Наведені результати теоретичних та експериментальних досліджень впливу шорсткості поверхонь на трібологічні властивості контакту «колесорейка» в криволінійних ділянках колії метрополі тену. За результатами досліджень вста новлені значення раціональної шорсткос ті контактуючих поверхонь, що послугує передумовою створення технології пре вентивного шліфування рейок для упо вільнення їх зносу при русі в криволінійних ділянках колії метрополітену Ключові слова: контактні напружен ня, модельні зразки, раціональна шор сткість, «колесорейка», колія метро політену Даны результаты теоретических и экс периментальных исследований влияния шероховатости поверхностей на три бологические свойства контакта «колесо рельс» в криволинейных участках пути метрополитена. По результатам исследо ваний установлены значения рациональной шероховатости контактирующих повер хностей, что послужит предпосылкой со здания технологии превентивного шлифо вания рельсов для замедления их износа при движении в криволинейных участках пути метрополитена Ключевые слова: контактные напря жения, модельные образцы, рациональ ная шероховатость, «колесорельс», путь метрополитена UDC 625.143 : 625.4

Abstract. In order to determine the method of contact surface treatment and to define the rational surface roughness in the wheel/rail contact for the minimal growth rate of contact fatigue defects the program of experiments in operational conditions was developed. On the basis of the results and calculations the coefficients of regression equations, which describe dependencies of the wear rate on the parameters of the contact surface treatment in real operational conditions were obtained. Besides, the diagrams of dependencies of the friction coefficient on the roughness of railhead contact surface of the high rails with and without lubrication, when laid in curves of underground systems, were built. The experiments conducted in operational conditions of Kharkiv Metro revealed the influence of roughness of the railhead side surface of the high rails in curves on the contact fatigue defect development after preventive grinding and lubrication. According to the results of the experiments it was established that the rail preventive grinding with simultaneous lubrication led to slower contact fatigue defect development in rails of underground systems. The rational roughness of the railhead side surface of the high rails in curves after preventive grinding, which led to the minimal rate of defect development, was defined.

Further development of the roadway network in Ukraine will basically take place by modernization, which, in fact, conversion of the system « Road Conditions-Traffic Flow-Environment» from one state to another. Generally, it changes not only the spatial axle position of an existing road, but also the geometric and technological parameters of the road. Modern technological design and construction processes demand higher accuracy and reliability in determining the output spatial parameters measured with survey methods and techniques. Therefore, substantiated higher accuracies and improved survey techniques are tasks of primary importance. They must be solved on the basis of determination of rational error limits in survey works and their influence on the accuracy of building, transport operational and economical parameters of the project and actual engineering structures. The objective of the study is to demonstrate possibilities and efficiency in using various models of the system of ensuring the accuracy in survey works for roadway modernization and for solving other tasks on determination of geometric element parameters of complicated sections on existing roadways.

INFLUENCE OF THE CONCENTRATION OF SMALL-WATER WATER ON THE MECHANISM OF CORROSIVE-MECHANICAL WEARING OF HYDRAULIC ENGINEERING OF VEHICLES Dr. sc. sciences S. Voronin, phd. tehn. O. Skoryk, assistant I. Safoniuk, senior lecturer of NANGU O. Rosliakov

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