The conditions under which the chaotic dynamics is formed during the materials processing by cutting are analyzed. In the previous studies, in case of loss of sta-bility of the cutting process, limit cycles or invariant tori are generated in the neighborhood of the equilibrium system. Contrastingly to these studies, the case when the tool properties are such that a nonlinear positive feed-back is formed by flexural deformations is considered. A mathematical system model is provided for this case. On the basis of the numerical simulation, using the MATLAB application program package, the dynamic model parameters effect is explored under the conditions of the chaotic dynamics formation. The research results show that with increasing the parameters characterizing the formation of a positive feedback, the system undergoes a series of period-doubling bifurcations in the system of strange attractors. They are located in the vicinity of the equilibrium points and have a limited area. It is shown that the tool chaotic oscillations lead to the chaotic work surface forming, therefore, in the application sector, it is necessary to choose the parameters under which the chaotic dynamics is not formed. Although the considered examples relate to the cutting process, the obtained results are of general validity for the dynamic systems interacting with various environments, for example, with a tribological environment.

The main interest of designers is not only to determine the amplitudes of tillage forces but also the type of their distributions under different soil mechanical properties with object of achieving reliable designs. Whereas, the deterministic design approach consists in achieving designs without considering the randomness of the design parameters that may lead to non reliable designs. In this work, we establish a statistical study on the randomness of the soil properties in collaboration with Cranfield University. This new study can be considered as a useful database for agricultural equipment design fields. Here, we take into account the uncertainties of soil mechanical properties that have big effects on tillage forces. The tillage forces are calculated in accordance with analytical model of McKyes and Ali with some modifications to include the effect of both soil-metal adhesion and tool speed. The distributions of soil-tool forces are next established to design soil tillage equipments such as shank chisel plow. The reliability index is then calculated using two deferent methods (Monte Carlo method and Hasofer and Lind approach). The Hasofer and Lind approach provides the structural reliability level with a low computing time relative to the Monte Carlo approach

The purpose of this paper is to present the basic principles of the construction and operation of monitoring systems of the tool condition, and the machine tooling backup man-agement in the computer-aided manufacturing. The proposed approach is focused on creating conditions for the effective tool state management. For this, the application of the intelligent host control module on the basis of the interactive electronic technical documentation of the mechatronic technological object is proposed. Valuation principles of the tool life fuzzy boundary are fully considered on the basis of the of fuzzy knowledge theory. Three methods for estimating the parameters of the resistance fuzzy boundary are presented. A neural network which operates on the basis of the developed fuzzy prediction rule base of the cutting tool wear depending on the instrument status and its impact on the part cutting accuracy is built. The results obtained are applicable in the sphere of the industrial engineering.

The purpose of this study is to investigate the influence of the alcohol atomicity on the self-organizing control capability in order to achieve the wearlessness effect in the friction pair of steel-steel. The copper-containing lubricant compositions are prepared in the electrolysis of the aqueous solutions of polyatomic alcohols with a copper anode in the ultrasonic field (complex processing). The laboratory testing of the tribological behavior of the lubricating compositions is carried out on four-ball machine using balls of SH-15 steel according to GOST 9490-75. Tribological properties of steel-steel friction pair are studied on the front friction machine AE-5. The copper particle size is defined by the sedimentation analysis method using the disk centrifuge of CPS Disc Centrifuge Model DC 24000 brand in the aqueous solutions of polyatomic alcohols. The topographic studies of the nanocluster metal structures are performed with the scanning probe microscope (SPM) Solver P 47 H in the semi-contact mode of the atomic force microscopy (AFM). The topographic investigations of a servovit film are conducted with the use of the scanning atomic force and power microscope of Compact AFM PHYWE . It is shown that the time increment of the integrated processing of a water-alcohol mixture leads to the strengthening of the antiwear properties of lubricant compositions. Increasing alcohol atomicity facilitates the implementation of the selective transfer, thus reducing wear and the transition time in the wearlessness mode. The resulting molecular ligand copper clusters with an average size of 25 nm are characterized by high uniformity. Thus, the friction track represents rather ironed surface with low roughness.

The research results on improving reliability of the finishing-strengthening centrifugal rotary processing are presented. The research subject is the formation of the finishing and strengthening centrifugal rotary processing (FS CRP) reliability provided by a reasonable coupling of the technological modes and operating environment characteristics. The research objective is to improve efficiency and reliability of the finishing-hardening centrifugal rotary processing with studying the arising failures based on the development of a set of the adequate theoretical processing patterns. The refined theoretical patterns of the finished part surface layer indices forming - the extent and depth of hardening, are obtained. The analytical forecasting methodology of the finishing-hardening centrifugal rotary processing reliability with the following parameters: the coefficient of the instantaneous scattering of the controlled variable, the offset coefficient of the controlled variable, and the coefficient of the process marginal accuracy, is developed. It is established that the FS CRP process provides obtaining the required parameters of the workpiece surface quality under the processing within the tolerance values in a certain range of the technological mode change and the operating environment characteristics. The design technique for the FS CRP processes with allowance for their reliability is developed.

The work objective is to study a mathematical model of the synchronous hydromechanical brush actuator of the airdrome sweeper driven by two hydraulic motors based on the throttle flow divider of non-spool-type with plunger setters. The main task is to determine the effect of various design and operational data of a synchronous hydraulic drive of a mobile technological machine on its functional efficiency. A method of the theoretical research of an actuator mathematical model is used. The simulation of the brush synchronous hydro-drive system is based on the theory of the modified volume stiffness of the hydraulic system that allows simplify modeling and make a rapid analysis of the drive performance under study, considerably shortening the timeline of the study. The research results prove that the throttle flow divider of non-spool-type with the plunger regulating element allows providing the required properties of the synchronized system. The design parameters of the flow divider having an essential impact on the synchronous hydraulic system operation are recognized, and ways of its improvement are specified. The research results can be used in design and improvement of the synchronous hydromechanical drives of mobile technological machines.

As the subject of work, are mathematical mod-els that reflect the dynamics of vertical move-ment of the vehicle, taking into account the nonlinear transformation of the angular motion of the wheel in the forward movement of the center of mass of the wheel, the contact wheel and the road. The article provides a synthesis of models, reflecting the dynamics of vertical os-cillations of the vehicle. The difference of the present model from existing consists in taking into account the dynamics of angular motion, resulting in a model associated with the state coordinates the angular motion of the wheel. The aim of this work was to increase the effec-tiveness of the management of modern vehi-cles, so in addition to the synthesis model, the example analysis of the dynamics of a specific vehicle which was organized by the contempo-rary pas-passenger electric locomotive EP. The output of the analysis phase portraits reflecting the dynamics of the vertical motion of the cen-ter of mass of the wheel and the phase portrait, reflecting the dynamics of vertical oscillations of the body. In General, the obtained results allow to make infer-ence about the connectivity of the dynamics of vertical and angular move-ment in the TRANS-tailor the tool and, as a consequence, the effect of the rate of angular movement in the area of wheel contact with the road (rail). As the field of application of the results, see the synthesis of control systems of vehicles, taking into account the revealed relat-edness.

The work objective is the development and validation of a new type micromechanical gyroscope which allows maintaining the transformation of angular rotation velocities of the supporting base into electrical signals simultaneously about two rotation axes. A new micromechanical gyroscope that both preserves positive qualities of the known Russian and foreign analogues, and differs in its enhancement due to converting the angular rotation velocities of the supporting base into electrical signals simultaneously about two rotation axes, is proposed and described. The presented technical solution is protected by the Russian Federation patent for invention in 2015. The proposed gyroscope can be applied in the navigation systems, reference systems, control systems of various mobile objects in the aviation, rocket and space technology, robotics, instrumentation, tool engineering, transport, etc.

The work objective is speeding the covariance matrix converter of the adaptive antenna array interference by reducing the number of operations performed. A problem of developing an aprior information inversion algorithm relying on the Hermitian nature of the reversible matrix is considered. The proposed algorithm is based on a bordering method in contrast to the well-known algorithms based on method of Gaussian-Jordan elimination. Because of complexity and a large operation number, Gaussian-Jordan method does not allow realizing the real time signal processing in computing systems of the adaptive antenna arrays that are widely used in communication, radiolocation, and radio navigation systems. The proposed algorithm extends a well-known bordering method by taking into account Hermitian nature of the covariance interference matrix, and allows developing an algorithm based on the recursive relations. An obtained gain in amount of calculation is no less than 25% comparing to the method of Gaussian-Jordan elimination. The calculation amount decrease and a more simple form of relations used for the matrix inversion algorithm elaboration allow developing a more simple design of the adaptive antenna array processor for the matrix inversion.

The development of methods and algorithms for solving a routing problem is being implemented over the years, but it is still a topical problem. This is, primarily, due to the fact that this problem is NP-complete, and to develop a universal algorithm for finding an exact optimal solution during a reasonable time is difficult. In this regard, in order to reduce the algorithm time complexity (ATC), the development of sequential and parallel bionic algorithms for solving the transportation problems based on the evolutionary strategies is prospective. The bionic algorithms (BA) have proved their efficiency at the solution of the time-consuming tasks of optimization, approximation, and intellectual data processing. Benefits include the possibility to perform the genetic and evolutionary search, as well as the fact that BA consist in parallel generation of the quasioptimal alternative decision sets with possible "migration" of decisions between these sets. Schemes that differ from the known ones in the outlining structure and recording the parameter variation are proposed for the bionic search simulation. The investigation of the developed bionic algorithms for solving transportation problems show the advantage in the solution quality compared to the known methods. The developed algorithms allow obtaining a set of alternative quasioptimal results with the polynomial time complexity. The transformation of the population size during the transition from one iteration to another in the process of the bionic algorithm operation is presented.

The work objective is to define the properties of the mobile road-building machinery (MRBM) traffic flows for the control effectiveness improvement. The results of the system analysis of the MRBM control tasks are presented. Their solution concept is presented; the traffic control problem formalization for the mobile road-building machines under the ever-changing conditions of movement is performed. For the first time, system and structural status assessment criteria for MRBM are formulated; the control concepts of the mobile objects groups are analyzed; recommendations for selecting the type of control are given. Mathematical models of the traffic flows establishing the dependence of the motion speed on the traffic density, and a mathematical model of the traffic route optimization for the mobile road-building machinery are presented. Strategies of the adaptive and intelligent control of the mobile objects groups of different numbers, as well as the results of the regression analysis of the mobility objects motion model are presented.

A problem of selecting the controlled parameter values of the combine harvester work tools is considered. Models describing the harvesting quality factor dependencies of the external agents are analyzed. The need of a new approach to modeling the technological adjustment process of the harvester in the field which takes into account the fuzzy information on the environmental factors, its approximate character, as well as an expert method of generating information, is justified. To describe the environmental factors and the performance indices, linguistic variables are introduced, their membership functions are developed, and production rules are formulated. The fuzzy inference process is illustrated by an example of selecting the beater rate speed. A knowledgebase and an inference engine that form the expert system basis are created. The use of such a system in the field allows reducing the process downtime and crop waste. A practical implementation of the developed model is the creation of the software for the automated problem solution of the technological adjustment of the harvester in the field.

The research subject is an analytical modeling and multivariate analysis of the straw wad destruction by the cutting cylinder with radial fingers and a horizontal axis of rotation. The work objective is the detection of regularities for straw wad destruction under the geometric and kinematic parameter variation of the gear for wad breaking. The research objective is the impact assessment of the geometric parameters, composition and kinematics of the straw wad destroyer on its performance indices. The investigative technique is an analytical modeling. The effect of the fingers length, their number, cylinder chopper rotation velocity, its arrangement in respect to the straw wad, straw wad conveyorized infeed on the straw wad destruction process is estimated. It is found how the factors considered and their parameters affect the direction and range of the culm ejection from the drum destroyer fingers taking into account how the flying straws hit the next element of the operative parts system. The spatial arrangement rationality of the drum destroyer, its geometric and kinematic parameters for the processing properties of straw bales, and the specified variability interval of the performance values of the technological device is preevaluated. It is established that the process of bale destruction, the movement of straws on the fingers, and the trajectory of their movement in the air, depends significantly on the operating width of the finger gripping the straw wad.

The work objective is a water movement modeling in the plant xylem allowing for the hydraulic loss on a single bordered pit torus, as well as on the pore population. However, as it follows from a number of publications, root pressure is not a mechanism providing water rising in plants. A model representation is based on the assumption that the main reason for rising water in plants is the surface tension in the meniscus of the xylem capillary. At this, it is necessary to take into account the xylem structure features of the needle-leaved and broadleaved trees. The equation to calculate the water rise in the xylem capillary of plants with tracheidal conductance is derived with account for the anatomy structure of the tracheids and bordered pores. The equation allows determining the change in the hydraulic losses in the movement of water through a single bordered pore and through the pore population taking into account the orientation of the latter. The model allows calculating the height of the water rise in the xylem capillary. It is shown that an increase in the diameter of the tracheid cavity and in the diameters of the bordered pore and torus, ceteris paribus leads to the rising of the hydraulic losses.