Characterization of tribological behavior of high performance rail steel

The tribological characterisation of rail steels has been carried out using rolling-sliding testing device with cylindrical samples with functional geometries. The test can be considered in accordance with the similar one prescribed by the GOST normative. Two steel grade, R260 and K76 Φ have been used for the laboratory characterisation. Wear curves have been carried out and elaborated depending on the in service conditions and wear amounts of the rail. The test is suitable for the comparative wear analysis of rail steels. The experimental results were compared with the curves from scientific and technological literature and with values measured from in service rails to be validated

The interaction of the freight car and way taking into account deformation of assembled rails and sleepers

The settlement scheme is made and analytical researches of fluctuations of crew under the influence unevenness of the way in the horizontal and vertical planes taking into account impact of the railroad car on the way are executed

The experimental determination of the stress calculation and relative strains in the span elements of railway bridges under the influence of the rolling equipment

Some results of measurements of bending deformation concrete span bridge are given. It is shown that for a more detailed estimation of the dynamic answer of the structure and the establishment of the correspondence between the analytical model and behavior of structure, it is necessary to carry out periodic monitoring of tense-strained state of the structure under operating load

Seismic resistance of horizontal underground openings in anisotropic rocks

Fine-layered mountain mass with plane-parallel inclined layers is presented by anisotropic (transtropic) body with inclined plane of isotropy. A long horizontal cavity of arbitrary orientation and section shape is that medium; it is strengthened by an elastic anisotropic finishing. The interaction between the finishing and viscos-elastic rock medium is studied. The seismic-stress state of the “inishing-rock” system under aggregate action of long tension-compression and shear waves in conditions of generalized plane strains is investigated by using the quasistatic approach and complex potentials method. The procedure of research of seismic oscillations of a complex structure rock with multipurpose underground cavity using finite elements method and strong earthquake oscillograms is presented here

Modeling of dynamic characteristics of freight car withoptimized parameters of wedge-type shock absorber

Shock absorbers are intended for developing forces providing the elimination or reduction of the amplitude of cars or their parts fluctuations. On the CIS railroads, the wedge-type shock absorber became the most wide-spread in trucks of freight cars. In friction shock absorbers, the friction force arises in vertical and horizontal movements of the absorber wedges rubbing on friction plates fixed on the columns of the truck sidewalls. In the article, the modeling of dynamic characteristics of a freight car with the optimized parameters of the wedge-type shock absorber is performed. The modeling is performed by means of the software complex for studying the problems of dynamics of rail vehicles: “The universal mechanism”. A dynamic and block diagram of the dynamic model of the car platform, as well as of the mathematical model for studying the friction force and interaction of contact power elements, accounting the creep forces in contact by means of the FASTSIM algorithm based on the Kalker linear theory, is developed. The obtained results of modeling of an eight-wheel freight car with modernized frictional wedges show that in the truck modernization it is expedient to provide additional devices, for example a frictional shock absorber in the central step of suspension. The results of the carried out study prove the expediency of using for the upgraded truck of 18-100 model the design of M1816.06.000 SB, M1819.00.000 SB wedges, at this it is recommended to accept rigidity of elastic elements of these wedges equal to 1.1 kN/mm that is a compromise solution for the safe car movement in the empty and loaded modes

The influence of operational factors on the contact-fatigue effect of couple of wheel-rail friction in curves of small radius

Lubrication on sharp curves has been commonly adopted as a method of reducing friction between the wheel flange and rail gauge face to minimize wear and energy consumption. Additionally, lubrication between the running surface of the low-rail and the wheel tread has recently been recognized as a significant factor in reducing the likelihood of low-rail corrugation, squealing noise and rail gauge face wear. This paper describes a friction-moderating system (FRIMOS) for the interface between the top of the low-rail and the wheel tread, consisting of a solid lubricant known as a friction moderator and a jetting device installed on the vehicle to apply the moderator to the wheel/rail interface

The researching of the dynamic properties of long-wheelbase platforms for the transportation of large-capacity containers

The modern market of transport services requires the saturation of the car fleet, a specialized type of construction designed to carry a special kind of cargo, for example, heavy cargo containers, various automotive equipment, etc. It is necessary to increase the speed of movement and safety of the goods carried. A review of the work related to the improvement of the running parts of freight cars showed that over the past 50 years a large number of different types of freight wagon carriages have been developed. At the same time, the main attention was paid to the improvement of individual elements during the creation of bogies, and the problem of the wear of the part of the trolleys was solved while preserving the unchanged ideologues lay in the CRI-Х3 trolley. However, the question of the choice of constructive schemes and rational parameters of the spring suspension of bogies is not completely resolved

Modeling of dynamic characteristics of freight car withoptimized parameters of wedge-type shock absorber

Shock absorbers are intended for developing forces providing the elimination or reduction of the amplitude of cars or their parts fluctuations. On the CIS railroads, the wedge-type shock absorber became the most wide-spread in trucks of freight cars. In friction shock absorbers, the friction force arises in vertical and horizontal movements of the absorber wedges rubbing on friction plates fixed on the columns of the truck sidewalls. In the article, the modeling of dynamic characteristics of a freight car with the optimized parameters of the wedge-type shock absorber is performed. The modeling is performed by means of the software complex for studying the problems of dynamics of rail vehicles: “The universal mechanism”. A dynamic and block diagram of the dynamic model of the car platform, as well as of the mathematical model for studying the friction force and interaction of contact power elements, accounting the creep forces in contact by means of the FASTSIM algorithm based on the Kalker linear theory, is developed. The obtained results of modeling of an eight-wheel freight car with modernized frictional wedges show that in the truck modernization it is expedient to provide additional devices, for example a frictional shock absorber in the central step of suspension. The results of the carried out study prove the expediency of using for the upgraded truck of 18-100 model the design of M1816.06.000 SB, M1819.00.000 SB wedges, at this it is recommended to accept rigidity of elastic elements of these wedges equal to 1.1 kN/mm that is a compromise solution for the safe car movement in the empty and loaded modes

Simulation technique of constant contact side bearings of freight car bogies

Actually, the side bearings of constant contact cabs are installed on freight cars of new design railroad gage of 1520 mm. Parameters of side bearing elastic elements have significant effect on dynamic behavior of the car and traffic safety. The article is devoted to comparison of side bearing of standard (rigid, shim) design body and bearings of constant contact by means of computer modeling