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Документ Аналіз деформацій і напружень ретчетінгу при багатоцикловому деформуванні залізничних рейок(НТУ "ХПІ", 2006) Бреславський, Дмитро Васильович; Морачковський, Олег Костянтинович; Татарінова, Оксана АндріївнаThe paper is devoted to the method for strain-stress state determination of railroad rails considering the cyclical character of train's influence. The calculations were performed for the rail, which considers as a beam on the elastic basement, by use of the constitutive equations had been suggested by the authors. The results of stress redistribution are presentedДокумент Влияние параметров анизотропии упругой линзы на ее фокусирующие свойства(НТУ "ХПИ", 2006) Иванченко, Г. М.The cases of focusing of a plane unstationary discontinuous wave by the surfaces of a plane-convex transversally isotropic elastic lens in a transversally isotropic medium are examined. Dependence of position of focusing zones of the wave on the values of parameters of anisotropy of the lens medium is exloredДокумент Влияние присоединенных масс на динамическую устойчивость цилиндрических оболочек в сверхзвуковом потоке(НТУ "ХПИ", 2006) Курилов, Е. А.The aeroelastic stability of simply supported cylindrical shell with localized masses in supersonic flow is investigated. The Donnell-Mushtari-Vlasov nonlinear shallow-shell theory is used to describe the shell dynamics. Linear piston theory is applied to describe the fluid-structure interaction. The system is discretized by the Bubnov-Galerkin procedure. The dumping effect is analyzedДокумент Динамические характеристики систем с поворотной симметрией при нерегулярной вариации параметров(НТУ "ХПИ", 2006) Симсон, Эдуард Альфредович; Назаренко, Сергей Александрович; Белозеров, А. В.Complicated finite-element models of cyclic symmetry structure with high geometric and physical self-descriptiveness sensitivity analysis and optimization methods are given in this article. Тю methods have guiding to orientate on high dimensions of state and design variables. Computation stages of constructions gradients functional derivation are investigated. Тю developed mathematical apparatus application domains are examinedДокумент Длительная прочность диска турбины(НТУ "ХПИ", 2006) Морачковский, Олег Константинович; Соболь, Владимир НиколаевичThe problem statement and solution method of creep-damage lifetime prediction for the turbine disk are presented in the paper. The creep-damage calculation results for the disks with constant thickness and variable section are given in the various time moments. The influence analyses of the disk section form on the rupture time have been doneДокумент Експериментальне дослідження працездатності колінчастих валів та циліндро-поршневих груп дизелів авіаційної наземної техніки(НТУ "ХПІ", 2006) Приймаков, Олександр Григорович; Градиський, Юрій ОлександровичIn this article there are results long-term tests of diesel engines of the aviation ground technique. It has the purpose of determination of supply of operating properties that provide efficiency and reliability of details and assembling units within the limits of guarantee workДокумент Застосування ізотропної та анізотропної концепцій пошкоджуваності до розрахунку тривалої міцності ротору парової турбіни в умовах високотемпературної повзучості(НТУ "ХПІ", 2006) Гораш, Є. М.Within the framework of the research work two typical material models describing isotropic and anisotropic creep-damage processes in metals and alloys are applied to the simulation of the mechanical behaviour of a steam turbine rotor in its service conditions. Numerical solutions of the initial-boundary value problems have been obtained by FEM using solid axisymmetrical type finite elements. For the purpose of adequate long-term strength analysis both isotropic and anisotropic creep-damage models have been implemented in FE-code of the universal CAE ANSYS. Obtained simulation results for a steam turbine rotor show the significant sensitivity of life-time assessment to the type of material modelДокумент Исследование возможности снижения остаточных деформаций в технологической оснастке для закалки валов(НТУ "ХПИ", 2006) Мартыненко, Геннадий Юрьевич; Скрынька, Л. М.; Смирнов, М. М.; Пирогов, А. Д.In work the researches by definition of the barring opportunity of residual plastic accumulation deformations in technological equipment have been carried out which are used for shaft, rotors etc hardening. It is shown, that thermotensions are the reason of accumulation of residual deformations. The ways of the level thermotensions decreasing at the expense of application thermo-insulating materials have offeredДокумент Исследование вынужденных колебаний двух лопаток с учетом контакта в межбандажном соединении(НТУ "ХПИ", 2006) Демуз, Я. Д.; Жовдак, В. А.; Степаненко, А. С.In the given work the task about forced vibrations of blades is considered in view of contact interaction in blade-to-blade connection. The algorithm of calculation of non-linear vibrations designed in view of contact interaction.Документ Исследование динамики автомобиля методом нормальньіх форм с учетом нелинейньіх характеристик пружин подвески(НТУ "ХПИ", 2006) Михлин, Юрий Владимирович; Митрохин, С. Г.Free damped oscillations in the automobile with a nonlinear response of the suspension are considered. The 7-DOF nonlinear model is considered. As a result, nonlinear vibration modes and the corresponding skeleton curves are obtained. The transient is described in this system. The obtained results are compared with solutions of the corresponding linearized systemДокумент Исследование надежности приборного блока самолета по виброускорениям(НТУ "ХПИ", 2006) Повгородний, В. О.In this article are introduced number's index of the fail-safe including vibration accelerations, free frequences and thermal stresses. The problem is soluted by the finite element's method and method of the theory of throw outs. The results for the new device of aircraft, which introduce the pocket of plates with electronical radiotechnical elementsДокумент К активному гашению колебаний упругих систем(НТУ "ХПИ", 2006) Галас, Олег Сергеевич; Аврамов, К. В.Method of the active damping of beam oscillations is proposed in this work. Essentially nonlinear absorber with the feedback is attached to the beam. Method of the harmonic balance is used to investigate the system with the active absorber. Analysis of system stability is performed. Amplitude-frequency characteristic of the beam and absorber is buildДокумент Кинематический и динамический анализ кулачкового механизма формовочного станка(НТУ "ХПИ", 2006) Андреев, Юрий Михайлович; Дружинин, Евгений Иванович; Митин, О. В.It is resulted a technique of research of kinematics and dynamics of devices with Cam mechanisms, on the basis of use of a complex of kinematic and dynamic calculations (KIDYM), which comprises system of analytical calculationsДокумент Методика решения осесимметричных нелинейных задач для почти несжимаемых неоднородно трансверсально-изотропных гиперупругих тел вращения(НТУ "ХПИ", 2006) Кантор, Борис Яковлевич; Мисюра, Е. Ю.The numerical solution methodics of axisymmetric (with and without the torsion) physically and geometrically nonlinear problems for nearly incompressible piecewise-homogeneous nonhomogeneously transversely isotropic and isotropic hyperelastic bodies of revolution on the base of the variational principle of possible displacements in the increments which realized of the stepping algorithm of the finite element method was stated. The reliability of the results which received with the help of this methodics was confirmed by coincidence of numerical and analytic solutions of the linear (Lame) and nonlinear (A.I. Lurie) problems of deformation of the hollow cylinder and sphere loaded by the internal pressure. The proposed methodics was used for study of the stress-strain state of two types objects: the rubber-technical structures (armoured hose, different kinds of rubber support and shock-absorbers with restriction of the radial displacement of the rubber blocks) and mathematical model of the heart left ventricleДокумент Моделирование процессов накопления повреждаемости в тонких пластинах при действии ударных нагрузок(НТУ "ХПИ", 2006) Онищенко, А. В.The paper is devoted to the investigation of damage accumulation in thin plate with constant thickness, which is under impact loading. The single impact is presented in the one cycle. The linear damage summation is considered. The impact problem on the each cycle is solved by numerical-iterative method: the impact force value was found by use of finite difference scheme, the deformed plate state was determined analytically by shear Timoshenko's theory. The numerical examples are givenДокумент Моделирование термонапряженного состояния двухопорного замкового соединения лопаток паровой турбины(НТУ "ХПИ", 2006) Гармаш, Н. Г.The task of termocontact interaction for lock connection as the first stage of low pressure of the turbine K-300-240-2 is consider. Is shown, that the registration of temperature strains unessentially influencing on a level of contact pressure, strengthens non-uniformity of its distribution. That it is necessary to take into account at an estimation of functionability of constructionsДокумент Напряженное состояние цилиндров слоистой структуры с межфазными дефектами(НТУ "ХПИ", 2006) Верещака, Сергей Михайлович; Жигилий, Д. А.On the basis of the discrete-structural theory of the thin shells the variant of the settlement model of multy-layer thin-walled elements from several rigid anisotropic layers is offered. It is considered, that the voltage of cross shift and pressure on the border of contact are equal among themselves. Elastic slipping is admitted on a surface of contact of adjacent layers. The decision of the task is got in vectorially nonlinear production with account of deformations' influence of cross shift and pressure. The status of two-layer transversally isotropic cylindrical shells with interphasal defects of material's structure is investigated. The results of the theoretical researches are compared to experimental dataДокумент Неизотермическая ползучесть и повреждаемость элементов паровых турбин(НТУ "ХПИ", 2006) Гораш, Е. Н.; Лысенко, Сергей Викторович; Львов, Геннадий ИвановичThe conventional Kachanov-Rabotnov-Hayhurst type continuum damage mechanics creep model is extended to the case of variable temperature and strain hardening consideration. Both the creep and the damage rates are assumed temperature dependent. A technique for the identification of material creep constants based on the available family of experimental creep curves is presented. The resulting non-isothermal creep-damage constitutive model is incorporated into the FE-code of the universal CAE-system ABAQUS. Moreover, an example for a pressurized pipe exposed to the non-uniform heating is shown to illustrate basic features of creep-damage character in thick-walled structural componentsДокумент Некоторые подробности применения метода конечных элементов в фотоупругости(НТУ "ХПИ", 2006) Тесленко, А. А.Bases of a new modification of photoelasticity method and possibility of its model research are examined in work. Essence of a new modification consists of combination of possibilities of traditional photoelasticity method and finite-element method. Estimation of influencing of exactness of setting of the explored body on exactness in determination of tensions in the conditions of particular matter and chart of measuring is produceДокумент Нелинейные свободные колебания закрученных вращающихся стержней(НТУ "ХПИ", 2006) Аврамов, К. В.; Ширяева, Наталья Владимировна; Ищук, Ю. А.; Розова, Людмила ВикторовнаThe system of three partial differential equations describing flexural-flexural-torsional vibrations of pretwisted beam is introduced in this paper. An assumption that the center of gravity and the shear center are in different points is used here. Nonlinear modal analysis is used for discretization of this system. Free nonlinear oscillations are investigated by Shaw-Pierre method