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Andriyanov A.I.,Bryansk State Technical University
Journal of Computer and Systems Sciences International | Year: 2016

The nonlinear dynamics of a closed automatic control system with sinusoidal pulse-width modulation is analyzed. As a result of the studies, maps of dynamic modes and bifurcation diagrams are constructed. New types of Border-collision bifurcations are discover. The concept of a design mode for systems of the considered class is introduced. The results of the work make it possible to extend the classification of Border-collision bifurcations. © 2016, Pleiades Publishing, Ltd.


Demidov A.A.,Bryansk State Technical University | Volkov D.V.,Moscow State University
Physics of the Solid State | Year: 2011

The magnetic properties of an antiferromagnet with trigonal symmetry, namely, HoFe3(BO3)4, have been investigated theoretically. The calculations have been performed in the molecular field approximation and in the framework of the crystal field model for the rare-earth subsystem. Extensive experimental data on the magnetic properties of HoFe3(BO3)4 have been interpreted and good agreement between theory and experiment has been achieved using the obtained theoretical dependences. The spontaneous spin-reorientation transition and the spin-reorientation transition induced by a magnetic field B {norm of matrix} a from the easy-axis to easy-plane state, as well as the spin-flop transition in a magnetic field B {norm of matrix} c, have been described. It has been shown that the spontaneous spin-reorientation transition is a magnetic analog of the Jahn-Teller effect. The temperature dependences of the initial magnetic susceptibility at temperatures ranging from 2 to 300 K, the nonlinear curves of magnetization for B {norm of matrix} c and B ⊥ c in a magnetic field up to 1. 2 T (which indicate the occurrence of first-order phase transitions), and their evolution with variations in the temperature have been described, as well as the temperature and field dependences of the magnetization in a magnetic field up to 9 T. The parameters of the trigonal crystal field for the rare-earth ion Ho3+ and the parameters of the Fe-Fe and Ho-Fe exchange interactions have been determined in the course of interpretation of the experimental data. © 2011 Pleiades Publishing, Ltd.


Andriyanov A.I.,Bryansk State Technical University
2016 International Siberian Conference on Control and Communications, SIBCON 2016 - Proceedings | Year: 2016

The paper proposes a new version of control system for a buck converter based on target-oriented control with correction function parameters adaption, providing predefined nonlinear dynamics behavior of the converter. The proposed control system allows withdrawing parametric synthesis from the design process of the considered device class and this way helps to avoid a variety of collisions arising on the stage of design arrangement. The correction function parameters adaption technique based on Nelder-Mead method is presented. Mathematical modeling of the considered system has been implemented to prove the efficiency of the given control algorithm. The approach described in the paper can be applied to nonlinear dynamics control for a wide range of switching power converters. © 2016 IEEE.


Goncharov K.A.,Bryansk State Technical University
Proceedings of 2015 International Conference on Mechanical Engineering, Automation and Control Systems, MEACS 2015 | Year: 2015

A mathematical model of the distribution of tractive effort between drives of a belt conveyor with hydraulic couplings at their failure, taking into account the actual mechanical characteristics of joint operation of electric motors and hydraulic couplings is proposed. The example shows the advantage of the proposed model in the prediction of the working parameters of the conveyor on the failure of several drives. © 2015 IEEE.


Ozhereliev V.,Bryansk State Technical University
Proceedings of 2015 International Conference on Mechanical Engineering, Automation and Control Systems, MEACS 2015 | Year: 2015

This article presents the results of multi-year studies and experience in actuating devices construction, intended for mature raspberries take off with minimal damage for immature berries and laterals. © 2015 IEEE.


Syanov S.Y.,Bryansk State Technical University
Proceedings of 2015 International Conference on Mechanical Engineering, Automation and Control Systems, MEACS 2015 | Year: 2015

The article reveals theoretical dependencies of surface finish, waviness, microhardness and residual stress on spark eroding conditions. The main factors causing tool electrode wear and influencing the process efficiency are determined. On this basis theoretical dependencies of tool volume wear and process efficiency on process parameters are established. Thanks to these dependencies it is possible to carry out process control over parts surface layer quality characteristics, tool electrode wear and efficiency of spark eroding. © 2015 IEEE.


Filatov R.,Bryansk State Technical University
Proceedings of 2015 International Conference on Mechanical Engineering, Automation and Control Systems, MEACS 2015 | Year: 2015

This paper presents modern methods of technical diagnostics of forge machines as a whole and their main units. Analysis of the considered methods disadvantages is also carried out in the paper. © 2015 IEEE.


Medvedev D.M.,Bryansk State Technical University
Proceedings of 2015 International Conference on Mechanical Engineering, Automation and Control Systems, MEACS 2015 | Year: 2015

The results of developing the dependencies of wear intensity of machine parts surfaces from conditions of their final longitudinal turning and their final cylindrical grinding with radial supply based on the energy approach were presented. The models found give an opportunity to scientific improvement and creating of knowledge-intensive functionally-oriented techniques that allow increasing wear resistance of parts and their junctions in engineering industry workpieces. © 2015 IEEE.


Nevmerzhitskaya G.V.,Bryansk State Technical University
Proceedings of 2015 International Conference on Mechanical Engineering, Automation and Control Systems, MEACS 2015 | Year: 2015

The calculation of an axle-box with the VBP-15 bearing has been made. The contact pressure distribution for bearing parts in case of radial and axial forces application to an axle-box have been received. The optimization of a bearing roller form for maintaining a steady contact pressure along its length has been fulfilled. © 2015 IEEE.


Morozova A.,Bryansk State Technical University
Proceedings of 2015 International Conference on Mechanical Engineering, Automation and Control Systems, MEACS 2015 | Year: 2015

A procedure of the object set typing system of the parameter analytical field and the analyzed object identification profile formation is presented. The expediency of neural network technologies application for arbitrary objects bisubject qualimetric evaluation is substantiated. As an example, we consider the results of modeling the solution of fixing the main employees types and identifying experts, which reduces the cost of resources for recruitment to vacant engineering positions. © 2015 IEEE.

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