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Документ Численное моделирование течения вязкого газа через плоскую решетку колеблющихся профилей(НТУ "ХПИ", 2003) Гнесин, Виталий Исаевич; Быков, Ю. А.The numerical scheme of solving Reynolds-averaged Navier-Stokes equations for simulation of self -exciting oscillations of turbine blade row in transonic viscous gas flow is proposed. The method is based on second order Godunov's scheme. Comparison of numerical results with experimental and theoretical ones is givenДокумент Исследование НДС биметаллического вагонного колеса при технологических и эксплуатационных нагрузках(НТУ "ХПИ", 2003) Щепкин, Александр Витальевич; Андреев, Арнольд ГеоргиевичThis work is devoted to the research of the stress-strain state of an experimental bimetallic carload of the railway car during thermal assembly, optimization of a temperature field in a wheel during its heating for its fitting on to an axis, while in service during interaction with a rail and during heating of bandage during brakingДокумент Случайные колебания рам тележек вагонов метрополитена с учетом неровности пути(НТУ "ХПИ", 2003) Белоцерковский, Александр Борисович; Жовдак, В. А.; Черных, О. В.; Ярошок, Ю. А.The problem of definition of probability performances of the bogie frames of transit vehicles at random action is considered. The random action is caused by track irregularities. The external load is modelled by the stationary random process. The calculation is executed by the finite element method and the method of spectral representations. The program system COSMOS/M was used. The mode deformation of the system was investigated at the different models of the loadingДокумент Исследование нагруженности и усталостной прочности фланцевого окончания корпуса моста трактора Т-150К(НТУ "ХПИ", 2003) Никитенко, Ю. Д.Рассмотрены определения параметров нагрузок на ведущий мост, действующих при работе трактора Т-150К. Проведены многочисленные исследования прочности различных вариантов болтового фланцевого соединения и конструкции фланцевого окончания картера моста. Достигнуто повышение прочности корпуса моста ведущего и фланцевого болтового соединенияДокумент Свободные колебания системы, содержащей ферму Мизеса(НТУ "ХПИ", 2003) Абрамов, К. В.; Михлин, Юрий ВладимировичThemethod of nonlinear normal modes is used to study nonlinear dynamics of mechanical system with snap-through truss. Mathieu's equation is derived to study the motions stability. The domain of instability of nonlinear normal mode is obtainedДокумент Влияние структуры наплавленного материала на прочность и долговечность деталей машин(НТУ "ХПИ", 2003) Березняков, А. И.; Градыский, Юрий Александрович; Стадниченко, Н. Г.The influence of precipitation surface's temperature and the speed of surfacing cooling in the process of material's electromagnetic buiding-up on the fatigue durability and tribomechanical characteristics of the restoration surface were examined. The equation connecting the production of entropy with the speed of material cooling was reached. It was established by the way of experiment that materials thermomagnetic machining leads to the improvement of its structure. It is discovered that details restoration by electromagnetic method leads to the improvement of the structure and tribomechanical properties of the surfaceДокумент Напряженно-деформированное состояние составной матрицы штампа при полугорячем выдавливании металлов(НТУ "ХПИ", 2003) Лавинский, Денис ВладимировичThe analysis of thermal loading on strength and stiffness of semi hot extrusion die was considered in this article. The finite element method which is realized as program package SPACE-T was chosen as tool of solution. The contact interference was solved with contact layer method helpДокумент Узагальнена математична модель структурно зв'язаних механічних систем(НТУ "ХПІ", 2003) Автономова, Людмила Володимирівна; Бондар, Сергій Володимирович; Лавінський, Володимир ІвановичНадана математична постановка мішаної контактної задачі для структурно зв'язаних механічних систем з урахуванням фізично-нелінійного та конструктивно нелінійного деформування елементів при контактному, тепловому й електромагнітному навантаженняхДокумент Исследование ползучести пологих оболочек на базе уточненной теориии вариационно-структурного метода(НТУ "ХПИ", 2003) Склепус, С. Н.A creep problem for shallow shells within the framework of the refined theory is considered. The variational formulating of problem is presented. The method of solving of initially-boundary creep problem is based on joint usage of the variational-structural method and the Runge-Kutta-Merson method. The solution structures, the numerical results for creep behavior and the lifetime predictions for spherical shallow shell with different boundary conditions are presentedДокумент Увеличение срока службы режущего инструмента(НТУ "ХПИ", 2003) Гладкова, В. И.In the article the experiments results at to increasing the service period of the cut tool by drifting the plasma covers by CIB-method and influence the liquid boride method are presented. The drawn a conclusion about advisable using methods in industryДокумент Определение допустимых амплитуд вибраций для лазерной бесплатформенной инерциальной навигационной системы(НТУ "ХПИ", 2003) Погорелов, Сергей Юрьевич; Счастливец, Кирилл ЮрьевичThe tolerate vibration amplitudes which acts on laser strapdown inertial system have been investigated in the proposed paper. For created three-dimensional model have been defined the acceleration limit value and natural oscillation frequencies, on the base of what the tolerate vibration amplitudes for determined frequency range have been obtainedДокумент Нестационарное деформирование многослойных упругих тел в форме прямоугольного параллелепипеда(НТУ "ХПИ", 2003) Янютин, Е. Г.; Светличная, С. Д.; Томилка, Н. Н.The unsteady déformation of multilayered elastic solids in the shape of rectangular parallelepiped is investigated using the dynamic theory of elasticity. Motion equations and systems of primary, boundary and contact conditions are satisfied exactly owing to this methodДокумент Напряженно-деформированное состояние толстостенной цилиндрической оболочки под действием несимметричного давления(НТУ "ХПИ", 2003) Сало, В. А.The approach is suggested to definition of the stress-strained state of elastic cylinders of any thickness. The used method is based on Reissner's variational principle, R-functions theory, the common equations of the three-dimensional theory of an elasticity, I.N.Vekua's method and algorithm for two-sided estimation of exactitude of approached solutions of the mixed variational problems. Efficiency of the method is shown on exampleДокумент Дискретная модель диска с лопатками газотурбинного двигателя(НТУ "ХПИ", 2003) Григорьева, П. П.; Лымаренко, Ю. А.; Шамровский, А. Д.Blades and disks are the most loaded elements of gas-turbine engines. In view of the big complexity of a problem, research of their work demands application of the modern methods based on use of the computer. Thus discrete models, as in the best way adapted for such discrete device, as represent the computer, are very interesting. In the article the discrete model of a gas-turbine engine disk with blades is offered, allowing to take into account winding oscillations of blades together with movement of a disk. Use of symmetry of system allows to reduce a task about oscillations of system with the big number of degrees of freedom to a task with two and three degrees of freedom . All mode shapes of oscillations of the system are describedДокумент Эффективность решения краевых задач нелинейного изгиба гибких пологих оболочек методом теории R-функций(НТУ "ХПИ", 2003) Андриевская, Л. С.; Курпа, Лидия Васильевна; Морачковская, Ирина ОлеговнаThe effective method basing on theory of R-functions and variational structural method is developed for solving of non-linear boundary problems. Elastic-plastic bending of thin shallow shells is considered. The problems are reduced to finding of stationar points of suggested mixed variational functionals according to initial linearization by use of schemes of subsequent loading and Newton-Kantorovich jointly with method of varying elastic parameters. The method is used for automatic calculations in «POLE» programming system for calculations of shell structural elements. The numerical justification of the method is given. New laws of non-linear deformation of shallow shells and plates with complex shape in plane are establishedДокумент Лазерная диагностика потоков. Часть 1. Двумерные модуляторы лазерного излучения(НТУ "ХПИ", 2003) Товажнянский, Леонид Леонидович; Капинос, Василий Максимович; Никитина, Е. В.; Никитин, А. М.Plans of acoustic-optical coherent radiation modulators with fluid fissile devices and the mathematical description of bidimentional acoustic modulation processes are given. The main feature of the described modulator is to derive coherent rays individually oriented in space. Theoretical results for acoustic excitation angles from п/3 to п/2 are observationally confirmedДокумент Конечноэлементный расчет магнитных цепей активных магнитных подшипников на основе уравнений магнитостатики(НТУ "ХПИ", 2003) Смирнов, М. М.; Мартыненко, Геннадий Юрьевич; Бабенко, Игорь НиколаевичIn work the technique of account of magnetic circuits of active magnetic bearings by a method of final elements and processing of results is of fered with the purpose of definition of discrete parameters of magnetic circuit. The example of account of magnetic circuit with stator as octopole is givenДокумент Анализ чувствительности при комбинированном статико-динамическом нагружении конструкций(НТУ "ХПИ", 2003) Симсон, Эдуард Альфредович; Назаренко, Сергей Александрович; Зюзин, А. Ю.; Любецкая, В. Б.Sensitivity analysis methods of high both geometric and physical informational content are suggested for complicated FEA models, especially with design variables vector of high dimension, to minimize numbers of straight calculation procedure activation. Computational stages to obtain gradients of constructional functional are investigated. Application domain for developed mathematical apparatus is discussedДокумент Расчет скоростей скольжения гребней колес относительно рельсов(НТУ "ХПИ", 2003) Маслиев, Вячеслав ГеоргиевичIn clause the specified analytical dependences for calculation of vectors of speeds of sliding of flanges of wheels of a rolling stock on a lateral side of a rail are offered at movement on a railwayДокумент Численное исследование влияния технологических параметров изготовления на упругие свойства коротко-волокнистых композитных материалов(НТУ "ХПИ", 2003) Альтенбах, Х.; Науменко, К.; Львов, Геннадий Иванович; Пилипенко, С. Н.The paper presents a model which allows to estimate the elastic properties of thin-walled structures manufactured by means of injection molding. The starting point is the numerical prediction of the microstructure of the short fiber reinforced composite induced during the filling stage of the manufacturing process. For this purpose the commercial program Moldflow Plastic Insight® is used. The result of the filling simulation characterizing the fiber microstructure is the second rank orientation tensor. The elastic material properties after the processing are locally dependent on the orientational distribution of fibers. The constitutive model is formulated by means of the orientational averaging for the given orientation tensor. The tensor of elastic material properties is computed and translated into the format for the stress-strain analysis based on the ANSYS® finite element code. The influence of technological parameters of manufacture on microstructure and elastic properties is discussed on examples of a center-gated disk and shell of revolution