A.S. Gaponenko, M.V. Bushuev Approaches in the Planning of Planned-Preventive Setup and Evaluation of Rail Way State [more] [back]
Purpose: The research of the matters of planning of planned-preventive setup of a rail way and the analysis of rail track geometry condition before and after the pursing of the setup basing on data of track measuring car passage have shown that existing criteria of the assignment of track planned-preventive setup do not consider exploitation conditions and their reconsideration is demanded. Methods: Statistical methods were used in research pursuing on the matters of planning and evaluation of railway track condition after work fulfillment on planned-preventive setup. Data sampling and analysis of statistical observations have allowed to distinguish applied approaches in the planning of track planned-preventive setup for various exploitation conditions. Grouped in dynamics rows furbished kilometers were evaluated according to the indicators: second degree retreat presence, rail track geometry state estimation before and after repairs and by the end of repairs year. Results: The discrepancies with established criteria were identified at planning on including of kilometers into address plan of track planed-preventive setup, the data on work accomplishment quality and rail way state changes during the first year after repairs were obtained. Practical importance: Research results confirm the necessity to reconsider the criteria for track planed-preventive setup assignment with the distinguishing there separately the main and additional criteria in dependence of exploitation conditions. It’s necessary to pursue railway track inspection in accordance with normative document requirements of federal level and JSC RZD. Keywords: track repairs, work planning on a way, inter-repairs scheme, work inspection after track repairs, assignment criteria, planned-preventive setup, evaluation by points, track condition evaluation
D.D. ugli Karimov Numerical Simulation of Aerodynamic Processes of Air Mass Movement in Underground Tunnels Taking into Account Piston Impact of Rolling Stock [more] [back]
Purpose: To consider the issue on verification of numerical model of air exchange during the movement of a train in a subway tunnel, taking into account the process of interaction of regular ventilation with the piston effect of the displaced air by the body of the moving train. Methods: Data scanning and processing. The equipment used was a pressure cylindrical Pitot tube PFM 2 for measuring differential pressure and air flow velocity, volumetric flow and temperature. Results: The dynamic structure of disturbed fluid media at the time of rolling stock arrival and departure has been established. Practical importance: Factors of design solutions of tunnel portal part affecting the process of air exchange at the combined work of ventilation and piston effect of moving trains have been determined. Keywords: piston effect, Pitot cylindrical pressure tube PFM, SCB cabinets, CFD modeling, pressure field, anemometer, air temperature
K.E. Kovalev, A.V. Novichikhin Efficiency Rise in Functioning of Low-Intensity Lines: Problem Statement and Mathematical Models [more] [back]
Purpose: The article proposes a solution of the problem of functioning of low-intensity lines. The provisions of the strategies for the development of railway transport for various planning horizons are considered in the context of improving the efficiency of the operation of low-intensity lines. The mechanism of assessment on the set of indicators and stages of life cycle of the lines has been defined. The scenarios of sustainable development of low-intensity lines depending on life cycle phase are formed. The mechanism for the evaluation and current stimulation of low-intensity lines has been developed to maintain optimal values of key parameters. The features of the functioning of low-intensity lines on Russian railways are determined in terms of high social significance for population and strategic importance for the country and the correlation of the size of traffic in the regions with the country economic development. Mathematical formulation of the problem of effective functioning of low-intensity lines based on its decomposition is proposed to determine the stages of the life cycle. The model of managing the interaction of intense and low-intensity lines has been improved by means of fuzzy cognitive modeling methods. An enlarged fuzzy cognitive map for the control of intense and low-intensity lines is presented. Control concepts that have a significant impact on the control object are defined. Methods: Methods of analysis and synthesis, system theory, mathematical modeling are applied. Results: A solution for the problem of increasing the efficiency of the operation of low-intensity lines in modern conditions from the standpoint of loosely-structured systems is proposed. Practical significance: Mathematical formulation of the problem of low-intensity line functioning is presented which is solved by determining the stages of the life cycle and the model for managing the interaction between intense and low-intensity lines based on fuzzy cognitive modeling for practical application to existing low-intensity lines. Keywords: railway transport, managing approach, low-intensity lines, transportation process management, transportation management, fuzzy cognitive maps