Transport Technologies. – 2020. – Vol. 1, No. 1

Permanent URI for this collectionhttps://ena.lpnu.ua/handle/ntb/51078

Журнал створено у 2020 році у Національному університеті «Львівська політехніка». Періодичність видання двічі на рік. Випуск номерів журналу здійснюється англійською мовою.

Transport Technologies. – Lviv : Lviv Politechnic Publishing House, 2020. – Volume 1, number 1. – 103 p. : il.

Transport Technologies

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    The impact of parameters of traffic flows of Lviv street-road network on the level of environmental and economic losses
    (Видавництво Львівської політехніки, 2020-02-26) Kachmar, Roman; Lanets, Olena; Lviv Polytechnic National University
    The analysis of directions and effectiveness of various methods of examining the impact of the urban street-road network on the level of eco-pollution was carried out with the use of the method of determining environmental and economic losses from changes in traffic flow indicators. The method of estimating the environmental damage dynamics due to harmful emissions of vehicles was applied. On the basis of conducted researches, practical recommendations were developed for such variants: prohibition of private transport motion on the road section, increasing the amount of electric transport, reducing the average age of vehicles to the accepted European level.
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    Pedestrian and cyclist flows interaction in the urban street and road network
    (Видавництво Львівської політехніки, 2020-02-26) Sotnikova, Anna; Francke, Angela; Lviv Polytechnic National University; Technische Universität Dresden
    Due to the active popularization of sustainable urban mobility principles, there is an increase in the share of bicycle traffic in the overall modal split. The pedestrians are getting used to the fact that the cyclist is a full member of the traffic and has his/her own separate space. The concequence of this is cyclist and pedestrian flows conflicts. The article analyses the results of field research of cycling and pedestrian traffic volume. The permissible number of conflicts between them is defined, which makes it possible to understand the principles of combination or separation of flows in space. Based on the results obtained, recommendations for the design and arrangement of cycling and pedestrian infrastructure are provided.
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    Increasing the complex intersections functioning efficiency by restriction of left-turn traffic flows
    (Видавництво Львівської політехніки, 2020-02-26) Lobashov, Oleksii; Boikiv, Mykola; O. M. Beketov National University of Urban Economy in Kharkiv; Lviv Polytechnic National University
    Providing rapid and safe traffic in cities requires the use of a set of planning and organizational measures. While the implementation of architectural-planning measures requires, except for significant investments, a quite long period, organizational measures can lead to a temporary but relatively rapid effect. For this purpose, an analysis of traffic flow metrics on the approaches to the intersection, traffic light cycle, and the traffic phasing is carried out. Conducted research indicates that left-turn flows cause significant delays and reduce traffic safety at the intersection. Therefore, increasing the efficiency of the crossroads needs redevelopment measures by restriction of the left-turn flows on the main road, change of the traffic flows phasing and optimizing the traffic light cycle. In the presence of adjacent intersections, the scheme of left turn realization is developed. The simulation of intersection functioning in existing conditions and under the change of left-turn flows movement organization is carried out in the PTV Vissim software environment. It is established that restriction of the left-turn flows at the controlled intersection allows to optimize the traffic light cycle and equip it so that the average delay for traffic flows will decrease in comparison with the current state.
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    To determination of traffic delay at controlled intersection
    (Видавництво Львівської політехніки, 2020-02-26) Fornalchyk, Yevhen; Hilevych, Volodymyr; Lviv Polytechnic National University
    Taking into account the importance of time spent on passing distances of vehicle routes that lie across city road network (RN), well-known approaches to the determination of vehicle delay in the movement process (waiting for passage and the passage) of controlled intersections are analyzed. Reasons that cause the growth of these delays and that have an impact on traffic light cycle duration are counted. At the same time, the authors justify the need for change in the existing term transport delay. It should be interpreted (concerning intersection passage) as a delay only in the case when the group of vehicles that have stopped before intersection could not pass this intersection during the permission signal and wait for the next such signal. If the vehicles in the first group could pass the intersection (possibly taking into account also waiting for the permission signal), then this is not a delay but the necessary component of the technological process of the route passage. From this point of view, an approach in the traffic delay determination method at controlled intersections is proposed taking into account the particular components of Webster`s formula and the volume-capacity ratio of RN that determine the motorization level of the city population. A comparison of the results of delay calculation, determined with the use of the proposed method and Webster’s formula, is carried out.
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    About passenger travels demand modeling in urban transportation systems
    (Видавництво Львівської політехніки, 2020-02-26) Zhuk, Mykola; Pivtorak, Halyna; Lviv Polytechnic National University
    In this paper, the basic concepts of modeling of urban transport systems are analyzed. The known variants of the definition of the concept of the transport system, its main components and the essence of the stages of identification of transport systems (TS) are presented. The example of the Lviv city TS shows the process of modeling the transport network, determining the time characteristics of the modeled transport system and forming a demand matrix for trips of a certain type in a certain segment of users (origin-destination matrix when moving students from their places of compact residence to the nodes of external transport for further implementation of intercity travel). The obtained indicators can be further applied in determining the demand for transportation in transport systems of large cities.
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    Change of drivers functional condition while moving along highways of different technical categories
    (Видавництво Львівської політехніки, 2020-02-26) Krystopchuk, Mykhailo; National University of Water and Environmental Engineering
    The article analyzes the influence of a human factor on road safety and the main methods of its research. The main indicators of the functional state of the drivers, which most accurately illustrate the change in the neuro-emotional stress while operating the vehicle in different road conditions, are determined. The regularities of changing the functional state of the drivers who were driving the vehicle along different categories of roads were established. It is revealed that the geometric features of the highway that determine its category have a significant impact on the performance of drivers, and, consequently, on the reliability of their work. The results of this research provide an opportunity to predict the functional state of the driver under different road conditions, as well as to adjust the routes of traffic of vehicles and the mode of work and rest of drivers.
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    Impact of street parking on delays and the average speed of traffic flow
    (Видавництво Львівської політехніки, 2020-02-26) Hrytsun, Oleh; Lanets, Oleksii; Solodkyy, Serhiy; Lviv Polytechnic National University
    The article is devoted to the problem of the impact of street parking on delays and the average speed of traffic flow. The sections with different ways of putting vehicles near the roadway in the central part of Lviv city with the most saturated flow were exposed to scientific scrutiny. For this purpose, the program software PTV Vissim is used. The causes of the impact of street parking on traffic flow speed and roadway capacity are analyzed. Simulation model was created, with the use of which the operation of the street section where parking is allowed and without parking, and also the impact of the parking duration on the average speed of traffic flow and its delays were investigated. It is clarified that the least values the average traffic delay has with the parking duration of 900 and 1800 sec, and the biggest values it has with the duration of 300 sec. It is determined that during the street parking design parallel to the sidewalk it is necessary to implement the restriction of the parking duration to increase the road network capacity and traffic flow speed.
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    Changing of the bus driver`s functional state in city conditions
    (Видавництво Львівської політехніки, 2020-02-26) Postranskyy, Taras; Vovk, Yuliya; Lviv Polytechnic National University
    The functioning of a modern city is impossible without a proper mode of public transport and its network. Parameters of this transport system influence on the functionality of all supply chain links, training specialists, ensuring proper communication between parts of the city, the level of traffic safety, etc. At the same time, all these figures depend also on bus drivers and their work. This is due to the fact that this “human factor” influences on the proper functioning of the public transport system. It should be noted, that one of the indicators that allow analyzing the readiness of the driver to fulfill his direct professional duties is the functional state of his body. Analysis of this indicator allows creating appropriate recommendations for bus driver`s schedules of work and rest. According to this, managers can create such working conditions for drivers that will reduce the likelihood of erroneous actions. It will allow reducing the likelihood of road accidents. That`s why the importance of researching human as an operator in the transport process is increasing every year.
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    Contents
    (Видавництво Львівської політехніки, 2020-02-26)
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    Influence of transportation object position in car body on its vibrational loading
    (Видавництво Львівської політехніки, 2020-02-26) Kindratskyy, Bohdan; Osmak, Oleksiy; Lviv Polytechnic National University
    Dynamic model for research of object transportation location influence on its vibrating loading by moving through a number of single obstacles, road with random microprofile and rough road is offered. Differential equations and methods of their integration in MATLAB Simulink software product are presented. The values of frequencies and amplitudes of vertical oscillations, vibration acceleration of the transportation object at different locations in the vehicle body were obtained. It is found that the amplitude and maximum acceleration have the smallest values when the object is located in the center of gravity of the car, and the largest – above the rear axle (in the cargo compartment). Recommendations were to improve the vibration protection of the transportation object.