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Savchenko E.V.,Chernihiv State Technological University
Strength of Materials | Year: 2013

The complex procedure of multicriterial optimization of cylindrical shells with the layers from fiber-reinforced viscoelastic composite materials is presented. © 2013 Springer Science+Business Media New York. Source


Filonenko S.,National Aviation University | Kosmach A.,Chernihiv State Technological University
Aviation | Year: 2013

The paper considers the results of modelling acoustic emission signals that form under variations in the rotational speed of a friction pair made of a composite material. It is found that the energy accumulation in acoustic emission signals that form relative to time takes place in accordance with linear law under normal wear of a friction pair. If the rotational speed of a friction pair increases, the rates of accumulated average energy and accumulated total energy of the acoustic emission signals that form also grow. The resulting acoustic emission signals have both accumulated average energy and accumulated total energy. A comparison of these two types of energy is conducted. It is shown that the application of data averaging reduces the rate of the accumulated energy of the acoustic emission signals that form. Copyright © 2013 Vilnius Gediminas Technical University (VGTU) Press Technika. Source


Vinnikov D.,Tallinn University of Technology | Zakis J.,Tallinn University of Technology | Husev O.,Chernihiv State Technological University | Strzelecki R.,Electrotechnical Institute Warsaw | Strzelecki R.,Maritime Academy of Gdynia
Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC | Year: 2012

This paper presents a new step-up DC/DC converter topology. The converter is intended for applications that require a high gain of the input voltage and galvanic isolation, i.e. power conditioning systems for alternative energy sources such as fuel cells. The operation principle of the converter is explained by help of a steady state analysis. Simulation results are presented and analyzed. Finally, the experimental results are provided and a modification possibility of the proposed converter is discussed. © 2012 IEEE. Source


Filonenko S.,National Aviation University | Kosmach A.,Chernihiv State Technological University
Aviation | Year: 2014

The model of acoustic emission signal formation during friction and wearing of surfaces of composite materials was examined. The forms of acoustic emission resultant signals were shown. The regularities of parameter change in acoustic emission resultant signals with an increasing rotation speed were determined according to the results of modeling. It was found that theoretical and experimental results of acoustic emission signals registered during friction of composite material surface layers agree well. © 2014 Copyright © 2014 Vilnius Gediminas Technical University (VGTU) Press. Source


Husev O.,Tallinn University of Technology | Husev O.,Chernihiv State Technological University
Technical Electrodynamics | Year: 2013

Peculiarities of DC/DC converters based on the qZS-network were considered. Control system of the converter is described. By means of small signal model of transfer function the stability analyzes was performed. The results of the analytical analysis and experimental investigation showed that a DC/DC converter based on the qZS-network has limited but predictable stability margin. The area of coefficients of PI-regulator in which the system is stable was found. It was shown that stability margin depends on coefficients of PI-regulator and operation point of the converter. Source

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