КОНТАКТНОЕ ПЯТНО ПРИ КОНФОРМНОМ ВЗАИМОДЕЙСТВИИ КОЛЕСАЖЕЛЕЗНОДОРОЖНОГО ПОДВИЖНОГО СОСТАВА С РЕЛЬСОМРассмотрены вопросы анализа профиля ко-леса и рельса для определения степени конформно-сти. Приведены математические выкладки, по-строены графические зависимости. Описаны усло-вия образования конформного контакта колеса с рельсом.Ключевые слова: конформное взаимодей-ствие, профиль колеса, профиль рельса, контактное пятно, степень конформности.D.Ya. Antipin, A.S. Kosmodamiansky, V.O. Korchagin CONTACT SPOT AT CONFORMAL INTERACTION OF ROLLING-STOCK WHEEL WITH RAILThe problems in the analysis of a rail contour and a rolling-stock wheel for the definition of the degree of contact conformity are considered. Computations are shown, the geometrical parameters of a contact spot are calculated, graphical dependences are created. The results obtained are juxtaposed with the existing investigations in the field of a contact interaction of a wheel with a rail.The definition of contact spot parameters under conditions of operation widens the potentialities in control systems of a locomotive clutch. A method for the conformity degree detection in a deformed contact based on the width and area definition of a contact spot of a non-elliptical shape is offered. The essential and sufficient conditions for the formation of a conformal contact of a wheel with a rail are described with the use of a mathematical device, the integral and differential methods of functions investigations are used.

Standard rated schemes for a gondola car are considered at the calculation of loading in a car dumper. There are offered refined rated schemes taking into account frozen load unloading at car turning of 90º and a buffer stop displacement of the car dumper. It is shown that the supposed rated schemes allow re-vealing the stress increase in an upper framing as compared with standard rated schemes.

There are the results of the research carried out to analyse the influence of design features of coach side diploblastic covering on its deflected mode. The research is based on the detailed construction of finite - element models.

The purpose of the work is a fatigue life assessment for bearing structures of passenger car bodies with perforated supporting elements through the methods of computer mathematical modeling. The fulfilled analysis of investigations in the field of the fatigue life assessment for welded bearing structures of car bodies has shown that its assessment should be carried out in a dynamic setting with the development of a spatial dynamic model of a car body. The fatigue life assessment in the most loaded areas of perforated supporting elements in car bodies was carried out with the use of two procedures: Serensen-Kogaev procedure and Bolotin one. There are considered ten versions of supporting element perforation in a passenger car body. The development of finite element models of car bodies with the mentioned options is carried out by the example of the body of a domestic passenger car. On the basis of the design strength computation results there are defined three most loaded areas of perforated supporting elements. The refined assessment of a dynamic stressed state of the areas under investigations is carried out through the method of an area successive accentuation. As a result of the investigation there are obtained life values of the most loaded areas for a passenger car body bearing structure for all perforation options under consideration. The results obtained confirm passenger car operation safety with the offered option of perforation and are evidence of the purposefulness in the application of the procedure offered for the fatigue life prediction of similar bearing structures.

The aim of this work consists in choosing a rational way for the definition of selfresonant frequency in car body bending vibrations of a bilevel car. A test subject is the car body of a bilevel car of the model 61-4465 manufactured by the Company «Tver Wagon Works». The vibration tests of a bilevel car were modeled. Test results were compared to the data of actual test and a computation on the recommendations of regulations. There is developed a lamellar finite-element model of a bilevel car carcass with its stiffness corresponding to a real car body. The assessment of selfresonant frequency in car body bending vibrations was carried out on basis of three variants of its model differed with the distribution of car body gross weight: uniformly throughout the whole of metalware; throughout the parts of metalware in accordance with mass position in a real car; taking into account the influence of partition rigidity in compartments and service rooms. The comparison of modeling results with the use of models described and results of actual tests shows their satisfactory correspondence that allows approaching to dynamic values of a real car body at the investigation of its loading by the methods of computer simulation.