SCIENCE & EDUCATION

The paper deals with 3-D finite element analysis (FEA) of different metal forming processes in terms of Eulerian description of continuun motion. Three technological processes being characterized by high plastic strain ratio have been researched. The processes analyzed are: the piercing of solid cylindrical billet on a helical piercing mill; the high-reduction pendulum rolling of a flat bar; the lengthwise rolling of a rectangular bar billet in profiled roll pass of a heavy merchant mill. As a result of computer simulation the time-dependent stress and strain fields and deformed shape of the billets during the rolling process were obtained. Power consumption of the processes studied was estimated too. Eulerian problem formulation has allowed not only to solve a problem of high plastic deformations, but also to analyze the phenomena of intense mass transfer without finite elements grids distortion.

Management of credit risk is understood as a series of measures, accepted by bank for reduction of size of losses in credit operations and maintenance of necessary level of own liquidity in case of infringement by the counterpart of the obligations.

The way of synthesis of functions of traffic control of the biped walking robot in a mode of dynamic walking on an equal horizontal surface by means of the simplified mathematical model is presented.

And positions of the concept of construction of system of electrohydraulic drives of the biped walking robot (ДШР) for the extreme conditions, received by authors on the basis of experience of creation laboratory ДШР main principles are presented to MGTU of N.E.Baumana

In article the algorithm of management by a corner of folding of sections articulated tracked vehicle which use raises smoothness of a course of the car at the expense of decrease in amplitudes of longitudinal-angular fluctuations section is presented.

In work the known idea about dynamic self-organising of parametres of genetic algorithm has been studied and finished. It has allowed to develop fast and reliable genetic algorithm. The developed algorithm has been tested on known criterion functions. For the first time process of evolution of algorithm and the decisions arising at work of algorithm has been investigated.

Dynamic system attainability domain approximate construction problem is discussed. We analyze this problem solution approaches based onconsecutive and parallel “multi-finish” methods, respectivedifferential equations system vector field approximation, and neural nets. As an example, we discuss specified methods application for aircraft attainability domain boundary approximate construction.

In article is reviewed base of maximum likeness extrapolation first. Then there are a few recommendations for model identification based on researched time series. Later there are results of extrapolation of researched time series. In the end there is mention of model features and further development of maximum likeness extrapolation model. All researched was done on REM time series (prices and volumes).

The paper considers the direct adaptive method for multi-criteria optimization based on fuzzy approximation of decision maker’s utility function. We provide some results of method effectiveness research for solving two- and three-criteria test problems.

The methodology of optimization of spatial orientation of cylindrical preparation is considered in view of its{her} deviations{rejections} of the form with the purpose of reduction of waste products at machining.

 The article is dedicated to the question of optimization of engine work cycle. The engine is 16 ЧН 26/26. The computer simulation was made. As a result the optimal magnitudes of boost pressure P_int and angel of fuel injection φ_овт  were identified. Optimization was made with 3 meanings of maximal cycle pressure P_max =15,2; 17 and 21MPa.

In clause the method of adapting of interfaces of users on terminology of a data domain of activity in systems of creation and usage of distributed heterogeneous informational resources is described. The model of the template of representation of the informational resources underlying a method of adapting is presented. 

The integrated equations with a kernel of creep and резольвентой, for the description nonlinear вязкоупругости a yarn, with application of the hereditary theory are received. On the basis of the received integrated equations the technique of forecasting of behaviour of a yarn under loading on curves of creep with application of a principle of is intense-time analogy is developed. Possibility of application of the received integrated equations, and according to developed forecasting techniques is shown on an example of calculations of diagrammes of a stretching of a yarn on creep curves. In quality нормированной creep functions function арктангенс from sedate argument is applied.

The short analysis of requirements to relational tables is made. Specificity of a problem of transformation of the existing information of a tabular kind to relational tables is considered. The method of the automated reduction of values of attributes of the filled not relational tables to uniform type is offered. Possibilities of existing tool design tools of databases for the decision of a problem of reduction of values of attributes of the existing information of a tabular kind to one type are considered.

In mass production the control of deviations from cylindric and straightforwardness of an axis of details of type of shaft can be carried out in the automated mode, using scanners which are located in N sections on length of a detail

In work the possible scheme очувствления the surgical tool for carrying out of operations in vessels is considered. The offered scheme allows the surgeon in operating conditions (on line) to receive the information on level of working efforts in the field of surgical intervention. It can be used for designing очувствленных working bodies of robots – manipulators of surgical appointment. A working out main objective is creation of the system, allowing to warn possible mechanical damages of biological fabrics in the course of carrying out of surgical operation.

In this article there is an description of mathematical model, which is used in computer program VIS, besides You can find some information about its identification. Empirical equations and coefficients were selected as a result of identification. A good convergence of calculation and experimental data confirm that identification is true.

Results of modelling and calculations of the parametres characterising about diamond turning of reflecting surfaces of metals elements, chemical lasers a part to the optical scheme are resulted. By a subject of researches are accepted: process ultraprecise cutting edge processings surfaces of metals elements, regime parametres is diamond turning, forces, temperatures, processing errors. Recommendations about perspective possibilities diamond turning are developed.

Some operations reforming ultra- and hypergraphs are considered. These operations realize project procedures of analysis and synthesis the complex system structure using their mathematical models.

In article the problem of appointment of key fields in the filled relational tables is formulated. The algorithm of revealing and primary keys in existing relational tables is offered. The algorithm of appointment of primary keys in the filled relational tables is offered. Possibilities СУБД Access for the decision of a problem of revealing and appointment of key fields are considered.