Vol 5, No 1 (2011)

The article contains a solution to the problem of determining the stress-strain state of the car wheel rims with five-and fifteen-degree coupling shelves by the finite element method. The authors used a finite element in the form of a short circular truncated cone, the most fully considering the specifics of design, consisting of shells of revolution with dramatically changing the stiffness and stress. The conclusions about the benefits of tubeless tires, trucks, buses and trains design wheel with a rim having a fifteen-degree coupling shelves, both in terms of use, and from the point of view of strength.

The article describes the importance and challenges of machine-tractor units with front mounting. The authors presented calculation scheme of the front-mounted unit with a device that enhances the stability of the machine-tractor system with a continuous tillage.

The article examines the results of mathematical modeling of gas flow in the stage of power turbine of the two-shaft regenerative gas turbine engine. The authors showed a significant effect of power racks in inter-turbine nozzle of the two-shaft gas turbine engine on the effectiveness of power turbine.

The article examines the design of protection composite armour panel. This panel consists of two parts. The first part is a layer of cylindrical shape with crushing ceramics elements. The second part is a metal plate. The metal plate is a place for crushing elements. This protection panel is used for bullet protection of a car.

The article describes the proposed classifier, which allows you to determine if a specific vehicle design project belongs to concept-art, concepts, or to industrial designs. The classifier is based on two axes - the horizontal axis considers the factors that the designer guided in the development of object shapes, and the vertical axis evaluates the object and its underlying concept in terms of level of science and economic feasibility. Based on this there are refined definitions of concept-art, concept and industrial design.

The paper considers the optimal control laws for asynchronous traction electric motors to minimize various types of losses, minimize consumption of active and reactive power, maximum overload capacity. The authors established that the joint management of the maximum torque and minimum total losses in the motor is most efficient traction control law for asynchronous traction electric motors.

The article examines the influence of flat wheel movement in leading mode on formation of basic surface of movement. On the basis of the developed mathematical model the transfer function considering communication of output and input parameters, and also peak-frequency and phase-response characteristics of movement of the system wheel - supporting surface is defined. Work is executed within the limits of realization Scientific and pedagogical personnel of innovative Russia.

The bases of the work are the basic statements of the theory of risks and procedures of expert analysis and assessment of adverse effects from the hazards in motor systems based on matrix of risk importance assessment.

Tha author shows the influence of the vacuum brake booster static characteristics on gain factor. There are dependences for determining the parameters of the static characteristics of the vacuum brake booster, gain factor cinsidering nonlinearities of the static characteristic.

The article deals with mathematical modeling in the development of vehicles with hybrid power plants. When designing a vehicle one of the major challenges facing developers is the most complete project development before building of prototypes. Properly constructed mathematical model can closely approximate simulation results to real tests. Working with a mathematical model, an engineer can test a car with various units and aggregates, which is almost impossible when dealing with real systems and units.

The article presents the approximate mathematical model of the center of mass dynamics of workpiece in relation to the basic part.

The article examines calculation procedure for accuracy of fixed joints with use of a method of group interchangeability.

The article considers mathematical methods for estimating the effectiveness of safety of potentially hazardous objects in the solution of multi-parameter optimization problems. The developed method involves a system of indicators that can automate the process of decision-making by quantifying the effectiveness of planned activities both in terms of prevention of accidents and cost parameters, which significantly reduces the complexity of solving multi-parameter optimization problems using iterative methods.

This article presents the comparative analysis of methods for cutting process calculating. The known solutions and methods of calculations a chip formation are considered, on their basis comparative calculations of the cutting force are made. It is noticed that the greatest capacity decisions based on the energy method of the analysis using the extreme positions of deformation mechanics. By this method L. D. Olenin analyzed the most general case of cutting, namely the oblique cutting by the tool with a blunt cutting edge, the physical equations for calculation of all major process parameters are received. The decision considers strain hardening material, the real value of contact friction, and also the power spent on the plastic fracture associated with the formation of new surfaces. It is emphasized that all equations are physical. It allows to recommend them as a basis for developing methods for calculating the cutting processes by the tool with any shape and geometry of a cutting part.

The authors proposed the technology of processing of coarse-grained gears for multi-axis CNC equipment. The article examines the potential of the modular disk tool with straight cutting edges for finish machining of involute tooth profiles.

The article considers the theoretical analysis of the formation of aerodynamic lows based on the model of ideal electrochemical formation. Identified forms of error due to the mechanism of material removal, and the possibility of managing their values ​​by choosing the parameters of the regime of electrolysis.

This paper describes a method for complex control of geometrical parameters of ball bearings rings by means of coordinate measuring machines instead of specialized tools used on enterprises of bearing industry. The results of these experiments suggest the possibility of such control by means of coordinate measuring machines.

The article examines the problems of accuracy modeling of joints for location them in assembly units by three planes.

The article identifies and analyzes the data of demagnetizing factor of different (by relative length) samples of granular media (sphere filling) and the cores of an effective channel of magnetization in the chain of balls. The authors give the corresponding experimental and describing them phenomenological dependencies of the demagnetizing factor.

After the exact decision of the equations of movement of a viscous liquid (the equations of Navier-Stokes) under condition of the established current and non compressible liquids it has been revealed that only limited number of lines can appear as the real currents trajectories. This number includes direct lines, concentric circles and some spirals, axis symmetrical currents and currents at which the whirlwind of speed is constant (or equal to zero). It is essential that the established flow of a sphere or the cylinder is impossible, since trajectories of such current are not present among the specified ones. For revealing of sphere flow features, the uniform movement observation was carried out (both single spheres of different size and rigidly connected ones). These spheres formed a figure similar to the single «dumbbells» Or doubled at right angle to two «dumbbells». Experiences have found out the fact of a spontaneous twisting of spheres and «dumbbells» With the speed of a circular motion proportional to linear speed of spheres in motionless water of lake. Thus the twisting occurred always if there was no initial indignation, only counter-clockwise as at movement of spheres in directions the north-south, and the east-West, and upwards-downwards that proves that on rotation of spheres rotation of the Earth cannot render influence.

The problem of stability in the supersonic gas flow of the plate of variable thickness, which forms a part of the surface of a thin gusset, was approached in the linear setting. The plate is freely supported along the edges, the velocity vector of the flow is directed along the axis of the gusset. The critical speed for different values was calculated.

The restructuring process of engineering company involves multifaceted tasks that require a large amount of credible information. In compliance with this, the paper examines the development of the information system that might give an opportunity to provide informational support of the restructuring of engineering enterprise.

This article analyzes the state of the fixed assets of machine-building enterprises. We propose an improved organizational-economic mechanism and the cycle of reproduction of fixed assets at the enterprise.

The paper examines the problems of formation and adequate estimation of the transparency of economic subjects. As one of the tools for solving these problems it is offered to use a method of scoring models. It is also shown that application of scoring models can impact considerably the building of an adequate rating of investment reliability. Also the analysis of the basic difficulties of application for scoring models in Russia is carried out, and the basic levels of formation of a transparency in the economic environment are allocated.

Positive dynamics of industrial production in the real sector of economy from 2004 to mid-2008 was affected by crisis in the period of active development of the economy. The paper gives a substantiation of adverse events that caused the destructive processes in the economy, which led to a fall of the main macroeconomic indicators.

The paper examines the questions of influence of human capital on competitiveness of organization.

The article considers the conceptual, organizational and technological aspects of foreign language training. It carries the list of methods and ways of teaching foreign languages. It is noted that these methods can be employed to serve the purpose of targeted communicative and cognitive development of foreign language learners. This process reinforces students' personality progress.

The study is aimed to identify qualitative components of body composition of stronger wrestlers of the country, allowing to determine the state of fitness of athletes in different periods of training, to develop the scale of individual assessment and quantitative control of body composition at different stages of training of the strongest athletes.

The paper is devoted to the didactic category of goal setting and it's use in the course of rules and laws of communication.