Автомобільний транспорт / Автомобильный транспорт

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A review of the automated guided vehicle systems: dispatching systems and navigation concept
(Харківський національний автомобільно-дорожній університет, 2023) Bourafa, Rami; Siegfried, Patrick; Арафа, Рамі; Зігфрід, Патрік
Problem. As one of the three key elements of flexible manufacturing systems (FMS), automated guided vehicles (AGVs) play a significant role in material handling systems. They've been around for more than a decade, primarily in Europe. AGVs were formerly utilized mostly in production lines, but due to recent industrial development, they now play a vital role in a variety of different applications and domains, including warehouses, port facilities, transportation systems, and even the medical sector. Goal. The purpose of the work is to analyze two methods of AGV control and the paths that the AGV should follow during transport operations, taking into account safety and limitations for heavy loads that need to be transported in difficult conditions. Methodology. We attempted to provide a summary of the two existing AGV control methods, centralized and decentralized control offered by major manufacturers in this study. Almost all function in a centralized manner, with a single central controller controlling the whole fleet of AGVs. The author sees a tendency toward decentralized systems in which AGVs make individual decisions in favor of transportation flexibility, robustness, and adaptability. A brief explanation of well-known and mature navigation technologies used by AGVs in the industry is also provided, along with both physical and virtual paths to be followed by the AGV during transportation operations, since these technologies get to be a key issue given the safety constraints, particularly for heavy loads to be transported in challenging environments. Results. This paper covers one of the key tasks that must be completed in order to control an AGV system for a central and decentral architecture, for which we have already given a broad overview, as well as the differences between the architectures and their benefits and drawbacks. Originality. The author sees that the merging of various techniques we have will lead to more and new challenges as well as innovations, however, that practical application of distributed control still requires further research and studies and has a way to go in terms of taking other sections such as safety and sustainability into account. Practical value. The primary benefits and drawbacks of various technologies are discussed, as well as how we might improve the efficiency of some of them.
A STOCHASTIC APPROACH TO EVALUATE THE RELIABILITY OF URBAN PASSENGER TRANSPORTATION SERVICES
(Харьковский национальный автомобильно-дорожный университет, 2017) Kopytkov, D.; Копытков, Д. М.; Копитков, Д. М.
An approach to estimate the reliability of urban passenger transport from the passengers' viewpoint has been presented, in which the parameter to be investigated is the fixed-route headway. The probability of passenger arrival to the destination point has been suggested as an indicator of the service reliability. The given approach makes it possible to evaluate the reliability of both single modes of the urban mass transit and the transportation system reliability as a whole.
ACTIVE SAFETY IN THE SYSTEM OF MOTOR-TRANSPORT SAFETY
(Харьковский национальный автомобильно-дорожный университет, 2016) Stepanov, A.; Степанов, О. В.; Степанов, А. В.
The article considers the impact of active safety on motor-transport safety and on road traffic safety with the purpose of RTA preclusion. The matter of active safety in the system of motor-transport safety is furnished, the main trends in improving traffic safety are determined. While considering the problems of motor transport safety and the problems of improving traffic safety, the need for development of systems that would neutralize any excess control action or even carry out a correction of insufficient control actions of a driver in the «Driver–Vehicle–Road Traffic» system is proven.
Analysing the possibility of using a hydraulic transmission with motor wheels for the nomad at off-roader
(Харківський національний автомобільно-дорожній університет, 2024) Avrunin, Grygoriy; Podrigalo, Mikhail; Podrigalo, Nadia; Moroz, Irina; Potoroka, Anatoly; Аврунін, Григорій Аврамович; Подригало, Михайло Абович; Подригало, Надiя Михайлівна; Мороз, Ірина Іванівна; Поторока, Анатолій Владиславович
Problem. The creation of transport vehicles for operation in difficult road conditions requires solving a complex of problems related to the fulfilment of the necessary requirements for speed and traction characteristics, in particular, shifting modes, overcoming climbs, manoeuvrability and increased speed with its stepless change, anti-skid properties. Such requirements are achieved thanks to constructive solutions in transmissions of various types. Goal. The aim is an attempt to create a full-flow continuously variable transmission with hydrostatic transmission and motor-wheels instead of a step-mechanical one to improve the technical characteristics of the all-terrain vehicle and the technological possibilities of manufacturing the transmission by the block method when using standard components. Methodology. Based on the analysis of the technical characteristics of the analogue all-terrain vehicle with a mechanical multi-gear transmission and a review of achievements in modern hydrostatic transmission with hydraulic motor-wheels, static calculations were carried out to assess the possibility of creating a stepless full-flow hydro volume transmission and building its hydraulic schematic diagram. Calculations are based on mathematical models created on the basis of the laws of mechanics and hydraulics. The results. According to the results of the calculations, it has been shown that it is fundamentally possible to create a stepless hydrostatic transmission for an all-terrain vehicle with the specified traction and speed characteristics. Further research is proposed on the analysis of the dynamics of the hydrostatic transmission of the all-terrain vehicle and the creation of a corresponding experimental model of the vehicle. Originality. For the analogue all-terrain vehicle, the hydraulic motor-wheels required for the working volume were selected, which provide the parameters of traction and speed characteristics and allow creating an original transmission without the use of reducers and gearboxes. Practical meaning. The obtained results are planned to be considered as recommended for carrying out a functional and cost analysis in the design and determination of technological possibilities in the manufacture of a hydrostatic transmission of an all-terrain vehicle. It is also proposed to consider the method of calculating the hydrostatic transmission of an all-terrain vehicle in the educational process for master's students of industrial mechanical engineering when studying the disciplines related to the design of hydraulic drives and their tests.
Analysis of design features of systems and components of the Tesla Model S electric car
(Харківський національний автомобільно-дорожній університет, 2022) Smyrnov, Oleh; Borysenko, Anna; Смирнов, Олег Петрович; Борисенко, Анна Олегівна
Problem. The article analyzes the design features of the systems and components of the Tesla Model S electric car, which allows choosing the initial characteristics for the mathematical model of the acceleration dynamics of the electric car, determines the cost characteristics of its power plant (electric motor) and battery. Goal. The purpose of the work is to determine the initial characteristics of the systems and components of a modern electric vehicle for their further use in a mathematical model of the acceleration dynamics of an electric vehicle. Methodology. The approaches adopted in the work to achieve the set goal include understanding the peculiarities of the initial characteristics of the systems and components of electric vehicles, which are the world leaders in the market of such vehicles. Results. In the work, a comparative analysis of the layout schemes for the implementation of transmissions in the designs of modern electric vehicles, the characteristics of their power plants (electric motors), the characteristics of energy converters (inventories), and the features of the power plant power plant of a modern electric car are determined. Originality. The conducted analysis of the design features of systems and components of the Tesla Model S electric car made it possible to form a general idea about the features of the implementation of work processes in the electric drive of an electric car, which can be used as initial parameters or characteristics during the simulation of the acceleration dynamics of an electric car. Practical value. The obtained results make it possible to formulate recommendations for the use of the characteristics of the systems and components of the electric vehicle during the simulation of the dynamics of its acceleration and to determine the energy consumption in the power system of its traction electric drive.
ANALYSIS OF MOTOR-GRADER LOADING ON THE BASIS OF FRACTAL DIMENSION
(Харьковский национальный автомобильно-дорожный университет, 2016) Polyarus, A.; Paschenko, R.; Poliakov, Е.; Lebedinskyi, A.; Полярус, О. В.; Пащенко, Р. Е.; Поляков, Є. О.; Лебединський, А. В.; Полярус, А. В.; Пащенко, Р. Э.; Поляков, Е. А.; Лебединский, А. В.
The possibility of fractal dimension application for analysis of grader loading modes is con-sidered in the article. The fractal dimensions of experimental dependences of load on the coupling pin of the grader at its different working conditions are calculated. It is determined that the magnitude of the fractal dimension allows to estimate the highest and lowest load of the grader.
ANALYSIS OF NONMAGNETIC METAL INDUCTION HEATING PROCESSES BY FLAT-TYPE CIRCULAR SOLENOIDAL FIELD
(Харьковский национальный автомобильно-дорожный университет, 2016) Batygin, Yu.; Chaplygin, E.; Barbashova, M.; Shinderuk, S.; Gavrilova, T.; Батыгин, Ю. В.; Чаплыгин, Е. А.; Барбашова, М. В.; Шиндерук, С. А.; Гаврилова, Т. В.; Батигін, Ю. В.; Чаплигін, Є. О.; Барбашова, М. В.; Шиндерук, С. О.; Гаврилова, Т. В.
The article analyzes the electromagnetic processes in the system of induction heating with estimating the main characteristics of heating the non-magnetic sheet metal. The analytical expressions for numerical estimates of the induced current in terms of the phase of the excitation signal are presented. The dependence for the heating temperature of the considered circular sheet metal area for the time corresponding to the interval phase has been determined.
ANALYSIS OF POSSIBILITIES TO PRESENT FORMALLY THE ELEMENTS OF VIRTUAL EDUCATIONAL SPACE
(Харьковский национальный автомобильно-дорожный университет, 2017) Morozova, О.; Морозова, О. І.; Морозова, О. И.
For formal representation of virtual educational space elements, the paper considers the topology methods, in particularly the methods for categories and functors theory, allowing for solving semistructured and indeterminate problems and reflecting their results at the high level of abstraction. The conducted analysis shows the virtual educational space as a generalized scheme, including an associative connection of the site of departments and general education schools.
ANALYSIS OF STABILITY OF STEEL MEMBERS WITH ACCOUNT OF THE FIXING CONDITIONS AND SUPPORTS STIFFNESS
(Харьковский национальный автомобильно-дорожный университет, 2017) Kondel, V.; Loboda, D.; Кондель, В. М.; Лобода, Д. О.; Лобода, Д. А.
The authors have studied the stability of compressed steel structures and parts of machines with account of support conditions. The analysis of experimental and theoretical data of the behaviour of compressed structures and their members is provided. The new approaches to the critical-load design with account of supports stiffness are described.
Analysis of structures and application of different types of engines in cars
(Харківський національний автомобільно-дорожній університет, 2023) Kuzhelnyi, Yaroslav; Venzheha, Volodymyr; Pasov, Hennadiі; Klymenko, Valeriy; Кужельний, Ярослав Володимирович; Венжега, Володимир Іванович; Пасов, Геннадій Володимирович; Клименко, Валерій Іванович
Problem. The publication analyzes the structures and application of various types of engines in a car, which allows to determine the structural aspects, features of placement and operation of engines, their future application prospects. Purpose. The purpose of the work is to analyze the design and operation of engines used in modern cars, to determine their advantages and disadvantages, and the prospects for the development and application of various types of engines. Methodology. The approaches adopted in the work to achieve the set goal consist in the analysis of designs of various types of engines of modern cars, their layout and features of their use. Results. The paper includes a comparative analysis of various types of engines used in modern cars. The peculiarity of the design and structure of internal combustion engines, electric cars and hybrid cars is considered. The scheme of the general configuration of electric vehicles, possible configurations of electric vehicles, layout schemes of hybrid cars are given. The advantages and disadvantages of each type of engine, the main prospects for their development and application are shown. Originality. The conducted analysis of the design features of various types of engines that are installed in modern cars allows us to formulate a general idea about the peculiarities of the operation of cars with the considered types of engines. Practical meaning. The obtained results of the analysis and the given advantages and disadvantages in the use of different types of engines allow us to formulate the main directions in the development of structures and the prospects of their application in different types of cars.
Analysis of the load-bearing system of the loader according to the results of dynamic tests in the environment of Ansys motion
(Харківський національний автомобільно-дорожній університет, 2022) Shcherbak, Oleh; Ragulin, Vitaliy; Suminov, Andrii; Щербак, Олег Віталійович; Рагулін, Віталій Миколайович; Сумінов, Андрій Володимирович
Problem. The T-156B hinge frame of the loader, which is an upgraded frame of an agricultural tractor, creates loads during work operations for which it was not designed. Such loads lead to breakdowns and further shorten the life of the entire machine. The frame is the basic element around which the machine is built. The loader that had just been removed from the conveyor did not have builtin durability and reliability. While designing a road construction machine, an account of the features, nature, and conditions of its operation should be taken. Goal. The goal is to develop a hinge frame design technique that takes into account the loads experienced by the frame with a virtual simulation of real-world situations during the loader process. Methodology. The adopted approach is based on the use of a Solidworks computer program with three-dimensional modeling and an Ansys motion program for calculating the dynamics of multicomponent bodies taking into account the hinge and contact interaction. Results. In the work three cases of technological operations of the loader were considered. 1. Lifting a full bucket. 2. Collision with an obstacle that is difficult to overcome 3. Movement over an uneven surface with the raised loader arm. The results of the calculations provided forces and torques in the hinge of the half-frames, as well as the effort of the frame. Based on the results obtained, the endurance of the frame in the Ansys motion software package was calculated. Originality. The analysis of load-bearing systems with a virtual simulation of the machine’s actual behavior with the help of Ansys motion software allows to obtain more accurate results, significantly reducing the time for the design and cost of field testing. Practical value. This approach to the analysis of the carrier system behavior can be recommended for designing and determining the technological capabilities of wheeled, tracked, and special machines.
Analysis of the mechanism of side impact of cars
(Харківський національний автомобільно-дорожній університет, 2023) Shapovalenko, V.; Шаповаленко, Владислав Олексійович
Globally, car crashes are the major cause of death, killing 1.2 million people, and despite improvements in car safety, forecasts indicate that car crash deaths will increase significantly by 2030 due to the increase in the number of cars. Such a trend requires an increase in passive safety in the design of cars. It is also necessary to consider with these factors the most popular segments of SUV cars, which during an accident create more dangerous consequences in the event of a side impact, taking into account the mass and dimensions parameters. Goal. The aim is to conduct an analysis of the side collision mechanism of cars of different mass and dimensional parameters. Taking into account the trends in the sale of cars, identifying the most popular classes of cars in Ukraine both on the new car market and on the second-hand market, to further identify problems in testing cars according to various certification protocols. Methodology. The approaches to solving the tasks used in the work are based on the use of statistical data and comparative analysis of various methodologies and certification protocols. Results. Considering that scientific studies of frontal impact are presented by the scientific community in the broadest form, the study of the side impact of two cars is currently a relevant direction, taking into account the global trend towards the production of cars in the SUV segment, which exceed passenger cars in terms of mass and dimensions. In a road accident with a side impact of a passenger car and an off-road vehicle of the SUV segment, we will get a large difference in the height of the primary impact, which is 250 millimeters. That is, all the energy of the impact to the side of the passenger car falls not on the safety bar, but 250 millimeters higher, which will nevitably lead to fatal injuries to the driver and passenger. Unfortunately, the European NCAP and the US National Highway Traffic Safety Administration use moving barriers that are similar in terms of mass and dimensions to an average passenger car. Originality. The obtained results of the analysis of the mechanism of the car side collision make it possible to evaluate the current trend of the automobile market in terms of passive safety and, in particular, to conduct certification tests for side impact in a new way. Practical value. The obtained results can be recommended when studying the structural features of preparing and conducting crash tests.
Analysis of traffic safety on the roads of the Kharkiv region during the period of martial law
(Харківський національний автомобільно-дорожній університет, 2024) Riabushenko, Oleksandr; Popadynets, Dmytro; Vorontsov, Yaroslav; Рябушенко, Олександр Васильович; Попадинець, Дмитро Миколайович; Воронцов, Ярослав Сергійович
Problem. The functioning of road transport in regions of long-term armed conflicts is associated with additional risks for road traffic safety. The degree of influence of additional risk factors can be investigated by analyzing traffic accident statistics in such a region. Goal. The purpose of the work is to study the impact of martial law conditions on road safety indicators in the Kharkiv region of Ukraine by comparing statistical data on accidents and road deaths due to road accidents. Methodology. To achieve the goal, the work uses methods of statistical analysis of data and construction of trends, methods of determining relative indicators of the severity of road accidents. Results. As a result of the analysis of statistical data on road accidents in the Kharkiv region, the distribution of accident rates for the period from 2019 to 2023 was obtained, which made it possible to reveal their significant differences during the period of martial law compared to previous periods. In particular, it was established that with a decrease in the total number of road accidents, there was an increase in the severity of the consequences of road accidents. This regularity was confirmed by analyzing the relative indicators of road accident severity. The identified differences in accident and death rates on the roads of the Kharkiv region in 2023 compared to the periods before the start of hostilities indicate a change in road traffic conditions. Originality. The paper investigated the impact of martial law conditions on road safety on the example of the Kharkiv region of Ukraine. As a result, the degree of influence of the risk factors that arose as a result of the deployment of the armed conflict on the increase in the level of danger for road users was established. Practical value. The obtained results can be used for planning and implementation of measures to ensure traffic safety on highways in regions that are the zone of long-term armed conflicts.
Assessment of impact of priority movement for urban public passenger transport on the quality of passenger service
(Харківський національний автомобільно-дорожній університет, 2023) Vdovychenko, Volodymyr; Ivanov, Igor; Pidlubnyi, Serhii; Vasyliev, Mykyta; Вдовиченко, Володимир Олексійович; Іванов, Ігор Євгенович; Підлубний, Сергій Юрійович; Васильєв, Микита Костянтинович
Problem. The article presents a view on solving the problem of the management formation measures to improve the quality of public transport services through the feasibility justification of im plementing priority movement of urban public passenger transport in relation to the assessment of pas sengers' perception of the actual travel time along the route. Goal. The purpose of the work is to estab lish a characteristic relationship between the traffic parameters of route vehicles in the conditions of the priority of urban public passenger transport and time indicators of the quality assessment of pas senger transport services. Method. The methodological basis for establishing a connection between traffic parameters in terms of the priority of urban public passenger transport and time indicators for evaluating the quality of transport service is a set of developed analytical models that describe the process of formation of passenger exchange at stopping points and time parameters of vehicle move ment. Results. On the basis of the functional connection for the selected structure of the research object, it was established that the implementation of the urban public passenger transport priority with the organization of traffic on special lanes and unhindered passage of regulated intersections plays a sig nificant role in improving the quality of passenger transport services. Originality. The assessment of the quality of transport service is based on establishing the level of compliance of each passenger's actual travel time with the previously planned. The use of travel time as a primary evaluation indicator is due to its leading role in the formation of quality criteria and the presence of influence on the param eters that determine the level of transport supply on the route. Practical meaning. The distribution of passengers at stops on route No. 24 «micro-district 602 – Akademika Pavlova subway st.» (Kharkiv, Ukraine) was obtained during modeling between the levels of perception of the quality of transport service showed that for everyday conditions, 8.9% and 27.8% of passengers (36.7% in total) receive a high-quality and suitable assessment, for traffic priority by sections – 32.3% and 64% (96.3% in total), when organizing priority passage at the intersection – 57.5% and 40.4% (97.9% in total). The obtained results indicate the expediency of implementing priority traffic from the standpoint of assessing the level of improvement in the quality of passenger service.
Assessment of increased energy efficiency of vehicles with a rational reduction of engine capacity
(Харківський національний автомобільно-дорожній університет, 2022) Podrigalo, Mikhail; Tarasov, Yurii; Kholodov, Mykhailo; Shein, Vitaly; Tkachenko, Olexander; Kasianenko, Oleksii; Подригало, Михайло Абович; Тарасов, Юрій Володимирович; Холодов, Михайло Павлович; Шеїн, Віталій Сергійович; Ткаченко, Олександр Сергійович; Касьяненко, Олексій Віталійович
Problem. The tendency to reduce Engine displacement, which has emerged in recent years in the global automotive industry, is due to the need to improve the environmental situation and energy efficiency of vehicles. Goal. The aim of the study is to increase the energy efficiency of vehicles by rationally reducing the maximum effective engine capacity. Methodology. In the paper authors used the method of partial accelerations implemented in a mobile registration and measurement complex, which allowed authors to obtain an improved formula for calculating aerodynamic drug. Experimental studies of car aerodynamics were also conducted. Results. In the study presents the results of the authors' research, which made it possible to prove the possibility of reducing the e internal combustion engine capacity while maintaining the specified maximum speed and the specified level of indicators of the car dynamic properties. Originality. The relationship between the use of maximum engine capacity and the relative change in the effective specific fuel consumption of a carburetor gasoline engine, with direct injection of gasoline and diesel were determined. Practical value. Calculations performed on the example of the ZAZ-1103 "Slavuta" car showed that a rational reduction in effective engine capacity allows to reduce fuel consumption by 9.5% for carburetor gasoline engine, and for an engine with direct injection of gasoline by 6.7 % and for diesel engines, by 20.3%.
ASSESSMENT OF VEHICLE EFFECTIVE MODERNIZATION TAKING INTO ACCOUNT THE LIFE CYCLE COST, TECHNICAL AND ENVIRONMENTAL PARAMETERS
(Харьковский национальный автомобильно-дорожный университет, 2016) Volodarets, M.; Володарець, М. В.; Володарец, Н. В.
The article deals with the features for determination of the efficiency of vehicle modernization compared to the base one. They propose the model for determining the efficiency of vehicle modernization compared with the base one. The model takes into account technical, economic and environmental parameters of the vehicle.
CHOICE OF OPMIMUM MATERIAL FOR STRENGTHENING THE ENTRANCE EDGES OF STEAM TURBINE ROTOR BLADES
(Харьковский национальный автомобильно-дорожный университет, 2016) Gluschcova, D.; Grinchenko, E.; Voronova, Ye.; Глушкова, Д. Б.; Гринченко, Е. Д.; Воронова, Е. М.; Глушкова, Д. Б.; Грінченко, О. Д.; Воронова, Є. М.
The influence of electrode material on the state of surfacing layer of steam turbine rotor blades is researched. The strengthened layer was produced by electro-spark alloying, using alloy T15K6 and steel 15X11МФШ. The microstructure, microhardness and thickness of surfacing layers were investigated. The advantages of steel 15X11МФШ for strengthening the entrance edges of steam turbine rotor blades which makes it possible to simultaneously harden both the entrance edges of rotor blades as well as increase their erosive resistance are grounded.
Clutch operating device with friction lining wear compensation analysis of properties and utilization efficiency
(Харьковский национальный автомобильно-дорожный университет, 2018) Riabukha, Iu. A.; Mikhalevich, N. G.; Voronova, E. M.; Yarita, A. A.; Klimenko, V. I.; Kolbasov, A. N.; Рябуха, Ю. О.; Михалевич, М. Г.; Воронова, Є. М.; Ярита, О. О.; Клименко, В. І.; Колбасов, О. М.; Рябуха, Ю. А.; Михалевич, Н. Г.; Воронова, Е. М.; Ярита, А. А.; Клименко, В. И.; Колбасов, А. Н.
In modern conditions of competition a lot of attention is paid to the comfort of driving. Control to driveline units is no exception. Application of clutch with the system of compensation of wear of friction overlays can not only enhance comfort, due to maintaining a stable effort on the pe-dal, but also improve the performance of the clutch. In the article a comparative analysis of the traditional design of the pneumohydraulic booster (PHB) and the design, which has a mecha-nism for compensating the wear of friction plate of clutches. As a compensator for the wear of friction plate of clutches, a telescopic rod with a closed cavity is used, which is filled the brake fluid through a reverse valve. With the wear of friction clutches, the fluid has the ability to slowly flow out of the closed cavity of the rod due to the leakage of the reverse valve. A positive feature is the ability to implement the proposed design within the framework of the traditional design of the pneumatic booster without changing the basic parts. As a result of the application of the proposed designs, it is expected to obtain such positive qualities as reducing the mass and mate-rial capacity of the product, maintaining high clutch performance regardless of the degree of wear of friction plates, reducing air consumption in operation (and, consequently, reducing fuel consumption), reducing the overall dimensions of the PHB. In order to confirm the new quali-ties, the consumption of air and fuel during the operation of both design of PHB on the typical urban route in the route bus is calculated. When calculating, the clutch exclusions taken into account are required during acceleration after each stop and traffic light. A reference to the investigation of the speed of the clutch control mechanism with new and worn friction plate of clutch is given. The properties of the proposed PHB design with the mechanism of compensation of the wear of the friction plate of the clutch are analyzed and the effect is shown not only in the manufacture of this design, but also from the application of this design in operation, which is expressed in fuel economy.
COMMUNICATIVE FOREIGN LANGUAGE TEACHING OF FUTURE ENGINEERS
(Харьковский национальный автомобильно-дорожный университет, 2017) Chevychelova, O.; Чевичелова, О. О.; Чевычелова, Е. А.
The essence of communicative approach to foreign language teaching has been defined; the conditions for developing communicative competence of future engineers at higher school have been described. The importance of stimulating the cognitive interest has been grounded and the ways of creating communicative situations at foreign language classes at higher technical school have been considered.
Comparative analysis of methods for determination of supply flows
(Харківський національний автомобільно-дорожній університет, 2021) Semchenko, N. О.; Kholodova, O. О.; Buhaiova, M. О.; Семченко, Н. О.; Холодова, О. О.; Бугайова, М. О.
Problem. The capacity of signalized intersections is determined using the concept of "saturation flow". It is the main characteristic in the process of their analysis, design and calculation. The work is devoted to solving the scientific-applied problem of increasing the efficiency of the signalized intersection at one level by choosing a rational method of determining saturation flows for these characteristics of traffic flows, geometric parameters of the intersection and infrastructure in its area. The subject of the study is the influence of the main characteristics of the traffic flow, parameters and infrastructure of the intersection on the saturation flow value. Goal. The aim of the work is the analysis of the influence of the main characteristics of the traffic flow, parameters and infrastructure of the intersection on the saturation flow value. Methodology. The calculation of the control regime at the intersection is based on determining the relation between the traffic intensity of vehicles at the intersection and the saturation flow value, which changes under the influence of a number of factors. Analytical calculation of the saturation flow value is based on using of correction factors that take into account the influence of these factors. Results. The methods of determination of saturation flows are analyzed out in the work; performed a comparative analysis of the definition of ideal saturation flows by different methods; a comparative analysis of the determination of the saturation flow correction coefficients for the parameters that have an effect on it were performed; the estimation of discrepancy at calculations of coefficients of correction of saturation flows by various methods is done; the list of coefficients which need to be considered at definition of their influence on a saturation flow is refined. Originality. In oppose to classical and other approaches to determining the saturation flow, the method recommended by the American "Highway Capacity Manual" takes into account more parameters of influence. It is proposed to use this method for the saturation flow calculation, but with an updated list of coefficients that must be taken into account in the calculations. Practical value. The results of the work can be used in the practice of improving the efficiency of signalized intersections in sections of the urban road network, as well as in further research on this topic.

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