Institute for Problems of Mechanical Engineering

Saint Petersburg, Russia

Institute for Problems of Mechanical Engineering

Saint Petersburg, Russia
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Bakranova D.I.,Kazakh-British Technical University | Kukushkin S.A.,Institute for Problems of Mechanical Engineering | Nussupov K.Kh.,Kazakh-British Technical University | Osipov A.V.,Institute for Problems of Mechanical Engineering | Beisenkhanov N.B.,Kazakh-British Technical University
MATEC Web of Conferences | Year: 2016

The nanolayers of single crystal SiC were grown on the surface of a high-resistance n-type silicon substrates by replacement of the atoms in the crystal lattice of silicon on the carbon atoms at the temperatures of 1250, 1330 °C and CO gas pressures 264, 395 Pa, respectively. The formation of crystalline β-SiC phase in films by electron diffraction and Raman spectroscopy techniques was shown. The SiC films are epitaxial and do not contain twins on the surface. By Atomic Force Microscopy is shown that two set of SiC films have pyramidal and step-like structure of the surface with clear-cut fragmentation of grains with sizes between 100 and 200 nm, and this is due to the composition of carbon and silicon atoms in the layer. Two set of SiC films have a granular surface structure with indistinct grain fragmentation. The influence of synthesis condition on the microstructure of film surface is discussed. © Owned by the authors, published by EDP Sciences, 2016.


Fradkov A.,Institute for Problems of Mechanical Engineering | Tomchina O.,Saint Petersburg Machine Building Institute | Tomchin D.,Institute for Problems of Mechanical Engineering
Journal of Sound and Vibration | Year: 2011

Methods of passing through resonance zones in mechanical systems are discussed and a new method based on the speed-gradient energy control of two subsystems (rotor and support) is presented. Two typical problems of passing through resonance for one- and two-dimensional motion of the support are posed and analyzed by computer simulation. The control algorithms based on the speed-gradient method and averaging allow one to significantly reduce the required level of the controlling torque. The proposed algorithms have a small number of design parameters. Compared with the known algorithms the proposed ones are more simple for design and exhibit stronger robustness properties. © 2010 Elsevier Ltd. All rights reserved.


Fradkov A.L.,Institute for Problems of Mechanical Engineering | Razuvaeva I.V.,Saint Petersburg State University | Grigoriev G.K.,Saint Petersburg State University
IFAC Proceedings Volumes (IFAC-PapersOnline) | Year: 2010

In the paper the basics of passification based adaptive control theory for stochastic continuous-time systems are introduced. Conditions for the mean square dissipativity of adaptive stabilization systems for a linear plant under coordinate-parametric white noise disturbances are obtained. A linear adaptive regulator with adaptation algorithm designed by the passification approach is proposed. The number of plant inputs may differ from that of outputs. The proof is based on the construction of a quadratic stochastic Lyapunov function. (In the case of purely parametric perturbations, the obtained conditions are known to be necessary and sufficient for the existence of a Lyapunov function with these properties.) Ultimate mean square boundedness (Levinson dissipativity) conditions for the designed closed loop system are obtained; it is shown that, in some special cases, the dissipativity of the closed loop system is preserved under white noise perturbations of arbitrary intensity. Stochastic G-passivity for nonsquare systems is introduced and necessary and sufficient conditions for strict stochastic G-passifiability are formulated. © 2010 IFAC.


Efimov D.,French Institute for Research in Computer Science and Automation | Fradkov A.,Institute for Problems of Mechanical Engineering | Iwasaki T.,University of California at Los Angeles
Automatica | Year: 2013

The mechanism of entrainment to natural oscillations in a class of (bio)mechanical systems described by linear models is investigated. Two new nonlinear control strategies are proposed to achieve global convergence to a prescribed resonance mode of oscillation within a finite time. The effectiveness of the proposed methods for resonance entrainment is demonstrated by examples of computer simulation for linear and nonlinear systems. © 2013 Elsevier Ltd. All rights reserved.


Efimov D.V.,Supelec | Fradkov A.L.,Institute for Problems of Mechanical Engineering
2007 European Control Conference, ECC 2007 | Year: 2015

The problem of oscillations stabilization for the case of unknown natural frequency of vibration machine is considered. An algorithm of the problem solution for the second order linear model of the machine with uncertain parameters, external disturbances and partial noisy measurements is proposed. © 2007 EUCA.


Efimov D.V.,Supelec | Fradkov A.L.,Institute for Problems of Mechanical Engineering
2007 European Control Conference, ECC 2007 | Year: 2015

An approach for estimation of on-line static measurements errors is proposed. The obtained solution is based on adaptive observer design approach. The solution can be used for measuring instruments calibration. The advances of proposed solution are demonstrated via computer simulations for several examples. © 2007 EUCA.


Denis E.,University of Bordeaux 1 | Fradkov A.L.,Institute for Problems of Mechanical Engineering
Proceedings of the IEEE Conference on Decision and Control | Year: 2010

The issue of spatially distributed systems regulation is studied on the example of lattices of linear oscillators. The problem of natural wave stabilization is formulated and solved applying passivity-based approach. By natural wave stabilization we understand the desired energy and phase assignment for oscillators (the waves frequencies can be chosen from the lattice natural spectrum). The proposed controls are applied to 1D and 2D lattices confirming efficiency of the proposed solution. ©2010 IEEE.


Efimov D.,University of Bordeaux 1 | Fradkov A.,Institute for Problems of Mechanical Engineering
IFAC Proceedings Volumes (IFAC-PapersOnline) | Year: 2011

The development of adaptive observer techniques for nonlinear systems in the output canonical form is proposed applying additional impulsive feedbacks in the observer equations. The stability of new impulsive adaptive observers is investigated. It is shown that under some conditions the proposed impulsive feedbacks can improve the rate of the observer convergence or relax the requirement on persistency of excitation, which is frequently needed to ensure convergence of the parameter estimates. The proposed feasibility conditions include positivity of dwell time (boundedness of impulse frequency) and solvability of some Lyapunov-like hybrid matrix inequalities. The results are illustrated by simulation for three examples (including a single link flexible joint robot example). © 2011 IFAC.


Bobtsov A.A.,Saint Petersburg State University of Information Technologies, Mechanics and Optics | Efimov D.V.,Institute for Problems of Mechanical Engineering
2009 European Control Conference, ECC 2009 | Year: 2015

State observer design procedure is proposed for nonlinear locally Lipschitz systems. Possible presence of disturbances is taken into account. The solution is based on logic-based control approach applicable to nonlinear systems with bounded solutions. © 2009 EUCA.


Bobtsov A.A.,Saint Petersburg State University of Information Technologies, Mechanics and Optics | Pyrkin A.A.,Institute for Problems of Mechanical Engineering
International Journal of Adaptive Control and Signal Processing | Year: 2012

In this paper, a new approach for cancelation of a multiharmonic disturbance is proposed. Compared with a number of known results in this paper, the disturbance cancelation problem is solved when the output variable is measured only, a relative degree of the plant is arbitrary and the control channel has delay. The numerical example is presented to illustrate the theoretical result. The reaction wheel pendulum on a movable platform is considered as the plant to demonstrate that the proposed approach is realizable and can be plugged in practice. The second goal is the development of mechatronic applications for use in education. Copyright © 2011 John Wiley & Sons, Ltd.

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