Щоб переглянути інші типи публікацій з цієї теми, перейдіть за посиланням: Railway traffic modeling.
Статті в журналах з теми "Railway traffic modeling"
Оформте джерело за APA, MLA, Chicago, Harvard та іншими стилями
Ознайомтеся з топ-50 статей у журналах для дослідження на тему "Railway traffic modeling".
Біля кожної праці в переліку літератури доступна кнопка «Додати до бібліографії». Скористайтеся нею – і ми автоматично оформимо бібліографічне посилання на обрану працю в потрібному вам стилі цитування: APA, MLA, «Гарвард», «Чикаго», «Ванкувер» тощо.
Також ви можете завантажити повний текст наукової публікації у форматі «.pdf» та прочитати онлайн анотацію до роботи, якщо відповідні параметри наявні в метаданих.
Переглядайте статті в журналах для різних дисциплін та оформлюйте правильно вашу бібліографію.
1
Lanis, Aleksey. "Results of modeling the behavior of the subgrade with pressure injection of solidifying solutions." MATEC Web of Conferences 239 (2018): 05006. http://dx.doi.org/10.1051/matecconf/201823905006.
Повний текст джерелаАнотація:
Further development of railway transport is possible through increasing the traffic intensity by increasing the weight and number of trains and their speed. The growth of defects and deformations of the subgrade is inevitable, and the issues related to the reinforcement of soils of the subgrade are relevant. Measures that result in reliable operation of railway infrastructure facilities can be implemented during major repairs or new construction, which requires traffic restriction and leads to additional economic costs. Thus, one of the priority issues is the development and implementation of ways to reinforce the subgrade of railways without traffic restriction. Such methods can include pressure injection, as well as various modifications of this method based on combining known methods of reinforcement and injection.
2
NING, BIN, KE-PING LI, and ZI-YOU GAO. "MODELING FIXED-BLOCK RAILWAY SIGNALING SYSTEM USING CELLULAR AUTOMATA MODEL." International Journal of Modern Physics C 16, no. 11 (November 2005): 1793–801. http://dx.doi.org/10.1142/s0129183105008308.
Повний текст джерелаАнотація:
In this paper, we propose a new cellular automata model to simulate the railway traffic. The proposed model is based on deterministic NaSch traffic model. The signaling system adopted in this work is the three-aspect fixed-block signaling system. In order to obtain insight into the characteristic behavior of the railway signaling system, we analyze the space-time diagram of traffic flow and the trajectory of train movement etc. The simulation results demonstrate that the proposed CA model can be successfully used for the simulations of railway signaling system. Some complex phenomena observed in railway system can be reproduced.
3
Kornaszewski, Mieczysław. "Modelling of exploitation process of the railway traffic control device." WUT Journal of Transportation Engineering 124 (March 1, 2019): 53–63. http://dx.doi.org/10.5604/01.3001.0013.6634.
Повний текст джерелаАнотація:
The basic purpose of railway traffic control devices is to ensure a high level of safety of moving trains on the railway network. The railway traffic control devices often work in difficult environmental conditions and are exposed to external interference. These circumstances require continuous analysis of the state of the railway traffic control system. With time, the system's technical condition deteriorates. When its technical condition is not satisfactory it is necessary to operate it and renew its state of use. The rational implementation of exploitation tasks of the railway traffic control system allows the introduction of mathematical modeling methods into exploitation tests. Using the mathematical model of the exploitation process of the railway traffic control system, it is possible to forecast e.g. reliability indicators of its individual objects. Knowledge of exploitation parameters should be used in making decisions in the process of managing the exploitation of the railway traffic control devices.
4
LI, KE-PING, ZI-YOU GAO, and BIN NING. "MODELING THE RAILWAY TRAFFIC USING CELLULAR AUTOMATA MODEL." International Journal of Modern Physics C 16, no. 06 (June 2005): 921–32. http://dx.doi.org/10.1142/s0129183105007613.
Повний текст джерелаАнотація:
The NaSch model is a probabilistic cellular automaton (CA) model for the description of single-lane highway traffic. Based on this model, we propose a new cellular automata model for the railway traffic. The signaling system adopted in this work is the moving block signaling system. In our model, the distance between the following train and its leading train takes into account the velocity of the leading train. The simulation results demonstrate that our model is suitable for simulating the railway traffic. Compared our scheme to the traditional moving-space-block scheme, it is obvious that using our scheme, not only the line capacity can be increased, but also the traffic flow states are safer.
5
Timukhina, Yelena, Petr Kozlov, Vitaly Kolokolnikov, and Nikolay Tushin. "Modeling of large railway polygons." MATEC Web of Conferences 216 (2018): 02025. http://dx.doi.org/10.1051/matecconf/201821602025.
Повний текст джерелаАнотація:
When large junctions of railway polygons are studied, detailed modeling is subject to some limitations. Therefore, it is necessary to develop appropriate tools. This paper presents an aggregate (macromodeling) technique for necks and yards of railway stations. Results of calculations based on aggregate models are highly consistent with results of detailed modeling, which confirms the applicability of this modeling method to railway polygons. The proposed principles were implemented on the basis of the IMETRA simulation system. The resulting polygon model makes it possible to determine the total throughput of a polygon and to identify bottlenecks that slow down car traffic.
6
Kupitman, Julia O. "MODELLING COMMUTER TRAINS USING CORRESPONDENCE MATRIX." Vestnik of Astrakhan State Technical University. Series: Management, computer science and informatics 2021, no. 2 (April 30, 2021): 29–38. http://dx.doi.org/10.24143/2072-9502-2021-2-29-38.
Повний текст джерелаАнотація:
The article considers the problem of planning transport solutions for development and improvement of railway transport in the suburban direction because of impossibility to separate and to describe the flows of requests, as well as to determine the system states. It has been stated that under such conditions the approach using correspondence matrices in modeling looks promising. The applicability of the methods to passenger transportation by railway is being considered. The method of calculating service time of passenger traffic by electric train is described in the case of calculating the service time between the railway stations Irkutsk-Passenger-Shelekhov. Train downtime at each station depends on the number of people waiting, and travel time between stations is stated as constant. There is given a description of a software product, whose algorithm includes this method. With further development of the software and its introduction into internal automated system of Russian Railways it will be possible to calculate the workload of each railway line, to track passenger traffic and to plan an electric train with a suitable number of cars. This will help to increase the efficiency of commuter trains.
7
Lindenmaier, László, István Ferenc Lövétei, Gábor Lukács, and Szilárd Aradi. "Infrastructure Modeling and Optimization to Solve Real-time Railway Traffic Management Problems." Periodica Polytechnica Transportation Engineering 49, no. 3 (September 1, 2021): 270–82. http://dx.doi.org/10.3311/pptr.18582.
Повний текст джерелаАнотація:
Rail transportation helps to reach the global climate targets because it is characterized by low emission. The passenger and freight volumes on the railway increase yearly in line with EU targets. However, delays of passenger and freight trains decrease the punctuality and the reliability of the railway sector and the development of the infrastructure is not enough to increase the average speed of trains. Delays mean cost to the passengers, railway operators, infrastructure managers, and all railway undertakers. Therefore, the reason for the most significant optimization target is to minimize delays. In this paper, a possible solution has been described to solve the real-time railway traffic management problems by applying a mixed-integer linear programming approach. For validation of the research result, one simplified case study has been presented. Based on the result, the presented solution can provide effective support to dispatchers in solving real-time traffic management problems.
8
Kotenko, Alexey, Iosyph Kokuryn, Vladimir Belozerov, and Vyacheslav Tymchenko. "Evaluation method of reconstructed railway line train-handling capacity based on simulation modeling." Proceedings of Petersburg Transport University, no. 2 (June 20, 2017): 372–80. http://dx.doi.org/10.20295/1815-588x-2017-2-372-380.
Повний текст джерелаАнотація:
Objective: To improve prediction estimate of traffic volume development on reconstructed railway lines. Methods: The study is dedicated to the development of simulation modeling method, statistical data processing method, as well as probability theory and method for determination of capital investments’ economic efficiency were also applied in the research. Results: A simulation modeling method of train-handling capacity estimation on a reconstructed railway line, including the validation of a reconstructed railway line modeling limits, the assessment of track possession approval, account of freight traffic characteristics and matching probability calculation of a modeled and required train-handling capacity of a railway line. A simulation modeling method of train handling on a reconstructed railway line was developed, including the procedure of assessment of train delays at stations and track possession approval, as well as checking procedure of track possession approval for the given number of freight trains. It was shown that, on the basis of simulation modeling of train handling on a reconstructed railway line data processing with track possession approval, different “categories” of freight trains handling and the duration of tracks’ occupation, matching probability of a modeled and required train handling capacity of a railway line may be assessed. Practical importance: The suggestions stated in the study will allow design engineers of organizations to assess the delay level at the stations from track possession approval when handling freight trains of different lengths and bulk, in the process of calculation of train handling capacity of railway lines.
9
FLAMMINI, FRANCESCO, STEFANO MARRONE, MAURO IACONO, NICOLA MAZZOCCA, and VALERIA VITTORINI. "A MULTIFORMALISM MODULAR APPROACH TO ERTMS/ETCS FAILURE MODELING." International Journal of Reliability, Quality and Safety Engineering 21, no. 01 (February 2014): 1450001. http://dx.doi.org/10.1142/s0218539314500016.
Повний текст джерелаАнотація:
European Railway Traffic Management System/European Train Control System (ERTMS/ETCS) is a recent standard aimed at improving performance, safety and inter-operability of modern railways. In order to be compliant to ERTMS/ETCS, a railway signalling system must meet strict nonfunctional requirements on system level failure modes. In this paper, a multiformalism model is employed to perform an availability analysis of an ERTMS/ETCS reference architecture at early phases of its development cycle. At this aim, a bottom-up analysis is performed from subsystem failure models (expressed by means of Generalized Stochastic Petri Nets, Fault Trees and Repairable Fault Trees) up to the overall system model. The modular approach, here used, allows to evaluate the influence of basic design parameters on the probability of system-level failure modes and demonstrates that system availability is within the bound required by the ERTMS/ETCS specification. The results show that the multiformalism modeling approach helps to cope with complexity, eases the verification of availability requirements and can be successfully applied to the analysis of complex critical systems.
10
Basalaeva, Anna, Vladimir Medvedev, and Pavel Strykov. "Integrated safety system for workers and traffic in railway transport." MATEC Web of Conferences 239 (2018): 02007. http://dx.doi.org/10.1051/matecconf/201823902007.
Повний текст джерелаАнотація:
The safety and stability of the transportation process in railway transport is provided by a set of various measures. However, violations, incidents and accidents continue to occur, causing significant damage to workers, infrastructure, natural environment, and population. The relevance of the study is determined by the need of finding ways to prevent this damage and reduce the socio-economic and environmental costs. The purpose of the study is the development of an integrated safety system for traffic and workers in railway transport. A set of theoretical and experimental research methods has been applied: physical, simulation and computer modeling; statistics, theory of probability and others. The main result of the development is a complex system of interrelated units: “Sphere of activity”; “Qualification of personnel”; “The required level of work”; “Rating of danger”; “Optimization and technical and economic assessment of company costs”. Requirements for an information management system were developed for the holding company “Russian Railways”. This system allows personal accounting of the qualifications of employees (over 900 thousand) in the main areas of activity: ensuring traffic safety; occupational safety and health; transport, industrial, fire and electrical safety; protection in emergency situations. The project of the normative and technical document regulating the corresponding changes is substantiated. On the basis of theoretically processed experimental material, the expected development efficiency was established: 8-10%.
11
Parakhnenko, I. L. "Assessment of the influence of train weight and driving mode on the interaction forces in the «wheel-rail» contact zone." Herald of the Ural State University of Railway Transport, no. 1 (2022): 65–71. http://dx.doi.org/10.20291/2079-0392-2022-1-65-71.
Повний текст джерелаАнотація:
The article presents a study to assess the impact of the introduction of heavy-weight traffic on the main forces of interaction arising in the «wheel-rail» contact zone while a freight train is in motion along curved sections of the railway track. Mixed traffic is used on domestic railways, but there are no dedicated specialized lines for the operation of high-speed passenger and freight traffic with increased axle load. In this case, the possibility of the track infrastructure becomes decisive. Improving the operational efficiency, first of all, of track facilities, is impossible without scientifically based methods. The qualitative operation of a track depends on the forces arising from the interaction of the wheel-rail pair. This paper presents a study of the force interaction of the contact zone with an increase in the axle load on one of the sections of the Sverdlovsk railway. Horizontal transverse lateral and longitudinal forces are considered by means of simulation modeling. Since the introduction of heavy-weight traffic is caused by the change in the traction characteristics of a train, the article presents the results of work on the study of influence of the train driving mode on the forces under consideration.
12
Dolia, О., and К. Dolia. "SIMULATION MODELING OF PARAMETERS OF FUNCTIONING OF RAILWAY PROJECTS." Municipal economy of cities 1, no. 154 (April 3, 2020): 133–37. http://dx.doi.org/10.33042/2522-1809-2020-1-154-133-137.
Повний текст джерелаАнотація:
The speed of communication on any route, directly and indirectly through the function of redistribution of traffic volumes, causes an increase in the number of movements, traffic volumes, transport work, in the network of the appropriate type, at the same time the values of the medium system coefficient of passenger capacity use and the number of vehicles may vary both in the direction of the increase and vice versa. The results of the calculations of the basic parameters of the functioning of intercity passenger route systems for various values of the speed of communication on intercity railway routes established the appropriate mathematical model for determining the parameters of this passenger communication. The conducted analysis of simulation methods has determined the possibility of using for the determination of quantitative parameters for changing the basic indicators of the operation of the system of intercity passenger route methods of mathematical and computer simulation. The results of the work determined the basic indicators of the functioning of the system of intercity passenger route transportation. These indicators include: the number of movements in the network; volume of transportation; transfer ratio; transport work; average distance of the route; average distance of the network ride; medium coefficient of passenger capacity use; required number of buses / cars. According to the analysis of the methods and models of calculations of the basic indicators of the functioning of the system of intercity passenger traffic, it was assumed that the change in the quantitative characteristics of the parameters entering into the system or the quantitative characteristics of its elements may lead to a change in the quantitative indicators of the functioning of the system itself or its individual elements. Keywords: transport system, intercity passenger transport route, basic parameters of transportation, efficien-cy, model.
13
Enokela, JA, and KL Oladejo. "AN AUTOMATED RAILWAY STATION TRAFFIC CONTROL SYSTEM." Nigerian Journal of Technology 36, no. 1 (December 29, 2016): 138–47. http://dx.doi.org/10.4314/njt.v36i1.18.
Повний текст джерелаАнотація:
Majority of accidents experienced with railway transportation involve collision with automobiles or other vehicles and collision with other trains. These collisions can be averted by putting safety measures in place. Part of the measures can be achieved by using computerized railway station traffic control systems that use microcontrollers and electromechanical devices to shift traffic from one rail lane to another and also to operate the level crossing gate. The two major stages of the system being described here are thus the track switching stage and the level crossing gate stage. The system makes use of microcontrollers for decision making. The microcontrollers are programmed to detect signals from sensors and to output the processed signals to control electromagnetic devices through motor drivers. The codes for the microcontrollers were written in PIC Basic programming language and were debugged and compiled using Micro Code Studio Integrated Development Environment. The resultant Hex files were programmed into the memory of the microcontrollers with the aid of a universal programmer. Software simulation was carried out using the Proteus virtual system modeling software. A scaled down prototype of the system was built and tested. The prototype was able to execute all the decisions required to control the given railway station. A practical real life system would require the scaling up of the power required to drive the various motors; the logic of the system would however remain unchanged. The inclusion of the automated traffic control lighting system at the level crossing gate in the system eliminates the fatigue and tedium associated with a manually controlled traffic system. The computerized railway station traffic control system which helps in track switching and level crossing gate traffic control is capable of improving reliability, speed, operational safety and efficiency of the railway transportation system.
14
Kuswati, Atik S., Siti Maimunah, and Herawati Herawati. "Peran Infrastruktur Kereta Api Terhadap Perekonomian Daerah." Warta Penelitian Perhubungan 23, no. 2 (May 15, 2019): 172. http://dx.doi.org/10.25104/warlit.v23i2.1060.
Повний текст джерелаАнотація:
Transportation infrastructure has a significant role towards economic development. Railway infrastructure is expected to give a high contribution in regional development. The study was conducted to understand the role of the railway infrastructure in supporting the regional economy by using Gross Regional Domestic Product (GRDP) as a measurement. By using a dynamic spatial econometric models, it is expected to know how big influence the railway infrastructure on GDP and its effect may differ in national and regional levels. The result of model analysis showed that the addition amount of traffic or route service would raise GDP growth by 0.069%, whereas with the addition of traffic or route service frequency will increase GDP grmuth by 0.005%. Modeling results that positively affect GDP grmuth is the amount of traffic or traffic routes and frequency of services or service routes. Both these variables describe the traffic capacity that has a strong correlation with the availability of rail infrastructure. Through the simulation increases the number of paths, then if the total amount of the current trajectory is increased 1.1 times, it can affect GDP growth up to 0.076% while the frequency of traffic can contribute to GDP growth up to 0.005% and the frequency of cross-influence may continue to increase if the number cross frequency was increased.Keywords: railway infrastructure, regional economy
15
Diviš, Roman, and Antonín Kavička. "Reflective Nested Simulations Supporting Optimizations within Sequential Railway Traffic Simulators." ACM Transactions on Modeling and Computer Simulation 32, no. 1 (January 31, 2022): 1–34. http://dx.doi.org/10.1145/3467965.
Повний текст джерелаАнотація:
This article describes and discusses railway-traffic simulators that use reflective nested simulations. Such simulations support optimizations (decision-making) with a focus on the selection of the most suitable solution where selected types of traffic problems are present. This approach allows suspension of the ongoing main simulation at a given moment and, by using supportive nested simulations (working with an appropriate lookahead), assessment of the different acceptable solution variants for the problem encountered—that is, a what-if analysis is carried out. The variant that provides the best predicted operational results (based on a specific criterion) is then selected for continuing the suspended main simulation. The proposed procedures are associated, in particular, with the use of sequential simulators specifically developed for railway traffic simulations. Special attention is paid to parallel computations of replications both of the main simulation and of supportive nested simulations. The concept proposed, applicable to railway traffic modelling, has the following advantages. First, the solution variants for the existing traffic situation are analyzed with respect to the feasibility of direct monitoring and evaluation of the natural traffic indicators or the appropriate (multi-criterial) function. The indicator values compare the results obtained from the variants being tested. Second, the supporting nested simulations, which potentially use additional hierarchic nesting, can also include future occurrences of random effects (such as train delay), thereby enabling us to realistically assess future traffic in stochastic conditions. The guidelines presented (for exploiting nested simulations within application projects with time constraints) are illustrated on a simulation case study focusing on traffic assessment related to the track infrastructure of a passenger railway station. Nested simulations support decisions linked with dynamic assignments of platform tracks to delayed trains. The use of reflective nested simulations is appropriate particularly in situations in which a reasonable number of admissible variants are to be analyzed within decision-making problem solution. This method is applicable especially to the support of medium-term (tactical) and long-term (strategic) planning. Because of rather high computational and time demands, nested simulations are not recommended for solving short-term (operative) planning/control problems.
16
Wang, Min, and Liang Jie Xu. "Study on Traffic Congestion State Modeling of Urban Road." Advanced Materials Research 143-144 (October 2010): 419–23. http://dx.doi.org/10.4028/www.scientific.net/amr.143-144.419.
Повний текст джерелаАнотація:
In this paper, from the medi-scope point of view, the intersection parameter is classified as the section parameter, and then the new intersection traffic state coefficient is defined. Based on the reachable matrix, a new method-hierarchical intersection analysis is used to divide the intersections into different crowded levels. Next, crossroad accessibility matrix is developed to distinguish the section connectivity and get the state results of the whole network. Last, we use this method to identify congestion state of the traffic on the road around Wuchang railway station, and the outcome shows the simulation result and the practical state are consistent.
17
KUZNETSOV, A. V., A. A. AVRAMENKO, and D. G. BLINOV. "MODELING TRAFFIC JAMS IN SLOW AXONAL TRANSPORT." Journal of Mechanics in Medicine and Biology 10, no. 03 (September 2010): 445–65. http://dx.doi.org/10.1142/s0219519410003502.
Повний текст джерелаАнотація:
The purpose of this paper is to develop a model capable of simulating traffic jams in slow axonal transport. Slowing of slow axonal transport is an early sign of some neurodegenerative diseases. Axonal swellings observed near the end stage of such diseases may be an indication of traffic jams developing in axons that cause the slowing down of slow axonal transport. Traffic jams may result from misregulation of microtubule-associated proteins caused by an imbalance in intracellular signaling or by mutations of these proteins. This misregulation leads to a decay of microtubule tracks in axons, effectively reducing the number of "railway tracks" available for molecular-motor-assisted transport of intracellular organelles. In this paper, the decay of microtubule tracks is modeled by a reduction of the number density of microtubules in the central part of the axon. Simulation results indicate that the model predicts the build-up of the bell-shaped concentration wave, as the wave approaches the bottleneck (blockage) region. This increase in concentration will likely plug the bottleneck region resulting in a traffic jam that would hinder the slow axonal transport.
18
Zafar, M. I., S. Bharadwaj, R. Dubey, and S. Biswas. "DIFFERENT SCALES OF URBAN TRAFFIC NOISE PREDICTION." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLIII-B2-2020 (August 14, 2020): 1181–88. http://dx.doi.org/10.5194/isprs-archives-xliii-b2-2020-1181-2020.
Повний текст джерелаАнотація:
Abstract. Noise pollution is an important problem. Places around the road or railway corridor can get serious noise hazards in the outdoor environment. The problem of noise is dynamic and varies from one location to another. It becomes more challenging due to the varying nature of noise sources (e.g., bus, truck, tempo, etc.) that differ in frequency spectra of audible noises. It is required to characterize the noise environment for an area, which requires noise measurement and use it for noise prediction. An attempt has been made to predict the noise levels in the form of noise maps. Noise prediction requires information on terrain data, noise data (of sources) and a model to predict noise levels around the noise sources. With the variation in terrain data, noise data, and use of prediction model the performance of prediction can vary. Thus, the study is conducted at three different locations i.e., (i) Ratapur Road crossing, Rae Bareli (ii) Bahadurpur Road crossing, at Jais, and (iii) RGIPT Academic Block close to the railway track. The three studies indicated how the performance of prediction can vary with changes in the quality of terrain data, noise sampling, and schemes of noise modeling. Generally, with a better quality of terrain data (comprehensive and precise), better prediction can be possible. Similarly, more focused and event-specific noise recording, modeling can provide more detailed time-specific noise mapping, which is not possible otherwise with customary average noise recording technique. However, detailed and comprehensive modeling warrants complex and bigger data handling.
19
Martynenko, Alexander Valerievich, and Kirill Konstantinovich Vakolyuk. "Forecasting of passenger traffic in commuter rail operation on the basis of social and economic indicators and structure of land use (on example of Chelyabinsk region)." Transport of the Urals, no. 4 (2021): 58–65. http://dx.doi.org/10.20291/1815-9400-2021-4-58-65.
Повний текст джерелаАнотація:
In many issues connected with organization and planning of passenger transportation in commuter rail operation an important role has forecasting of passenger traffic based on accessible information about its origin and absorption near railway stations. In order to get such a forecast researchers mostly use models of direct demand that represent regression dependencies between passenger traffic and ride cost, its duration and also social and economic characteristics of settlements (population, average income, unemployment rate and etc.) served by railway stations. The paper suggests an approach to modeling of direct demand that is based on methods of machine learning and that uses not only social and economic characteristics as explaining variables but also geodata about structure of land use near railway stations. The approach considered is realized for the commuter rail operation in Chelyabinsk region.
20
Mhalla, Anis, and Mohanned Gaied. "Modeling and Robustness Study of Railway Transport Networks Using P-Timed Petri Nets." Journal of Engineering 2018 (November 29, 2018): 1–12. http://dx.doi.org/10.1155/2018/2083576.
Повний текст джерелаАнотація:
The importance of public transport systems continues to grow. These systems must respond to an increasing demand for population mobility and traffic disturbances. Rail transport networks can be considered as Discrete Event Systems (DES) with time constraints. The time factor is a critical parameter, since it includes dates to be respected in order to avoid overlaps, delays, and collisions between trains. P-time Petri Nets have been recognized as powerful modeling and analysis tools for railway transport systems. Temporal disturbances in these systems include railway infrastructure, traffic management, and disturbances (weather, obstacles on the tracks, malice, social movement, etc.). The developments presented in this paper are devoted to the modeling and the study of the robustness of the railway transport systems in order to evaluate the stability and the efficiency of these networks. In this study two robust control strategies towards time disturbances are presented. The first one consists of compensating the disturbance as soon as it is observed in order to avoid constraints violation. The second one allows generating, by the control, a temporal lag identical to the disturbance in order to avoid the death of marks on the levels of synchronization transitions of the P-time Petri net model.
21
Lavoué, François, Olivier Coutant, Pierre Boué, Laura Pinzon-Rincon, Florent Brenguier, Romain Brossier, Philippe Dales, Meysam Rezaeifar, and Christopher J. Bean. "Understanding Seismic Waves Generated by Train Traffic via Modeling: Implications for Seismic Imaging and Monitoring." Seismological Research Letters 92, no. 1 (October 21, 2020): 287–300. http://dx.doi.org/10.1785/0220200133.
Повний текст джерелаАнотація:
Abstract Trains are now recognized as powerful sources for seismic interferometry based on noise correlation, but the optimal use of these signals still requires a better understanding of their source mechanisms. Here, we present a simple approach for modeling train-generated signals inspired by early work in the engineering community, assuming that seismic waves are emitted by sleepers regularly spaced along the railway and excited by passing train wheels. Our modeling reproduces well seismological observations of tremor-like emergent signals and of their harmonic spectra. We illustrate how these spectra are modulated by wheel spacing, and how their high-frequency content is controlled by the distribution of axle loads over the rail, which mainly depends on ground stiffness beneath the railway. This is summarized as a simple rule of thumb that predicts the frequency bands in which most of train-radiated energy is expected, as a function of train speed and of axle distance within bogies. Furthermore, we identify two end-member mechanisms—single stationary source versus single moving load—that explain two types of documented observations, characterized by different spectral signatures related to train speed and either wagon length or sleeper spacing. In view of using train-generated signals for seismic applications, an important conclusion is that the frequency content of the signals is dominated by high-frequency harmonics and not by fundamental modes of vibrations. Consequently, most train traffic worldwide is expected to generate signals with a significant high-frequency content, in particular in the case of trains traveling at variable speeds that produce truly broadband signals. Proposing a framework for predicting train-generated seismic wavefields over meters to kilometers distance from railways, this work paves the way for high-resolution passive seismic imaging and monitoring at different scales with applications to near-surface surveys (aquifers, civil engineering), natural resources exploration, and natural hazard studies (landslides, earthquakes, and volcanoes).
22
O. Olkhovskaya and K. Butko. "Optimization of Passenger Traffic in a Major Transportation Hub." Herald of the Economic Sciences of Ukraine, no. 2(37) (December 23, 2019): 157–59. http://dx.doi.org/10.37405/1729-7206.2019.2(37).157-159.
Повний текст джерелаАнотація:
The article presents a model for optimizing the activities of railway transport when organizing passenger transportation in a major transportation hub. When optimizing the calculations determine the number of vehicles that are assigned to the node; optimal rates for transportation; the number of transport units in the directions depending on the random demand for transportation. The possibility of attracting additional transport units in case of insufficiency of their own is taken into account. The model takes into account the influence of competitive transport (road). The solution of this problem in general requires the use of statistical modeling and nonlinear programming. Keywords optimization model, statistical modeling, optimal freight rates, non-linear programming.
23
Yugrina, Olga Pavlovna, and Larisa Sergeevna Zharikova. "Features of operation of railway polygon with empty car traffic." Transport of the Urals, no. 1 (2022): 24–29. http://dx.doi.org/10.20291/1815-9400-2022-1-24-29.
Повний текст джерелаАнотація:
The paper considers variants of different technologies of transportation process that are directed on minimization of operating costs and that consider mutual interests of a carrier and consignors of goods. At introduction of such technological measures as concentration of car traffic at stations with sufficient technical possibilities and provision of a minimal number of yard operations in transit with separation of cars by belonging to operators the authors have applied the operations research method and mathematical modeling of transportation process. As a result, the authors have developed a decision making algorithm on organization of operation with the consideration for loading of infrastructure in every design day.
24
Wontorski, Paweł. "Digital design of a railway traffic control system: purpose and scope of digitization." WUT Journal of Transportation Engineering 131 (December 1, 2020): 7–16. http://dx.doi.org/10.5604/01.3001.0014.7039.
Повний текст джерелаАнотація:
The article presents the issue of digitization of the design of railway traffic control systems. Digital design is a key element of digital modeling of railway infrastructure and the future in terms of documenting railway traffic control systems at all stages of its life cycle: concept, design, installation, testing and operation. The digital project is one of the pillars of the concept of the digital twin of the railway system. The need to digitize design results from technological and organizational changes taking place in the railway system. The goal of these changes is to replace traditional methods and techniques for creating a design with modern methods such as BIM. In this sense, the project cannot be further identified with the documentation, but it is a much broader concept that includes a set of data describing the railway traffic control system. The project includes both the mapping of the system - the model, as well as a description of how to implement this model. In order to achieve the main goal of digitization, this process should be carried out in many ways, so that it simultaneously covers the following aspects: (1) design (model), i.e. the subject of design, (2) design system, (3) design process, (4) system environment design system, (5) information exchange between the design system and the environment. The concept of digitization presented in the article requires the full involvement of design offices, infrastructure managers, scientific and research units and due to the extent of the issue it will be a long-term process, but due to the anticipated benefits - inevitable.
25
Zakharov, Dmitriy А. "TRANSPORT MODELLING APPLICATION IN ASSESSING THE EFFICIENCY OF THE TRANS-SIBERIAN RAILWAY TRANSFER BEYOND THE BORDERS OF THE CITY OF TYUMEN." Architecture, Construction, Transport, no. 2(96) (2021): 90–97. http://dx.doi.org/10.31660/2782-232x-2021-2-90-97.
Повний текст джерелаАнотація:
The article discusses the results of simulation at the macro level of the scenario of the Trans-Siberian railway transfer outside the Tyumen. The authors give the analysis of changes in the traffic parameters calculated in the PTV VISUM program for the morning time of the day at the current moment for the option of transferring the railway from the city, and consider the options for increasing the completeness and accuracy of the modeling results for this option of infrastructure development.
26
Mielnik, Ryszard, and Zofia Wróbel. "Integrated power supply system for station equipment of rail traffic control." MATEC Web of Conferences 180 (2018): 05004. http://dx.doi.org/10.1051/matecconf/201818005004.
Повний текст джерелаАнотація:
Railway Traffic Control Systems (RTCS) provide a safe, reliable and efficient movement of rolling stock on railway networks. RTCSs are classified as critical process systems. The power supply system is required to provide a high level of power reliability so that a station equipment of an RTCS safely executes the rail traffic process. The article describes typical solutions of power supply of station equipment of RTCSs. Analysis of these solutions led to the development of assumptions and structures for the integrated power supply system of station equipment. Useful tools for the formal modeling of such systems can be Petri Nets. These nets are a graphical and formal tool for modeling, formal analysis, and design of discrete event systems. The basic element of the integrated power system which is described in the article is the Automatic Reserve Switching system (ARS system). The ARS controller Marked Petri Net (ARS controller MPN) that has been developed by the authors is presented here. The net was subject to reduction resulting in an ARS controller hierarchical simplified MPN. The article also presents the practical application of the ARS controller built using the hardware platform and graphical programming environment LabView National Instruments (NI).
27
Asalkhanova, Tatyana Nikolaevna, and Andrey Alexandrovich Oskolkov. "Organization of transport production of permanent way work with the consideration for information modeling." Transport of the Urals, no. 3 (2021): 65–67. http://dx.doi.org/10.20291/1815-9400-2021-3-65-67.
Повний текст джерелаАнотація:
The JSC «RZD» Long-term program up to 2025 envisages a digital transformation of railway transport. It dedicates a special attention to information and digital technologies of modeling advanced development of infrastructure for provision of growing traffic, increase of production efficiency, provision of expected result of traffic safety and industry economics in whole. The paper presents a design of the information model for infrastructure control within the framework of introduction of the BIM RZD Automated Control System on the example of organization of transport production of permanent way work.
28
SADEGHI, J., and M. FESHARAKI. "IMPORTANCE OF NONLINEARITY OF TRACK SUPPORT SYSTEM IN MODELING OF RAILWAY TRACK DYNAMICS." International Journal of Structural Stability and Dynamics 13, no. 01 (February 2013): 1350008. http://dx.doi.org/10.1142/s0219455413500089.
Повний текст джерелаАнотація:
Attention is drawn to the fact that the recent increase in axle loads, speed and traffic volume in railway tracks, as well as concerns over passengers' riding comfort and safety have resulted in fresh challenges that are needed to be addressed. These challenges can only be successfully tackled with a more accurate modeling of the dynamic behavior of railway tracks. Although a significant amount of research involving mathematical modeling of railway track dynamics has been conducted in the last two decades, the nonlinearity of track support systems has not been given sufficient attention. This paper is concerned with the effect of nonlinearity of the support sub-layers on the dynamic responses of the railway track. To this end, a railway track model that considers the nonlinear properties of the track sub-layers is developed. Then, a field investigation into the dynamic responses of the railway track system under moving trains is conducted. The effect of the nonlinearity properties of the track support system on the track responses is investigated by comparing the results obtained by the numerical model, with or without consideration of track support nonlinearity, with those from the field tests. It is illustrated that consideration of the nonlinear properties of the track support system improves the accuracy of the calculated responses by a factor of three. It is also shown that the train axle loads and track accumulative loading have a significant effect on the nonlinearity of the track support system and, as a result, on the modeling of track responses.
29
Li, De Wei, and Bao Ming Han. "Modeling Queue Service System in Pedestrian Simulation." Advanced Materials Research 187 (February 2011): 1–6. http://dx.doi.org/10.4028/www.scientific.net/amr.187.1.
Повний текст джерелаАнотація:
Pedestrian simulation is widely used on the assessment of facility design and crowd safety control. It proposed a grid-based model of queue simulation system considering human physiology and psychology. Both logic queue system and animation queue system are modeled separately. Deadlock deal mechanism is designed. The proposed model established a good interface between the pedestrian behavior, queue system and animation. It can reproduce phenomenon like traffic shock wave effectively. A case study is shown by simulation of ticket vendor machine layout assessment in Beijing South Railway Station. It concluded that the model is effective and adapted to large scale systems.
30
Bychkov, Igor, Alexander Kazakov, Anna Lempert, and Maxim Zharkov. "Modeling of Railway Stations Based on Queuing Networks." Applied Sciences 11, no. 5 (March 9, 2021): 2425. http://dx.doi.org/10.3390/app11052425.
Повний текст джерелаАнотація:
Among the micro-logistic transport systems, railway stations should be highlighted, such as one of the most important transport infrastructure elements. The efficiency of the transport industry as a whole depends on the quality of their operation. Such systems have a complex multi-level structure, and the incoming traffic flow often has a stochastic character. It is known that the most effective approach to study the operation of such systems is mathematical modeling. Earlier, we proposed an approach to transport hub modeling using multiphase queuing systems with a batch Markovian arrival process (BMAP) as an incoming flow. In this paper, we develop the method by applying more complex models based on queuing networks that allow us to describe in detail the route of requests within an object with a non-linear hierarchical structure. This allows us to increase the adequacy of modeling and explore a new class of objects—freight railway stations and marshalling yards. Here we present mathematical models of two railway stations, one of which is a freight railway station located in Russia, and the other is a marshalling yard in the USA. The models have the form of queuing networks with BMAP flow. They are implemented as simulation software, and a numerical experiment is carried out. Based on the numerical results, some “bottlenecks” in the structure of the studied stations are determined. Moreover, the risk of switching to an irregular mode of operation is assessed. The proposed method is suitable for describing a wide range of cargo and passenger transport systems, including river ports, seaports, airports, and multimodal transport hubs. It allows a primary analysis of the hub operation and does not need large statistical information for parametric identification.
31
Galinurov, Rishat Zinfirovich, and Anton Nikolaevich Popov. "Study of level crossing safety installation operation parameters on the basis of stochastic modeling." Transport of the Urals, no. 2 (2022): 42–49. http://dx.doi.org/10.20291/1815-9400-2022-2-42-49.
Повний текст джерелаАнотація:
Reasons that lead to delay of motor transport at a closed railway crossing and to increase of a number of transport accidents at road level intersections are caused by the imperfection of the currently used method for calculation of parameters of level crossing safety installations. The paper proposes a probabilistic method for studying level crossing safety installations that considers parameters of railway transport traffic. For the creation of a stochastic model the authors have applied the Petri nets theory. Besides they have considered issues of analytical studying of the model on the basis of the graph theory and the theory of semi-Markovian processes. As a result, on the basis of stochastic modeling the authors have calculated parameters of devices for a level crossing safety installation.
32
Gaied, Mouhaned, Anis M’halla, Dimitri Lefebvre, and Kamel Ben Othmen. "Robust control for railway transport networks based on stochastic P-timed Petri net models." Proceedings of the Institution of Mechanical Engineers, Part I: Journal of Systems and Control Engineering 233, no. 7 (January 25, 2019): 830–46. http://dx.doi.org/10.1177/0959651818823583.
Повний текст джерелаАнотація:
This article is devoted to the modeling, performance evaluation and robust control of the railway transport network in Sahel Tunisia. The regular increase in the number of passengers makes the management of transportation systems more and more complex. Railway transport requires specific needs. Indeed, many decision and optimization problems occur from the planning phase to the implementation phase. Railway transport networks can be considered as discrete event systems with time constraints. The time factor is a critical parameter, since it includes schedules to be respected in order to avoid overlaps, delays and collisions between trains. The uncertainties affect the service and the availability of transportation resources and, consequently, the transport scheduling plan. Petri nets have been recognized as powerful modeling and analysis tools for discrete event systems with time constraints. Consequently, they are suitable for railway transport systems. In this article, stochastic P-time Petri nets are used for the railway transport networks in Sahel Tunisia. A global model is first detailed. Then, this model is used to analyze the network traffic and evaluate the performance of the system. Robustness again disturbances is introduced and a control strategy is developed to reduce the consequences of the disturbances in order to maintain the expected schedule.
33
Kalmykov, Mikhail, Evgeny Korovyakovskiy, Anton Polyakov, and Jacek Sholtysek. "Development of Kupchino Intermodal Passenger Transport Hub." Proceedings of Petersburg Transport University 19, no. 1 (March 24, 2022): 56–67. http://dx.doi.org/10.20295/1815-588x-2022-19-1-56-67.
Повний текст джерелаАнотація:
Purpose: Analysis of the current transport system in the intermodal hub and development of a proposal for the redistribution of passenger traffic in the intermodal hub of Kupchino with an increase in the capacity of the node in the conditions of passenger traffic increase that occurred because of the following: larger frequency in time schedule of passenger suburb trains in Vitebsk direction and population increase on the adjacent territory. Analysis of metro capacity and identification of “bottlenecks” of passenger traffic of station platform. Methods: Modeling in Anylogic, statistical research. Results: Imitative model of Kupchino intermodal hub using urban ground transport. Proposal has been developed to redistribute passenger traffic within Kupchino transport intermodal hub by building a concourse over the railways and the underground station adjacent to shopping and entertainment complexes with expansion of the list of services for passengers. Analysis and discovery of bottleneck number in the intermodal hub and method for their elimination is made. Scheme for the intermodal hub development, taking into account of intra-city railway communication, is proposed. Practical significance: The development of Kupchino intermodal hub in the context of passenger traffic increase, raise of underground entrance capacity, creation of new jobs. Formation of accessible and comfortable transport infrastructure for to serve passengers of all population groups, including those with limited mobility.
34
Christoforou, Zoi, Pierre-Adrien Collet, Bachar Kabalan, Fabien Leurent, Axelle de Feraudy, Awzan Ali, Thilo Jessaï Arakelian-von Freeden, and Yuelu Li. "Influencing Longitudinal Passenger Distribution on Railway Platforms to Shorten and Regularize Train Dwell Times." Transportation Research Record: Journal of the Transportation Research Board 2648, no. 1 (January 2017): 117–25. http://dx.doi.org/10.3141/2648-14.
Повний текст джерелаАнотація:
The longitudinal distribution of passengers waiting on a train platform influences the boarding and alighting time. A smoother, more uniform distribution could benefit both traffic operations and passenger experiences. This paper investigates pedestrian traffic performance and the train operations that it influences in an integrated way by proposing ( a) two in situ solutions to inform passengers and influence their waiting position on the platform, ( b) a specific survey of passenger behavior under these conditions, ( c) a modeling scheme based on a pedestrian microsimulation, and ( d) an example of application to a suburban rail station in eastern Paris, the Noisy–Champs Station on the Réseau Express Régional (RER) A Line. The example reveals a traffic phenomenon of corridor–car interplay that implicates the specific behavior of late passengers and the contribution of this phenomenon to train dwell time.
35
Shaikina, E. A. "Developing a mathematical model for managing railway freight traffic in the multimodal transportation system." Bulletin of scientific research results, no. 4 (December 2020): 44–56. http://dx.doi.org/10.20295/2223-9987-2020-4-44-56.
Повний текст джерелаАнотація:
Objective: To develop a mathematical model of the functioning of the freight traffic subsystem interconnected with the general freight transportation model on the basis of the accepted basic assumptions and conditions, since the main type of interaction of the general system with a particular system (subsystem) is the application of constraints on the particular model parameters imposed by the requirements for the quality of the general model functioning according to the nomenclature, service level, and time characteristics of customer service, which are external to the modeled transportation subsystem. Methods: Analysis, synthesis, abstraction, comparison, and mathematical modeling methods were used. Results: A mathematical model of the functioning of a transportation subsystem has been created, taking into account the necessary restrictions imposed by the Russian Railways general functioning model. The complete package of source data required for the practical implementation of this mathematical model as applied to railway transportation is available in the data stores of the main data processing center of Russian Railways. Existing numerical methods for solving such higher dimensional systems of equations make it possible to obtain a numerical implementation of such a model. The proposed model can serve the purposes of assessing the efficiency of the transportation subsystem, since it makes it possible to assess the mathematical expectations of the numbers of each of this system's states at any given time. Practical importance: The practical result of applying the developed model should be quantitatively substantiated recommendations for solving the main problems of choosing a transportation provider when planning multimodal transportation process, as well as for current and future transportation management under given conditions
36
Kornienko, N. V., and M. I. Mekhedov. "Choice of the interval traffic control system in terms of increasing demands for the coverage of forecast traffic volumes." Russian Railway Science 81, no. 1 (March 29, 2022): 63–70. http://dx.doi.org/10.21780/2223-9731-2022-81-1-63-70.
Повний текст джерелаАнотація:
Introduction. The authors view methodology disadvantages for the calculating the existent traffic capacity of the single track analytically by defining the limiting space interval. The current calculation methodology does not fully consider the factors influencing the traffic organization. Thus, this method implies that all trains or pairs of trains evenly distribute the traffic capacity does not corresponding to the real situation. Railway sections should have some reserve capacity that provides carriage in condition of actual traffic volume.Materials and methods. The authors proposed a new approach for determining the traffic capacity by the situation modeling through the alternate graph of train traffic and in accordance with various factors effecting the traffic capacity. Moreover, the authors carried out a comparative analysis of the transportation process indicators. They used two variants of the interval control system — automatic and semi-automatic blocking — in irregular traffic conditions.Results. The performed simulation modeling demonstrates that the use of semi-automatic blocking train interval control does not secure the planned train traffic capacity through the single-track designed line in difficult climatic conditions.Discussion and conclusion. The automatic blocking is considered more appropriate for the train interval control system. The mentioned blocking will provide not only the required capacity, but also the possibility of diagnosing the state of the trackway integrity. It is an important issue providing train traffic safety at low temperatures.
37
Shevchenko, D. V., M. A. Kudryavtsev, A. M. Orlova, S. A. Ponomarev, A. M. Sokolov, and Yu V. Savushkina. "Numerical modeling of the dynamics of the clutch couplers." Vestnik of the Railway Research Institute 78, no. 3 (July 28, 2019): 155–61. http://dx.doi.org/10.21780/2223-9731-2019-78-3-155-161.
Повний текст джерелаАнотація:
One of the priorities of the program “Strategy for the development of railway transport in the Russian Federation until 2030” is the introduction and development of heavy haul traffic, allowing to ensure the increasing volume of freight traffic and significantly improve the efficiency of railways. Main challenges for scientific research and design development to ensure the creation of freight cars for heavy haul traffic, along with an increase in longterm load and decrease in tare weight, include the issue of increasing the load from the wheelset to the rails to 27 tons for heavy haul cars SA-3T and couplers SA-3. It is shown that increasing the load from the wheelset to the rails up to 27 tons while maintaining the dynamic running load within the normalized values can be achieved by increasing calculated deflection of the spring suspension of the truck, which in turn leads to an increase in the possible height difference between the couplings of adjacent cars. Authors explain necessity of putting into operation a coupler for heavy haul cars SA-3T, providing an increase in the vertical coupler contour line up to 210 mm. Regulatory documents governing the provisions of automatic coupling devices in freight cars were analyzed. Dynamic computational models have been developed that describe the behavior of automatic couplings in the process of coupling cars, taking into account the inertial characteristics of all parts included in the assembly, the geometric nonlinearity associated with their contact interaction, and the elastic-damping properties of the absorbing device. Verification of calculated dynamic model has been carried out. Numerical experiments simulating the coupling of the considered automatic coupling devices with the most unfavorable possible combinations of horizontal deviations and rotation angles were performed. It is confirmed that the developed design of the coupler CA-3T provides grip when there is a possible difference between the lower surfaces of the locks of adjacent coupler up to 210 mm both between themselves and with the typical coupler CA-3.
38
Kukulski, Jacek, Marianna Jacyna, and Piotr Gołębiowski. "Finite Element Method in Assessing Strength Properties of a Railway Surface and Its Elements." Symmetry 11, no. 8 (August 6, 2019): 1014. http://dx.doi.org/10.3390/sym11081014.
Повний текст джерелаАнотація:
Development of railway infrastructure at the turn of the 20th and 21st centuries, as well as the speeds of trains in passenger and freight traffic are the result of improving the structure of modern rail vehicles and railway infrastructure optimization. The structure of the railway surface, which enables high speeds and transferring ever greater loads and pressures of up to 25–30 t/vehicle axis, must meet very strict strength and durability requirements. This paper discusses mathematical and numerical tools used in simulation and experimental tests of railway surfaces, as well as its selected elements. Issues addressed in this paper concern, among others, modeling of the railway track, calculations related to its static and dynamic loading, and simulation of the technological process of selected elements of railway turnout. Selected results of the simulation tests on numerical models showing their behavior under different loads are also presented in this paper. The concept of symmetry is included in the possibility of applying the method described in the article both for testing other sections of railway lines, as well as for testing other elements in which stresses occur.
39
Zakharov, D. A., A. A. Fadyushin, and D. A. Zvezdin. "Substantiationof a set of measures aimed at improving the traffic management on the Tyumen Ring Highway." Вестник гражданских инженеров 17, no. 2 (2020): 181–86. http://dx.doi.org/10.23968/1999-5571-2020-17-2-181-186.
Повний текст джерелаАнотація:
The paper considers the option of improving the quality of transport services for the city of Tyumen residents by means of increasing the roadway capacity of the Tyumen Ring Highway. To select the most effective option, there was used transport modeling at the micro level. The analysis of changes in traffic parameters with the prohibition of through traffic at the intersection Bypass of the city of Tyumen - Avtoremontnaya and Troitskaya streets. Two options for organizing the entry from Internatsionalnaya Street to the overpass through the Trans-Siberian Railway in the alignment of the Tyumen Ring Road are considered.
40
Bykov, Artem, Anastasia Grecheneva, Oleg Kuzichkin, Dmitry Surzhik, Gleb Vasilyev, and Yerbol Yerbayev. "Mathematical Description and Laboratory Study of Electrophysical Methods of Localization of Geodeformational Changes during the Control of the Railway Roadbed." Mathematics 9, no. 24 (December 8, 2021): 3164. http://dx.doi.org/10.3390/math9243164.
Повний текст джерелаАнотація:
Currently, the load on railway tracks is increasing due to the increase in freight traffic. Accordingly, more and more serious requirements are being imposed on the reliability of the roadbed, which means that studies of methods for monitoring the integrity of the railway roadbed are relevant. The article provides a mathematical substantiation of the possibility of using seismoelectric and phasemetric methods of geoelectric control of the roadbed of railway tracks in order to identify defects and deformations at an early stage of their occurrence. The methods of laboratory modeling of the natural–technical system “railway track” are considered in order to assess the prospects of using the presented methods. The results of laboratory studies are presented, which have shown their high efficiency in registering a weak useful electrical signal caused by seismoacoustic effects against the background of high-level external industrial and natural interference. In the course of laboratory modeling, it was found that on the amplitude spectra of the output electrical signals of the investigated geological medium in the presence of an elastic harmonic action with a frequency of 70 Hz, the frequency of a harmonic electrical signal with a frequency of 40 Hz is observed. In laboratory modeling, phase images were obtained for the receiving line when simulating the process of sinking the soil base of the railway bed, confirming the presence of a transient process that causes a shift in the initial phase of the signal Δφ = 40° by ~45° (Δφ’ = 85°), which allows detection of the initial stage of failure formation.
41
Cheng, Xiaoyun, Yu Cao, Kun Huang, and Yuejiao Wang. "Modeling the Satisfaction of Bus Traffic Transfer Service Quality at a High-Speed Railway Station." Journal of Advanced Transportation 2018 (July 16, 2018): 1–12. http://dx.doi.org/10.1155/2018/7051789.
Повний текст джерелаАнотація:
Bus transit is one of the main transfer modes at high-speed railway (HSR) stations. Performing a scientific and reasonable evaluation of the present bus traffic transfer service is highly significant for improving the efficiency of the HSR and increasing the use of the system. This paper focuses on the passengers’ transfer experience and proposes a methodology to evaluate current bus traffic transfer service. Factors that affect passenger satisfaction during the bus transfer process at HSR stations based on the passengers’ perceptions are analyzed by convenience, comfort, safety, service, and economy. A structural equation model (SEM) is developed as an evaluation approach to explore the correlations of bus transfer service, passenger perceived value, and passenger satisfaction. To calibrate the model, a questionnaire survey of passengers transferring to a bus was conducted at Xi’anbei Railway Station. This paper analyzes the relationships between observed variables and latent variables in the measured model, the influences of exogenous variables on endogenous variables in the structural model, and the impact of the passengers’ socioeconomic attributes on passenger satisfaction. Analysis results of the SEM show that economy and convenience are the critical influential indicators of passenger satisfaction, among which bus fare preferential policy and transfer distance are the most significant factors. The findings can provide helpful information for planners and managers to improve the services of existing HSR stations and to guide the planning of new ones.
42
Lee, Hsiao Mun, Wensheng Luo, Jinlong Xie, and Heow Pueh Lee. "Urban Traffic Noise Mapping Using Building Simplification in the Panyu District of Guangzhou City, China." Sustainability 14, no. 8 (April 8, 2022): 4465. http://dx.doi.org/10.3390/su14084465.
Повний текст джерелаАнотація:
This study constructed an urban traffic noise map (including road and railway traffic noises) of the Panyu District in Guangzhou City by combining field measurement and numerical modeling methods. This noise map was then used to identify the area covered by different noise quality levels and the compliance rate of traffic noise in various acoustic environment functional areas throughout the day, night and day–night. The results showed that traffic noise pollution along the traffic arteries was severe. The area with heavy noise pollution was as large as 157.5 km2 (29.72%) and 146.2 km2 (27.59%) in the day and night, respectively. The total area of the Panyu District that complied with the noise limit in the day and night was 326.5 km2 (61.62%) and 87.2 km2 (16.46%), respectively. The outcomes of the current efforts can provide new technical guidelines for novel construction and analysis methods for large scale urban traffic noise mapping.
43
Zhang, Jian, Chun Jing Ma, Xiang Feng Ji, and Gang Zhong. "Modeling and Sensitivity Analysis for Railway Passengers’ Public Transit Mode Choice." Applied Mechanics and Materials 641-642 (September 2014): 678–84. http://dx.doi.org/10.4028/www.scientific.net/amm.641-642.678.
Повний текст джерелаАнотація:
Comprehensive terminal integrates different modes of transport and sharing rates of different traffic modes influence its planning greatly. To determine the sharing rates, it’s necessary to study mode choice probability of passengers. Based on the theory of disaggregate choice, with the survey of mode choices of passengers arriving by rail in Nanjing south railway station, this paper establishes multinomial logit (MNL) model and nest logit (NL) model, considering three types of modes of transport including the subway, regular bus, and taxi. Models are calibrated with SPSS and validated through statistical indicators. Therefore, important factors influencing choice are obtained. The accuracy test results of two kinds of models show that NL model has higher prediction accuracy, and can overcome the shortcomings of traditional logit model’s independent and irrelevant alternatives (IIA). Finally, this paper develops the sensitivity analysis using the NL upper model as an example, and gives the sensitivity physical meaning, namely the development level of taxi.
44
Suslov, K. V., A. G. Logacheva, Yu N. Zatsarinnaya, V. A. Gladkikh, A. I. Karlina, and K. A. Baraboshkin. "Improvement of the power grid system of the East Siberian Railway." Journal of Physics: Conference Series 2176, no. 1 (June 1, 2022): 012039. http://dx.doi.org/10.1088/1742-6596/2176/1/012039.
Повний текст джерелаАнотація:
Abstract The foreign experience analysis and the mathematical modeling system use have shown that the use of virtual coupling train driving technology will increase line section by an average of 10 to 40%, depending on the energy network and traffic schedule saturation. For a batch schedule consisting, we reduce the interval to the minimum value. According to the calculation results of the power network system operating modes, it is clear that all the traction network characteristics accept the permissible norms.
45
Tang, Tie-Qiao, Yi-Xiao Shao, Liang Chen, and Hua-Yan Shang. "Modeling Passengers’ Boarding Behavior at the Platform of High Speed Railway Station." Journal of Advanced Transportation 2017 (2017): 1–11. http://dx.doi.org/10.1155/2017/4073583.
Повний текст джерелаАнотація:
Modeling passengers’ motion at high speed railway (HSR) station has been a hot topic in the field of pedestrian flow theory. However, little effort has been made to explore the passengers’ boarding behaviors at the platform of HSR station. This study proposes a cellular automaton (CA) model to study the passengers’ boarding behavior at the platform of HSR station. Some numerical tests are conducted to explore the passengers’ movements and the complex traffic phenomena (e.g., each passenger’s trajectory, congestion, and travel time) which occur during the boarding process. The numerical results illustrate that the passengers’ inflow rate and entrance choice behavior have significant impacts on the boarding efficiency. These results can help managers to understand the passengers’ boarding behavior and to improve the boarding efficiency.
46
Moiseenko, Valentin, Оleksandra Golovko, Volodymyr Butenko, and Karyna Trubchaninova. "Modeling of vehicle movement in computer information-control systems." RADIOELECTRONIC AND COMPUTER SYSTEMS, no. 1 (February 23, 2022): 36–49. http://dx.doi.org/10.32620/reks.2022.1.03.
Повний текст джерелаАнотація:
The subject of the article is the processes of synthesis of a mathematical model of control objects functioning in computer information-control systems of critical purpose for the needs of high-speed railway transport. The main emphasis is on modeling the movement of a passenger train in the high-speed system of Ukrzaliznytsia. The aim is to study the process of regulating the speed of railway vehicles under conditions of uncertainty in the primary information of microprocessor information-control systems of railway transport. Tasks: determination of the criterion of the safety of railway vehicle auto control; obtain a mathematical model of train movement under conditions of uncertainty; check the adequacy of the model. The method used is the mathematical apparatus of discrete models. The following results have been obtained. The mathematical model of train movement developed in this work includes not only information on train position, reference point, direction, and speed of the vehicle but also a variable control indicator to reflect the process of railway traffic adequately. The study shows that, based on the synthesized model, it is possible to use the so-called fuzzy distance between adjacent trains. This approach improves the accuracy of determining the critical distance between trains, the time required to eliminate the risk of collision, the start time of braking, and braking time considering the angle of inclination of the track, as well as the distance of the braking distance. The necessity to determine the control indicator, its value for many points of time, while there is a reduction in speed for the safe movement of trains. Based on the proposed mathematical model, a computer simulation of the process was performed to determine the required time reserve for the train driver to respond to changes in the speed of the previous train, as well as speed ranges that require immediate emergency action. Conclusions. The scientific novelty of the obtained results is the development of a mathematical model of the behavior of mobile units in computer systems for critical use for the needs of railway transport in the presence of failures in the primary information from sensors that record motion parameters. The behavior of the control system at different values of train speed and changes in the value of the interval of the accompanying journey is studied. The theory of traction calculations in computer control systems for mobile units has been further developed. The obtained scientific results will be used in the development of an application program for many critical computer systems for railway.
47
Kovalev, K. E., and A. V. Novichikhin. "volution of scientific and technical foundations for the transport system efficiency improvement with the interaction of heavy- and low-traffic lines." Proceedings of Petersburg Transport University 2021, no. 2 (June 2021): 169–76. http://dx.doi.org/10.20295/1815-588x-2021-2-169-176.
Повний текст джерелаАнотація:
Objective: The solutions to the problem of low-traffic railway lines functioning has been considered, and the approach to improving the efficiency of the transport system with the interaction of heavy- and low-traffic lines has been characterized. The transport network management principles have been developed and the mathematical formulation of the problem of increasing the low-traffic lines efficiency has been carried out. The authors have supplemented the classification of existing low-traffic lines in order to develop more accurate scenarios for increasing profitability and promoting development of low-traffic lines. The article provides a graphic model of heavy- and low-traffic lines management, a control system comprising structural divisions of JSC Russian Railways and regional authorities, taking into account external factors, the demands of the population and enterprises in transportation and their satisfaction, and technical, technological and information resources. Methods: Methods of analysis and synthesis, systems theory, and mathematical modeling have been used. Results: The conceptual structure of the management model for heavy- and low-traffic lines is proposed. Practical importance: A set of indicators for assessing the low-traffic lines performance characteristics is provided, including quantitative technical, technological and economic parameters, as well as indicators for assessing the quality of transport services. The railway line life cycle stages have been determined and the development and operation scenarios for the low-traffic lines have been given.
48
Osa, Piotr, Jerzy Wojciechowski, Marek Wójtowicz, and Nikolai Osmolovskii. "Modeling of the operation of the reserve source of electric energy of railway traffic control devices." AUTOBUSY – Technika, Eksploatacja, Systemy Transportowe 19, no. 12 (December 31, 2018): 579–84. http://dx.doi.org/10.24136/atest.2018.456.
Повний текст джерелаАнотація:
The article presents issues related to the problem of modeling the work of a reserve source of electric energy for railway traffic control devices. The problems of srk devices and the construction and concept of powering them into electricity were outlined. The basic part presents a simulation model of the operation of a generator set, used as a reserve power source. Modifications of the model to work in the most important operating conditions are shown. The results of simulation calculations are presented.
49
Syslov, O. A., and V. I. Fedorova. "Prospective approaches to predictive modeling of degradation processes of track superstructure elements and its application in creating digital twins." VNIIZHT Scientific Journal 80, no. 5 (October 26, 2021): 251–59. http://dx.doi.org/10.21780/2223-9731-2021-80-5-251-259.
Повний текст джерелаАнотація:
It’s impossible to use digital technologies without using the amount of information coming from various systems designed to manage the transportation process and plan its work, taking into account modern economic requirements and resource constraints. Digital twins are currently the most promising tool for solving the problems of managing technically rich multi-level assets, which include railway transport. The track facilities are one of the most expensive assets, and the issues of organizing the management of the maintenance of the railway track are very acute, since they are directly related to the safety of train traffic, therefore, the development of a digital twin of the railway track is a priority task for track science. A digital twin of a railway track should contain elements of BigData technology in the form of arrays of diagnostic data coming online from mobile and stationary diagnostic tools, an array of passport data about the track device, as well as a set of models that can convert this data into matrices “state — action”, suitable for making organizational and technical decisions on the management of the track complex, starting from the level of linear enterprises and ending with network tasks. The article presents models that can be taken as a foundation for building digital twins of a railway track. The results of verification and approbation of the proposed models in the “Neyroekspert-Put’” software package are also presented.
50
Alexandrov, Alexander Ernstovich, Igor Alexandrovich Kovalev, Vadim Yuryevich Permikin, Alexander Vladimirovich Surin, and Vladislav Vladislavovich Lesnykh. "Logic verification of optimization model of car traffic processing at marshalling station." Transport of the Urals, no. 2 (2022): 17–22. http://dx.doi.org/10.20291/1815-9400-2022-2-17-22.
Повний текст джерелаАнотація:
Mathematical modeling is widely spread among studies dedicated to operational planning on the railway transport. In short-term planning of marshalling station operation heuristic algorithms and simulation modeling are mainly used. It is possible to improve the quality of planning on the basis of models of strict optimization. The authors have created both a mathematical and a computer model of car traffic processing at a marshalling station with the use of mixed integer linear programming. For the realization of the computer model the authors have used a package of applied programs. The paper considers verification of the model. This procedure is necessary for revealing possible technical and content mistakes in a computer realization of a mathematical model. The authors have made the emphasis on revealing content mistakes in marshalling station operation. For the verification of the model the authors have used a logic approach.