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УДК 004.942:62-756.62:621.869.888.8

Sydorenko Yu., Marynenko Ya.
The National Technical University of Ukraine «Kyiv Polytechnic Institute», Kyiv, Ukraine ( This e-mail address is being protected from spambots. You need JavaScript enabled to view it )


Abstract. In accordance with regulations of International civil aviation organization, all aircrafts witch transport 30 and more passengers must have special device to defuse home-made explosive bombs. Numerical methods of computer modeling are used for construct that devises more and more. Quantity of these methods depends on adequacy level of created mathematical model to real physical process. In this article questions of design adequacy mathematical model of deforming process of special device body under
inner pressure of home-made bomb explosion are discussed. Mathematical model adequacy is controlled by comparison modeling and experimental results. Computer program "ANSYS/LS-DYNA" was used for mathematical researching. Because of mathematical model have to consist as gas part (detonation product, air) as metal part (defuse home-made explosive bombs devise body) it was based on Lagrange-Euler method of describing behavior of different materials under shock. Expansion of detonation products was
described by JWL equation of state. States of metal defuse home-made explosive bombs devise body and paper bomb body were described by elastic-plastic material model with kinematic hardening plasticity "PLASTIC-KINEMATIC". In order to find values of that model parameters for the paper bomb body spatial experiments were carried out.
Conclusions: Mode of deformation definition method of defuse home-made explosive bombs devise was created. That method bases on adequacy mathematical model which describes home-made bomb explosion process which places inside of devise align.
Increasing of paper bomb body thickness to 16 mm leads to decreasing plastic deformation of outer surface of defuse home-made explosive bombs devise body by straight line low with a coefficient 0,002 1/mm and decreasing level expansion that surface up to 1mm. This decreasing is equal to 20% of maximum level expansion special device body when was exploded inside of than high explosive without paper body.

Keywords: explosion, explosive-technical expertise, mathematic modeling explosive process, detonation, TNT, LS-DYNA, homemade
explosive device, explosive deformation, explosive crashing, JWL, PLASTIC-KINEMATIC.

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УДК 62-525

Levchenko O.

The National Technical University of Ukraine «Kyiv Polytechnic Institute», Kyiv, Ukraine ( This e-mail address is being protected from spambots. You need JavaScript enabled to view it )


Abstract. Improving the efficiency of hydraulic drives in cyclic systems.
Purpose. To determine the advantages and disadvantages of the main methods to control hydraulic systems and the possibility of combining them.
Design/methodology/approach. It was considered the basic methods of productivity regulation of cycle action hydraulic devices and determined their advantages and disadvantages. It was detected the dependence of hydraulic system efficiency from the control methods of pumping units and their connection to the technological process of the system.
Findings. As a result it is proposed methodology for the analysis of the system in order to determine an effective method for regulating the pump unit, depending on the particular system.

Originality/value. It is found the structural division of hydraulic system units with taking into account the work modes of devices that are included in its composition.

Keywords: the regulation, the hydraulic system of cyclic operation, the pump unit, the technological process.

1. Gubarev A.P., Kozinec D.A., Levchenko O.V. MAS-1.0–uprowennoe modelirovanie mnogoprivodnyh gidropnevmaticheskih sistem ciklicheskogo dejstvija (MAS-1.0 - simplified modeling multidrive hydropneumatic systems in cyclic operation). Vseukraїns'kij naukovo-tehnіchnij zhurnal “Promislova gіdravlіka і pnevmatika” NO 4(10), 2005, pp. 72-77.
2. Gubarev A.P., Kozinec D.A., Levchenko O.V. Proverka logiki funkcionirovanija ciklovyh sistem gidravlicheskih i pnevmaticheskih privodov (Checking the logic of the operation of cycle systems of hydraulic and pneumatic actuators). Vseukraїns'kij naukovo-tehnіchnij zhurnal “Promislova gіdravlіka і pnevmatika” NO 3, 2004, pp. 64-69.
3. Gubarev A.P. Diskretno-logicheskoe upravlenie v sistemah gidropnevmoavtomatiki: Uchebnoe posobie (Discrete-logic control in systems of hydropneumoautomation: Textbook). Kyiv: ISMO, 1997, 224p.
4. Gubarev A.P. Prichinno-sledstvennaja model' obektov gidropnevmoavtomatiki – osobennosti i svojstva (The cause-and-effect model of objects of hydropneumoautomation - characteristics and properties). Kyiv: NTUU «KPI», 1999, 107p.
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P.Brusilovsky.- Twente University Press,Enschede, The Netherlands, 1997, pp. 341-355.
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УДК 539.4

Kryshchuk M., Orynyak A.
The National Technical University of Ukraine «Kyiv Polytechnic Institute», Kyiv, Ukraine ( This e-mail address is being protected from spambots. You need JavaScript enabled to view it ) ( This e-mail address is being protected from spambots. You need JavaScript enabled to view it )



Abstract. We consider boundary conditions of through-wall cracked pipe of different crack sizes and ratios of mean radius to thickness of wall under the action of combined loading pressure force and the cross point, which corresponds to the practical needs of enterprises of the energy profile. The author reveals the evolution of methods for calculation of elastic-plastic fracture with a crack pipe before demolition. Classification of methods of determining the limit of pipes with cracks. Given a reasonable analysis of existing methods of determination of J-integral and reference stress highlighted some significant advantages over other methods. In numerical solutions of problems of fracture mechanics for the pipes with continuous circular crack in the limit load applied software package Abaqus v.6.10 license Freiburg’s University IWM. The data which calculated of J-integral for the two types of pipes with cross cracks in the 12 different methods used in leading countries. The data obtained for the limit of pipe with one the factor loading bending moment, as well as the simultaneous action of internal pressure and bending moment.

Keywords: through-wall cracked pipe, leak before break, limit load, reference stress, J-integral.


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