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Stepanova L.N.,Chaplygin Siberian Research Institute of Aviation | Kabanov S.I.,Chaplygin Siberian Research Institute of Aviation | Kanifadin K.V.,Novosibirsk State University
Russian Journal of Nondestructive Testing | Year: 2012

The results of experimental studies of the weld-seam welding and cooling process in steel specimens using acoustic emission (AE) and strain gauging are presented. Deformation was measured by high-temperature strain gauges welded to specimens using spot welding. Temperature was mea-sured by chromel-alumel thermocouples. Measurements were performed with measured with an MMTC-64.01 microprocessor strain-gauging system and a CΠA+++-16.10 AE system. Computers of these two systems exchanged information. Residual strain deformations were recorded on a specimen after cooling of a weld seam. Metallographic studies of transverse sections, which were were cut out from the clusterization zones of a weld seam, confirmed the presence of cracks, pores, and faulty fusions. © Pleiades Publishing, Ltd., 2012. Source


Kareev A.E.,Parallels | Stepanova L.N.,Chaplygin Siberian Research Institute of Aviation | Tenitilov E.S.,Chaplygin Siberian Research Institute of Aviation
Russian Journal of Nondestructive Testing | Year: 2010

The main factors that affect the error of determining the coordinates of an acoustic-emis-sion (AE) signal source are considered. The influence of errors of determining coordinates ±Δxi and ±Δyi of piezoelectric-antenna transducers on the AE-signal localization accuracy are analyzed. It is theoretically and experimentally proven that the errors in the coordinates of the transducers substantially influence the AE signal localization accuracy, especially at a low sampling frequency of the analog to digital converter of the AE system's measuring channel and when low frequency AE transducers are used. © Allerton Press, Inc., 2010. Source


Petoshin V.I.,Chaplygin Siberian Research Institute of Aviation | Chasovnikov E.A.,Chaplygin Siberian Research Institute of Aviation
Journal of Applied Mechanics and Technical Physics | Year: 2011

Aerodynamic loads in problems of flight dynamics of passenger aircraft in stalled flow regimes are described using a mathematical model that includes an ordinary linear first-order differential equation. A procedure for determining the parameters of the mathematical model is proposed which is based on approximating experimental frequency characteristics with the frequency characteristics of the linearized mathematical model. The mathematical model was verified by tests of a modern passenger aircraft model in a wind tunnel. © 2011 Pleiades Publishing, Ltd. Source


Stepanova L.N.,Chaplygin Siberian Research Institute of Aviation | Bobrov A.L.,Novosibirsk State University | Kabanov S.I.,Chaplygin Siberian Research Institute of Aviation | Lebedev E.Yu.,Chaplygin Siberian Research Institute of Aviation
Russian Journal of Nondestructive Testing | Year: 2010

The techniques for acoustic-emission (AE) testing of cast parts (side frames and bogie bolsters) of a freight-car truck, which improve the reliability of evaluating their engineering state at different stages of the working cycle and decrease their repeated rejection, are considered. It is proposed to determine the degree of damage and the service life of cast parts on the basis of the analysis of AE-signal sources, which have the highest integral characteristics. © 2010 Pleiades Publishing, Ltd. Source


Berdnikov V.S.,RAS Kutateladze Institute of Thermophysics | Gaponov V.A.,RAS Kutateladze Institute of Thermophysics | Grishkov V.A.,RAS Kutateladze Institute of Thermophysics | Likhansky P.M.,Chaplygin Siberian Research Institute of Aviation | Markov V.A.,RAS Kutateladze Institute of Thermophysics
Thermophysics and Aeromechanics | Year: 2010

Time dependences of temperature distributions in a thin metal wall were studied experimentally under two conditions of convective heat transfer in a tank model. In the first case, the vertical working wall was heated from within due to a convective heat flux from the opposite wall heated monotonously, and it was cooled due to heat transfer to the ambient medium. Dependence of the temperature field on a thin wall at the stage of convective flow development was retraced with the help of the thermographic camera and thermocouple sensors. In the second case, the tank wall was heated uniformly by IR radiation from the outside, and non-stationary convective flow and volumetric liquid heating were formed inside. Time dependence of temperature distribution over the wall height is studied. It is shown that the flow structure and convective heat transfer in a fuel layer with free boundary are subjected not only to the buoyancy force, but also to the thermocapillary effect. The local features of the flow affect temperature distribution in a thin wall. © 2010 Pleiades Publishing, Ltd. Source

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