The authors developed and presented methods for calculating of threaded joints under dynamic (cyclic and impact) load applied along the planes parallel to the joint, considering energy dissipation for structural damping when installing the bolts with a gap and without gap.
The authors presented the method for formulating and solving problems with multiobjective parametric adjustable parameters. There are proposed three options for solving the problem. The authors suggested the characteristics of suspension design parameters control of class passenger "B" car considering road microprofile.
This article deals with the specificity, design features, operational costs for special equipment and stochastic optimization models for spare parts and special equipment supply for Ural vehicles.
This article considers the solution of strength problems of a plate heat exchanger used in air conditioning systems in aircraft cabins on the nonstationary operating conditions. The authors proposed the scheme of structural improvements, the model is calculated in elastic and elastic-plastic formulation and there are presented conclusions and proved advantages of the proposed heat exchanger design.
The paper deals with the most important problems of the theory of wheeled and tracked vehicles, associated with the concepts of controllability, observability and vehicle stability. There are fundamental theoretical research on direct estimations of dynamic properties of an object, but the current level of reflection requires a systemic approach to solving those problems, and deal with the theoretical studies.
In the work there are various types of equations describing nonholonomic kinematic connections of the road wheel with the supporting surface. The authors deal with evidence of the adequacy of the results of the pilot studies, and provide justification for the use of each equation type.
The authors considered the method for improving the stability and controllability of two-section truck to optimize the design parameters by the minimax method. Optimality criteria are the tractor vehicle steering speed at straight-line motion and lateral acceleration of the trailer for the curvilinear motion. The calculations were performed using the spatial scheme, the coefficients of wheel slipper resistance and the trailer drawbar length, mass ratio for trailer and vehicle, location of cargo in the trailer.
The article contains the results of the design study of thermal-hydraulic characteristics of the rotary frame heat exchanger with conical heat transfer elements. Calculations were carried out in a finite element package Ansys CFX 13. The authors analyzed the influence of switching devices on the efficiency of the heat exchanger.
This paper describes how to improve the construction of the splitter of valve of air exchange system on vehicles. To optimize the operation of the valve at G = 2000 kg / h, ДP = 0,36 kg/cm2 were designed several constructions of the splitter. The paper presents two options for modifications of the splitter of valve with the best results of acoustic calculations.
The paper presents the results of the studies of developed mathematical model of straight line motion of the four-axle all-wheel drive vehicle with individual adjustable electric wheel drives, allowing justification of the system requirements for an automatic adaptive control of electric transmission of the vehicle, reducing the influence of negative factors when moving through a single sinusoidal obstruction.
The article describes issues of simulation of ABS and traction-control system based on developed quasi-spatial simulation vehicle model, which corresponds to experimental four-wheel-drive vehicle with individual electric wheels.
The authors offer the methods of the plasma-chemical pyrolysis of hydrocarbon organic raw materials on the basis of arc plasma device of low power for manufacture of fuels and energy from organic hydrocarbons by the method of plasma conversion which favourably differs from known before installations.
The paper describes the ways for creation of hardware and software for automated multi-parameter optimization of internal combustion engines control, operating on the quasi-stationary modes as a part of a vehicle, in order to reduce toxicity and improve fuel economy. The authors denote the choice of method for solving the problem and main results.
The article presents a mathematical model of hydraulic drive of a fan for cooling automobile engine, equations, block diagrams of elements of the hydraulic system. As the flow model to describe the heat transfer process the model of ideal mixing is adopted. The authors got the mathematical model of the hydraulic drive and the corresponding transients.
The article considers the possibility of usage of alternative fuels based on hydrogen. The authors performed the analysis of the advantages and problems of hydrogen fuel usage, and considered the concept of an engine with direct injection of hydrogen into the cylinder, efficiency and environmental friendliness.
The article examines the intellectual systems of electrical supply of the vehicles, using optimal algorithms of operation providing decrease of engine exhaust gases toxicity and fuel consumption by the engine for generator drive, stability of onboard network voltage and specified charging state of the battery. There is given the classification of intellectual adaptive systems of electrical supply depending on solved problems. The authors present the examples of the algorithms reducing emissions into the atmosphere and vehicle fuel consumption.
In article quality and reliability of systems of an electrical supply of independent objects is considered. Quality of the electric power which various infringements and distortions of the form of feeding pressure influence first of all concerns concept of quality. We will especially notice that the electrical supply depends on quality of the electric power and reliability of an electrical supply, according to the developed technical practice, the basic means of maintenance of reliability and quality of an electrical supply are sources of an uninterrupted food and the best indicators of reliability of an electrical supply it is possible to receive, using reserved systems with architecture «a power file».Keywords: hybrid vehicle, electro-mechanical complex, electrical converter, stop-start system, regenerative braking, finite element method, thermal process, electromagnetic process, starter-generator unit, rotor, stator.
The article considers the process of gear shifting by friction clutches in the tractor transmission with various ratios of gear overlapping. The authors developed the mathematical model of the tractor unit acceleration during gear shifting by friction clutches, based on which obtained the analytical dependence for determination of the time of slipping and slipping work of engaging clutch for any ratio of gear overlapping and acceleration time of the tractor unit on a given gear.
The conducted analysis of methods of reception of fuels and energy from organic raw materials allows to make a conclusion that application of plasma converters provides rupture of intermolecular communications of hydrocarbonic raw materials by fast pyrolysis of initial components with the subsequent synthesis of the new substances differing by physical and chemical properties from the initial.
In relation to the dynamical system, designed to study the longitudinal oscillations of the frame of tractor wheel vehicle, the authors developed the mathematical model of its motion on the basis of traditional methods and use of formal methods. The authors give the comparative evaluation of these methods.
Tha paper contains the proposals on the organization of the development and deployment of intelligent transportation systems. Rational directions of creation of telematic transport systems are justified: development of system architecture, invariant to functional tasks, and the development of components, ensuring the solution of specific functional tasks.
The paper presents the multidimensional scale for assessment of physical properties and performance properties of engineering products based on the methods of fractal geometry and results of scanning probe microscopy.
The papers presents the algorithm of computer program for calculation of the coefficients used in calculating dimension chains regarding the chosen theoretical law for approximation of the empirical curve.
The paper describes how to improve the accuracy and performance of gear cutting operations by changing the form of tolerance.
The article deals with mechanical properties of powder materials after multicomponent diffusion saturation of Cr, Ni and Mo.
The article presents the method of definition of parametrical reliability of the spindle units, based on the probabilistic approach to study of the target parameters changing under the influence of number of factors during operation.
The article is devoted to the promising area of design tools to improve the quality of internal threads shaping under planetary processing on CNC machines.
The article presents the summary of the comparative analysis of the process-dependent parameters of tubes bending by pushing through the steeply curved canal of the matrix.
The article highlights the problems arising during processing of parts with a complex contoured profile. There are considered all the stages of formation of the geometrical image of the machine with variable elements. The authors formed a complex of 3D-geometric models of Finc Tech SMV-450-H3 milling machining center, which allows to quickly edit the components without changing the overall structure of the model.
Quality management methods for products at stages of technical and working projects are considered. At the stage of engineering design in improvement in quality standardization and unification indexes have major importance. At the stage of execution plan for detection of weak places in a products design there is applied a method of optimization of technical products on the basis of a simplex method. As a result of a preliminary estimate of prospective quality of products and making changes in the documentation, labour input and the cost of obtaining of quality products during their manufacture considerably decrease.
Investigation of the fine structure of infrasound and electromagnetic fields (the spatial distribution of amplitude and energy parameters) in a confined space will solve fundamentally new problems to reduce the negative effects of these fields on humans.
This paper presents an innovative method for determining the physical and mechanical characteristics of the object, allowing to improve the quality of cast structures designing.
On the basis of the developed innovative methods of environmental planning and determination of physical-mechanical characteristics of cast structures (patent No. 2431819 of 20.10.2011 Bull. № 29), first obtained the structures with the specified physical and mechanical characteristics, ensuring minimal negative impact on the environment in the life cycle.
This paper presents research and methodology of choice of colloidal graphite coatings for high-carbon steel workpieces. The authors give a comprehensive study of colloidal graphite surfaces. The method of optimal choice of colloid-graphite coating considers physico-chemical and technological properties of the coating. Selected colloidal graphite coating on the proposed method were used in the calibration process for semi bearing rings.
This paper presents an algorithm for the calculation of the coefficient (index) of friction at compression of the ring in hot deformation. The calculation considered the temperature-speed parameters of hot deformation: temperature of the workpiece, temperature of dies, the thermophysical properties of material of a workpiece and a die, parameters of equipment. Calculated curves for μ = μ (r). The authors give the comparative results of calculations and experiments on compression of ring samples in hot conditions.
The authors investigated the effect of contact friction on the flow of a material in combined process with a running a hotbed of deformation. The different ways of defining the boundary conditions of the contact between the deformable material and surfaces of the instrument. Numerical modeling of the process was conducted using software package QFORM, based on the finite element method. The process under consideration is complex. The height of bulges formed at the core of the piece, taken as a control parameter when performing a comparative analysis of the results of computer simulations with experimental results. Investigated is the influence of the friction factor, which determines the height of the bulges, its shape and material flow. The results of computer simulation are compared with experimental results. The authors achieved a good qualitative and quantitative agreement.
The article describes the technology of metal finishing by surface-plastic deformation to improve the quality of the surface layer. The authors conducted the analysis of the mutual compatibility of geometrical and physical-mechanical characteristics of the surface after ultrasonic machining and gave practical advice on quality management of received products.
The article considers the method of selecting of grinding mode at the operation design stage. The authors developed the mathematical model of process of grinding of a bearing ring. There are obtained numerical values of the error of machining of internal surfaces of bearing rings for different schemes grindings.
The article presents the results of the study and detailed analysis of the dependence of accuracy of the shape of outer ring groove of the double-row roller bearing of adjustment parameters during grinding by cup circles for incision.
The paper presents the results of study of physical and mechanical properties of the surface layer of curved surfaces treated by grinding by the method of cup circle intersecting axes.
The paper considers an approximate analytical method of solution of the problem on contact interaction of the two-layer flexible coating of a solid cylinder with another solid cylinder (without coating). The method is based on the assumption that contact pressures vary by cosine law and geometric conditions of the contact comply in three points of contact area.
The paper presents the decisions of equations of N. A. Slyozkin of steady motion in te laminary mode of incompressible viscous fluid under axisymmetrical flow. On the basis of exact decision of equation of Slyozkin (of Rikkaty-type) there is shown multiplicity of decision of this equation, thus physical sense has a small number of decisions only. The simplest case of unvortex decisions is considered, for which steam-lines can be circumferences, ellipses, parabolas, hyperbolae and lines. These flows are not stream.
The stability of a rectangular plate of variable thickness, being in a supersonic flow of gas, was investigated by application of the linear piston theory. The critical velocity of the gas flow was calculated. The problem of thickness distribution optimization was solved.
Based on behavior of structural materials under non-isothermal cyclic elastoplastic deformation the authors established a system of mathematical modeling of cyclic loading of structures using finite elements and self-correcting method.
The article is devoted to the features of process of enhancement of management by industrial enterprises. Problems of development of management system and approaches to the decision of these problems are considered.
The paper considers the possibility of using concessions in Russia. The main problems encountered by the use of this form of cooperation between business andgovernment and offered direction to alleviate the problems are identified.
This article examines innovative activity of industrial corporations and their role in the emergence of the market of new products and technologies, its place in the innovation business.
The role of small innovative business is very important in today's economy, because it is primarily the creation of new business, building on the innovative idea or technology that can provide sustainable competitive advantage.
The strategic perspective of domestic machine-building is difficult to predict in terms of the transition state of the economy, as well as in moments of crisis turmoil at the global economic space.
This article provides an overview of the currently existing innovative models revealed the feasibility of their use, given the clear distinction in terminology.