has been established.

Automated complex of processing telemetry information is realized on the basis of a local network. Customer computers of the testers functioning in parallel are connected to the processing server on the basis of socket technology. Mathematical methods and graphic models for defining the time of executing standard jobs of telemetry information processing are proposed. A simulation model for the analysis of telemetry information processing system productivity has been developed.

The aggregate of economic stimulation mathematical models is suggested, which allows setting and solving tasks of analysis and synthesis of multiparameter stimulation systems, evaluating the extent of their influence on the mechanisms of implementing planned tasks and the efficiency of functioning both of individual industrial elements and the system as a whole.

The article deals with some institutional problems of higher educational market formation. Subsystems of education and market segments of higher educational service are described, comparative characteristics of different types of higher educational establishments are given.