Determination of the Issue Concerning the Lift Resistance Factor of Lightweight Car

Швець, Анжела Олександрівна; Zhelieznov, К. I.; Akulov, Artem S.; Заболотный, О. М.; Chabaniuk, Ye. V.

doi:10.15802/stp2015/57098

Cited by 8 publications

(1 citation statement)

References 5 publications

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“…Quantitative evaluation of dynamic indicators can be obtained by mathematic simulation. The wagon calculation scheme should reflect the spe-cifics of the wagon interaction in the train: the possibility of manifestation of all forms of body oscillations in space, the transmission of longitudinal forces in the vertical and horizontal directions from the neighboring wagons, the record of the technical condition of individual parts of the wagon and their design features, as well as operating conditionsspeed, movement along the straight and curved tracks, loading mode, type of load, its positioning and fastening, vertical and horizontal track irregularities [5,8,13,[15][16][17][18][19][20][21][22].…”

Section: Methodsmentioning

confidence: 99%

Study of Dynamic Indicators of Flat Wagon With Load Centre Shift

Shatunov¹,

Швець²

2019

STP

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Purpose. The article deals with the determining the influence of the longitudinal and lateral shift of gravity centre of the heavy load on the flat wagons, taking into account the travel speed based on the main dynamic indicatorsthe maximum coefficients of the dynamic supplement of spring-suspended and unsprung parts, the maximum ratio of frame force to static axle load, the wheel derailment safety factor. Methodology. The study was carried out using the method of mathematical and computer simulation of the dynamic loading of flat wagons based on the model of spatial oscillations of five coupled wagons and the software complex developed in the branch research laboratory of the rolling stock dynamics and strength (BRL RSDS). Theoretical studies were carried out during the movement of the model 13-401 flat wagon on typical 18-100 bogies with speeds in the range from 50 to 90 km/h in curves with radii of 350 and 600 m, with 130 and 120 mm canting, respectively. Findings. The paper presents the analysis of theoretical studies of the rolling stock dynamics on the example of flat wagons. The calculations were carried out using an application software package. In the course of performing theoretical studies and after simulation, taking into account the processes of oscillation of the flat wagon and load in the presence of longitudinal and lateral shift of its gravity centre, the dependences of the main dynamic indicators were obtained with regard to the magnitude of the travel speed. Originality. Using the mathematical model of the five coupled wagons, the effect of shift in two directions from the central symmetry axis of the heavy load centre was studied with regard to the travel speed along the curved track of small and medium radius in order to determine the dynamic loading of the flat wagon. Practical value. As a result of the above theoretical studies, the recommendations on the maximum possible values of the centre shift of heavy loads during their transportation on flat wagons are substantiated and proposed.

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Section: Methodsmentioning

confidence: 99%

Study of Dynamic Indicators of Flat Wagon With Load Centre Shift

Shatunov¹,

Швець²

2019

STP

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Coefficient of stability against lift by longitudinal forces of freight cars in trains

Швець

Shatunov

Dovhaniuk

et al. 2020

IOP Conf. Ser.: Mater. Sci. Eng.

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The paper is devoted to a theoretical study of the car movement stability when exposed to longitudinal forces of a quasistatic nature. The authors obtained the expressions for calculating the resistance coefficient of the car lift by the longitudinal compressive force acting on the car as part of a freight train. The influence of some factor’s combination on the longitudinal forces, at which the car movement stability is still maintained, was analyzed using the analytical dependencies to assess the longitudinal loading of cars in trains. The study was carried out by analytical method for assessing the freight car stability when moving at different speeds along curved track sections. The calculations were made in a curve of small radius taking into account the inertia forces from the unbalanced acceleration. In a theoretical study, the influence of quasistatic longitudinal compressive forces depending on changes in speed and force value, as well as the influence of friction in the wheel flange and rail contact and the eccentricity of fastening the automatic coupler shank on the stability were considered. When applying the results obtained, the stability of freight rolling stock can be increased, which in turn will remove some existing restrictions on the permissible speeds and increase the technical speed of train movement. Using the described methodology for determining the lift resistance coefficient will make it possible to justify the cause of derailment, as well as to develop and put into practice technical measures to prevent the lift of carriages, thrusts and shears of the track.

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Determination the Permissible Forces in Assessing the Lift Resistant Factor of Freight Cars in Trains

Швець

Zhelieznov

Akulov

et al. 2016

STP

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Purpose. In the analytical research are considered: 1) relationships between the longitudinal force acting on the car in the train; 2) lateral and vertical forces of interaction in the contact zone «wheel – rail»; 3) dynamic indicators of cars with the magnitude of the car lift resistance factor; 4) obtaining of the dependencies between them. Methodology. The study was conducted by an analytical method assessing the sustainability of the freight car when driving at different speeds on the straight and curved track sections. Findings. In the process of studying the motion of the train, in the investigation of transport events, as well as during the training on the simulator operator, to assess the actions of the driver, the values of the longitudinal forces in the inter car connections are used. To calculate the longitudinal compressive forces, acting on the car, in which car lift resistance factor will be equal to the allowable value (critical force). To assess the impact on the value of the longitudinal force speed, coefficients of the vertical and horizontal dynamics, as well as the wind load on the side surface of the car body are the results of calculations of motion of the empty gondola car, model № 12-532 curve radius of 250 m with a rise of 150 mm and a transverse run of body of car frame relative to the track axis of the guide section 50 mm. Originality. In this study, the technique of determining the longitudinal compressive force was shown, that is somewhat different from the standard. So, as well as assessing the impact on it the speed of rolling coefficients of vertical and horizontal dynamics and wind load on the side surface of the car body. Practical value. The authors developed proposals on the enhancement of existing methods for determining the value of the longitudinal compressive forces acting on the car in which the safety value of the car lift resistance factor will be equal to the allowable value. It will evaluate the stability of each train car lift resistance factor directly during the simulation of its movement. The most effective use of this technique in the simulator designed to teach the drivers a safe way of driving trains and in the investigation of the causes of cars derailment.

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Determination of the Issue Concerning the Lift Resistance Factor of Lightweight Car

Cited by 8 publications

References 5 publications

Study of Dynamic Indicators of Flat Wagon With Load Centre Shift

Study of Dynamic Indicators of Flat Wagon With Load Centre Shift

Coefficient of stability against lift by longitudinal forces of freight cars in trains

Determination the Permissible Forces in Assessing the Lift Resistant Factor of Freight Cars in Trains

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