Vol 11, No 2 (2012)

The motion of spacecraft as a rigid body connected to a space tow with a viscoelastic tether in the central gravitational field is discussed in the paper. The equations of spacecraft spatial motion and the orbital motion of the system’s center of mass in osculating elements are obtained on the basis of Lagrange formalism. The influence of the system’s parameters and the initial conditions of motion on the motion of the spacecraft is analyzed. The possibility of critical modes of motion leading to the entanglement of the tether is shown.

The paper deals with the principles of constructing systems and objects of a space rocket complex including parameter series of the launch vehicle «Rus-M» modifications.

A flight to high near-earth orbits using a two-stage booster with a sequential arrangement of stages with chemical and electro-rocket engines is discussed in the paper. Simulation for a number of flight schemes is presented. Areas of preferential application of different types of boosters are determined in terms of maximum payload mass placed on the target orbit.

The methodology and results of the numerical simulation of gas flow with sprayed fuel combustion
in a helicopter gas turbine annular combustor are presented. The goal of the simulation is to
predict the non-uniformity of the combustor exit gas temperature field. The calculations are performed in two settings: a) with the simplified model of a full-size combustor included in the computational domain; b) with the one-burner sector of the combustor included in the computational domain and setting periodic boundary conditions. The results of the numerical simulation confirmed the influence of periodic boundary conditions on the accuracy of prediction of the combustor exit gas temperature field. The full-size combustor calculation is shown to be more appropriate and universal but more costly than the calculation of its one-burner sector.

The emergency situation of tether jamming that occurs in the process of its dynamic deployment when a payload is being delivered from the orbit is discussed in the paper. The influence of the moment of jamming on the subsequent motion of the space tether system elements is analyzed. It is shown that the events may develop in three possible ways after the jamming takes place: collision of the payload with the spacecraft, the winding of the tether on the spacecraft or a series of rebounds of the payload which do not result in collision or winding. Jamming at the initial stage of deployment is the most hazardous scenario as it leads to the collision of the payload with the spacecraft or the winding of the tether.

The paper outlines joint work of Ilyushin design bureau and general designer of engines N. D. Kuznetsov on creating aircraft.

The paper presents the description and assessment of methods used to protect the drainage holes of unpressurized compartments from the penetration of electromagnetic field caused by electrostatic discharges on the spacecraft surface.

The need for combining technological and research equipment of modern manned submersibles in the all-in-one complex with a module structure is shown in the paper. The peculiarities of assembling, exploitation and future development are discussed.

The paper is devoted to the design and investigation of special dampers of working environment pressure pulsations intended to reduce the inherent hydrodynamic noise of test rigs. Structural designs of pressure pulsation dampers and the results of analyzing their efficiency in vibroacoustic tests of ship hydraulic system components are presented.

The main causes of vibration and pulsation loading of a combined pump’s elements are described in the paper. Measures to reduce them are proposed on the basis of numerical and experimental analysis. Numerical calculations of the measures proposed are assessed experimentally. Numerical and experimental analysis of the influence of combined air on the loaded state of the pump is described.

The paper is devoted to the development of a mathematical model of heat exchange between heat-treated aluminum ingots and cooling air. The cooling process takes place in a cooling chamber that allows automatic regulation of the process. Defects of aluminum semifinished ingots and methods of their elimination are discussed. A mathematical model of cooling a number of aluminum ingots is presented.

The paper deals with the methodological peculiarities of numerical simulation of separation processes in the context of the finite element method. It is shown that a poorly conditioned global stiffness matrix reflects the essence of the separation process. A method for monitoring the reliability and accuracy of the calculated data by means of the spectrum of a non-regularized global stiffness matrix is put forward. The possibility of assessing the spectrum of a global stiffness matrix through the sums of local matrices is shown.

The paper presents a model of sedimentation of mechanical impurities of heterogeneous materials with the use of video information. A method is proposed for determining the parameters of individual materials on the basis of the analysis of their combined image using discrete Fourier transform.

The paper presents a mathematical description of mobile robots with hybrid mechatronic drives. Basic solutions for the organization of operating the robots of the type under consideration are outlined.

The paper is devoted to the problems of creating the thesaurus of the domain «Aircraft design. The stage of the development of technical proposals». The kinds of relations between the terms in the thesaurus and the principles of creating them are described. The focus is on the creation of associative relations as the most controversial ones which require scientific substantiation. Examples of syntactic representation of the thesaurus in the OWL language are given.

The paper deals with a conceptual model of an Integrated Data System (IDS) for the control of individual and small-scale production of aviation components. The model is based on the maximization of economic assessment while optimizing the information and material flows in production and sale of the output. The presented methodology of IDS assessment makes it possible to take timely corrective measures in the process of implementation.

The paper deals with educational franchising and distance learning at Russian and foreign higher educational institutions.

In the framework of microscopic simulation a mathematical model of the stock exchange is developed in the case of one type of shares. The model exhibits self-maintained trading which results in the price formation which is sensitive only to the values of internal market parameters. The main statistical properties of the resulting price time series which are similar to the real stock time series are consistent with so-called stylized facts of real market data. The program Exchange simulation which is a computer representation of our model is developed and implemented.