Journal of Mechanical Engineering and Transport最新文献

{"title":"Experimental studies of microclimate parameters in the bus passenger compartment in the cold season","authors":"Yurii Voichyshyn, Orest Horbay, Yurii V. Hay, K. Holenko, Oleksandr U. Rudyk, Andriy P. Polyakov","doi":"10.31649/2413-4503-2023-18-2-38-45","DOIUrl":"https://doi.org/10.31649/2413-4503-2023-18-2-38-45","url":null,"abstract":"The paper analyzes the current state of research on microclimate parameters in bus cabins and identifies the main issues of the given topic. The authors analyzed and explained the importance of ensuring a favorable microclimate in vehicle cabins and assessed the risks of non-compliance. The relevance of the topic is confirmed by the existing scientific publications of foreign scientists who worked in this field and investigated similar issues. In addition to scientific works, an analysis of regulatory documentation in the world and Ukraine was conducted, existing problems and conflicts in requirements and parameters were considered. Theoretical knowledge is supplemented by experimental studies - the technical characteristics of the investigated bus are shown and the essence of the experiment is presented. Experimental studies were carried out in the passenger compartment of the Ukrainian-made Electron A18501 bus. Microclimate parameters such as temperature, humidity, and the amount of air throughout the passenger compartment in the cold season were measured using special equipment. Measurements were taken in the front, middle and rear of the bus cabin. A total of 4 conditional measurement zones were defined: zone 1 (between the wall of the driver's cabin and the passengers’ platform), zone 2 (in the area of the passengers’ platform), zone 3 (between the passengers’ platform and the rear door) and zone 4 (in the area of the rear door and the engine compartment), where the temperature and air humidity were determined at specific points. Measurements of the amount of air coming from the heating equipment (diffusers) were also made in certain locations. Analyzing the regulatory documents, in particular those used in our country, it was established that air temperature and humidity should be measured at the level of the feet and heads of passengers. There is no need to take measurements at waist level in vehicle cabins, unlike the driver's cabin, unless the bus is operated in very cold or very hot conditions. Since the climate in Ukraine is moderate, there is no need to carry out such additional measurements. The bus traveled along the route Ryasne 1-Levandivka-Sknyliv in Lviv during the experiment. This route fully corresponds to the city bus driving cycle, and its length is comparable to the value of the average city bus route. As a result of the experiment, it was determined that there are specific points in the cabin where the parameters of the microclimate do not correspond to the normative ones. These identified shortcomings require further research in order to improve the comfort of the microclimatic conditions in the bus cabin.","PeriodicalId":157730,"journal":{"name":"Journal of Mechanical Engineering and Transport","volume":"14 7","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139838471","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Modular loading units and modular cargo transport complexes for intermodal transportation liquid cargo","authors":"Volodymyr Petrukhin","doi":"10.31649/2413-4503-2023-18-2-141-147","DOIUrl":"https://doi.org/10.31649/2413-4503-2023-18-2-141-147","url":null,"abstract":"The purpose of the article is to analyze the problems of liquid cargo transportation between Ukraine and the EU countries, due to the non-interoperability of their railway transport systems. The analysis of existing solutions in the intermodal way of transporting liquid cargo was carried out. Their shortcomings are pointed out and their solution proposed by introducing a modular tank container MVO 480.00.110-02 for intermodal transportation of fuels and lubricants (F&L), liquefied petroleum gases (LPG), oil and other liquid cargoes by rail transport of 1435/1520 mm gauges. In the conditions of the ongoing war, there was an acute problem of ensuring the transportation of F&L from EU countries to Ukraine. It was complicated by the different width of the railway track. This required the replacement of tank car bogies at the joints of the 1435/1520 mm railway tracks. In addition, private tank cars had dimensions that are allowed for transportation only on railways with a gauge of 1520 mm. They exceeded the dimensions allowed for transportation on tracks of 1435 mm. This did not allow them to be used for transporting liquid cargo from EU countries. Usually, ISO 1496-3 tank containers with a length of 20 feet are used for intermodal transportation of liquid cargoes by sea, rail and road transport. In connection with the universal purpose and the need for stacking during sea transportation, their dimensions are made much smaller than the dimensions allowed for transportation by rail. Tank containers in the form of removable bodies – Swap Body tank containers are used for intermodal transportation of liquid cargo only by road and rail transport. The article points out the shortcomings of existing cargo units. To eliminate them, our company developed and patented tank containers – modular loading units (MLU) 480.00.110-02. \u0000For intermodal transportation of liquid cargo by rail transport of gauge 1435/1520 mm. MLU 480.00.110-02 are made in the form of modular connector complexes, which are assembled from container and cargo modules. The unified platform container model 480.00.010 of the ISO 668 standard, series 1, size and type code 29Р0 is used as a container module. Cargo modules can be mounted on the container module – removable tanks of various specializations for the transportation of various liquid cargoes. This execution of modular loading units made it possible to expand their specialization and increase the volume of tanks by 40 ÷ 45% in comparison with existing cargo units, with the possibility of transportation in the dimensions of the load of tracks of 1435/1520 mm. A comparison of the cost of transportation of liquid cargoes by tank cars, tank trucks and tank containers is given. MLU 480.00.110-02. The technical conditions of NTU 480.00.110-02 on transportation by fitting platforms of tracks of 1435/1520 mm were developed and agreed with the railway administrations of Ukraine and EU countries. An example of the implementation of a modular carg","PeriodicalId":157730,"journal":{"name":"Journal of Mechanical Engineering and Transport","volume":"20 10","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139777169","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Influence of the geometric parameters of the vehicle on its aerodynamic characteristics","authors":"Dmytro B. Begerskyi, Ivan V. Vityk, Andriy O. Koval, Serhii V. Tsymbal","doi":"10.31649/2413-4503-2023-18-2-10-15","DOIUrl":"https://doi.org/10.31649/2413-4503-2023-18-2-10-15","url":null,"abstract":"In the article, the authors analyzed the relevance of the research topic, defined the goal, task, subject and object of the research. They also provided an analysis of well-known studies related to the study of the peculiarities of the formation of air resistance during the movement of motor vehicles. On the basis of the analysis of known studies on the factors affecting the geometric parameters of road trains on aerodynamic resistance, the relevance of the studies is substantiated, and their purpose and tasks are formulated.The purpose of the article is to determine the influence of geometric parameters of road trains on their aerodynamic characteristics and, as a result, on fuel consumption, and therefore on the cost of transport work. The tool for researching this issue is software, which will be used to conduct a number of experiments. Every year, road trains move millions of kilometers of various goods, and on such a scale, the price of each individual kilometer plays a very important role. Based on the analysis of the power balance equation, it can be concluded that a significant part of the engine power is spent on overcoming air resistance, and the higher the speed of the road train, the greater this resistance.The relevance of research lies in the possibility of reducing costs through the adoption of a number of decisions to reduce the aerodynamic resistance of road trains.The mechanism of air resistance is considered. It has been found that reducing aerodynamic drag is a very important task, as every 2% reduction in vehicle drag results in a 1% improvement in fuel economy. Compared to passenger cars, trucks have a much larger cross-section and more clumsy outlines. This is caused by the specifics of their purpose and use. When creating a universal truck, they try to get as much volume as possible to accommodate cargo with the minimum area occupied by the car on the road, and since part of this area is the engine and cabin, it is natural that the body is high. So, if one of the ways to reduce the aerodynamic resistance of a passenger car is to reduce its cross-section, first of all, its height, then another option should be found for a highway truck or road train.","PeriodicalId":157730,"journal":{"name":"Journal of Mechanical Engineering and Transport","volume":"26 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139778639","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Improving the dynamic properties of the vehicle by installing diesel engines during modernization","authors":"V. Bilichenko, Dmytro M. Matvijchuk","doi":"10.31649/2413-4503-2023-18-2-16-24","DOIUrl":"https://doi.org/10.31649/2413-4503-2023-18-2-16-24","url":null,"abstract":"This article examines the possibilities of improving the dynamic properties of a weapon vehicle by installing diesel engines during modernization. It proposes a number of practical measures to achieve this goal, such as replacing a gasoline engine with a diesel engine.The article conducts a comparative analysis of the traction and dynamic characteristics of the basic gasoline power unit and the diesel power unit installed after modernization on the example of APCS 70. The necessity of modernization by replacing gasoline engines with diesel units is substantiated by means of a comparative traction and dynamic calculation and economic indicators of power units. A comparative analysis of fuel consumption is carried out and the power of the power units is compared. The disadvantages of using gasoline power units are analyzed. According to the results of the calculations, the optimal ratio of parameters that determine the dynamic properties of the vehicle of the weapon is achieved.For the calculation of the main indicators of traction and speed properties of the prototype, the numerical values of the design parameters of the APCS 70 product, which are given in the reference literature, are used.The modernization discussed in this article involves further refinement of the APCS 70's power plant compartment, which is located in the aft part of the hull. It contains two ZMZ 4905 power units assembled with clutches and gearboxes mounted on a common frame. The gasoline power units are replaced with clutch assemblies and 4-speed transmissions. Diesel power units are assembled with clutches, equipped with 5-speed gearboxes and are installed with minor modifications to the standard subframe on which the units are mounted. In turn, the replacement of the power units entails further modifications to the cooling system, fuel supply, exhaust system, engine heating system, as well as part of the electrical equipment of the power units. The transfer case and subsequent transmission of the product remain unchanged.The research provides valuable information for military equipment specialists and engineers interested in improving the performance of combat vehicles.","PeriodicalId":157730,"journal":{"name":"Journal of Mechanical Engineering and Transport","volume":"63 12","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139779229","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Research on testing methods for the corrosion resistance of paint coatings","authors":"V. Pavlenko, Volodymyr Manuylov, V. Kuzhel, Serhii Semenchenko, Vitalii Hapula","doi":"10.31649/2413-4503-2023-18-2-127-133","DOIUrl":"https://doi.org/10.31649/2413-4503-2023-18-2-127-133","url":null,"abstract":"This scientific work is aimed at researching the testing methods of paint coatings used for protecting the metal parts of automobiles in order to determine their resistance to corrosion processes. Paint coatings are used to protect the metal surfaces of automobiles from corrosion in various climatic conditions and under the influence of aggressive factors such as atmospheric conditions, chemical substances on the road, polluted air, and other corrosive environments, making their quality and effectiveness of great significance. \u0000Different methods of testing paint and varnish coatings are considered, such as neutral salt spray test, acetic acid salt spray test (with and without copper acceleration), and cyclic corrosion testing. Attention is also given to parameters such as test duration, temperature regimes, and chemical aggressiveness of the environment to establish the effectiveness of these methods. The analysis of the tests allows determining which methods best meet the requirements for assessing the corrosion resistance of paint coatings. The work also investigates the impact of various factors, such as the type of paint coating, surface preparation, and operating conditions, on the test results. It was determined that the proper selection of test methods and adequate assessment of their effectiveness help in improving the corrosion resistance of the paint coating in various operating conditions. \u0000The work has important practical applications in the automotive industry by enhancing the quality of protection for automotive coatings against corrosion and extending their service life in various operating conditions. The obtained results will help improve the quality and durability of paint coatings, metal structures, and other products against corrosion by choosing the optimal method for testing paint coatings. This scientific work has practical significance for engineers and manufacturers involved in the development and application of corrosion-resistant coatings.","PeriodicalId":157730,"journal":{"name":"Journal of Mechanical Engineering and Transport","volume":"468 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139839067","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Methodology of researching and forecasting the production potential of a motor transport enterprise","authors":"Uliana Plekan, O. Lyashuk, N. Rozhko, Oleg Tson, Yurii Buriennikov","doi":"10.31649/2413-4503-2023-18-2-148-154","DOIUrl":"https://doi.org/10.31649/2413-4503-2023-18-2-148-154","url":null,"abstract":"Essence and importance of diagnostics of condition of a motor vehicle enterprise were discussed in the article. The existing potential that a company should use to choose its own strategic development was analyzed. \u0000It was outlined that organizational and economic mechanism of stable development of a motor vehicle enterprise is based on system of assessing stability of a enterprise in a conditions of an unstable external environment of operation. The basic components of sustainability of a motor vehicle enterprise were identified and analyzed, in particular: the safety of operations, the presence of competitive advantages and the quality of the provision of transport services. Analysis of impact of macroenvironmental factors on the operation of the selected transport enterprise was carried out. At the same time, the manifestations of the influence of specific factors and the nature of the influence of the factors were indicated. Evaluation of the degree of influence of factors on the selected enterprise is carried out by experts on a rating scale.It was determined that political, scientific and technical factors have the greatest positive influence on the enterprise. Economic, legal and natural factors exert the most negative influence. \u0000The article stated that competitiveness of a motor vehicle enterprise is a decisive factor determining a stability of enterprise's functioning.Directions of the system for ensuring high competitiveness of a transport enterprise were proposed. The key aspects of ensuring a sustainable development of an enterprise, on the basis of which it is possible to evaluate a competitiveness of an enterprise using the grapho-analytical method, were proposed. A graph-analytical model of the potential of the selected enterprise was built with a reflection of resource, investment, marketing, organizational, innovation and production potentials. The conclusion about incomplete use of all types of potential was made on the basis of the carried out assessment of potential of a motor transport enterprise. Unused potential is a reserve for increasing the company's competitiveness in future periods. The «hexagon of potential» of the selected enterprise was characterized by correct form and balanced management.","PeriodicalId":157730,"journal":{"name":"Journal of Mechanical Engineering and Transport","volume":"156 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139839394","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Analysis of existing methods and approaches to the search of damaged armored tank vehicles during technical intelligence in the modern armies of the world","authors":"Y. Pavlov, Andriy Kashkanov","doi":"10.31649/2413-4503-2023-18-2-134-140","DOIUrl":"https://doi.org/10.31649/2413-4503-2023-18-2-134-140","url":null,"abstract":"The article proposes the definition of directions and opportunities for the use of technical means of information in the performance of the tasks of rear support of troops in armed conflicts that are taking place today. \u0000Possible areas of application of unmanned aerial vehicles in the technical intelligence system of the National Guard of Ukraine and the Armed Forces of Ukraine are considered. The analysis of various types of unmanned aerial vehicles revealed the peculiarities of their use. The foreign experience of the use and development of unmanned technologies in the field of search and evacuation of damaged armored vehicles was analyzed. Conclusions were obtained regarding the combination of unmanned aerial vehicles with traditional means of technical intelligence, which showed their significant advantages. Prospective areas of application of aircraft in combination with technical intelligence systems of individual units of the National Guard of Ukraine and military units of the Armed Forces of Ukraine during operations and hostilities have been identified. The possibility of combining aviation technologies and means of technical intelligence in armed conflicts of modern armies of the world is also considered. \u0000Technical intelligence was analyzed from the point of view of the type of intelligence by tasks, forces, means and methods; and also as an organization of intelligence activities based on the use of technical means. The dependence on the nature of signals detected by technical means is shown, one of the types of technical intelligence is photo and infrared intelligence based on the interception of light waves (species intelligence). \u0000Species intelligence is considered as the collection of intelligence information based on the analysis of a large number of images obtained with the help of photographic, optical-electronic and radar equipment. According to its specificity, intelligence belongs to technical intelligence and includes air and space intelligence. Species reconnaissance uses photographic images taken in the visible range of the electromagnetic spectrum, infrared photography and multispectral photography. Radar images for species reconnaissance are created by equipment of various electromagnetic ranges synthesized in radar equipment. Spectral reconnaissance should be distinguished from electronic reconnaissance using optical-electronic or radar equipment that does not form an image. \u0000Military experts of developed countries believe that in the modern combat environment, unmanned aerial vehicles (UAVs) for conducting reconnaissance as a means of technical intelligence can more effectively and quickly solve the tasks of technical intelligence. At the same time, the time required to deliver the received intelligence information to the relevant management bodies is reduced.","PeriodicalId":157730,"journal":{"name":"Journal of Mechanical Engineering and Transport","volume":"31 12","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139776941","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Possibilities of improving the safety of rail vehicles with independently rotating wheels","authors":"Yevhen Myhajlov, Stanislav Semenov, Yan Dizho, Miroslav Blatnitsky","doi":"10.31649/2413-4503-2023-18-2-110-119","DOIUrl":"https://doi.org/10.31649/2413-4503-2023-18-2-110-119","url":null,"abstract":"One of the promising ways to achieve high speed and smooth running of rail vehicles during stable movement in straight sections of the track and to improve the characteristics of fitting the vehicles in a curve is the use of independently rotating wheels in their running parts. Such undercarriages are already becoming quite widespread, for example, in urban rail transport vehicles. But independently rotating wheels can rotate in a wheel pair around a common axis with different angular velocities. It follows that during their movement, longitudinal creep forces do not arise, which form the controlling moment and center the wheel pair in the rail track. This can lead to increased angles of attack of the wheels on the rails, increased lateral forces and accelerated wear of the wheels and rails.  In turn, this increases the tendency of vehicles with independently rotating wheels to derail by rolling the flange onto the head of the rail. \u0000The accumulated global experience of operating similar vehicles confirms this. To overcome the mentioned disadvantages of independently rotating wheels, a number of various technical solutions have been proposed. Some of them relate to ensuring the given elastic-dissipative characteristic of the torsional articulation of the wheels in a wheel pair. A promising direction is the improvement of the characteristics of the connections of wheel pairs with the bogye and bogyes with the vehicle body, the use of mechatronic systems for controlling the position of the wheel pairs in the horizontal plane for their radial installation in curved sections of the track. In this work, attention is paid to the issue of the use in the design of independently rotating wheels of a perspective design scheme that allows independent rotation of the wheel's support surface and its guide surface (flange). The question of the effect of changing the design scheme of the wheel on the safety of movement due to the roll-in of the ridge on the rail head was considered. \u0000The influence of a promising design scheme of a wheel in comparison with a traditional design scheme of a wheel on the safety of driving down a rails was investigated. The peculiarities of the distribution of frictional forces in the ridge contact during movement along the rails of the wheels of both design schemes are analyzed. For a wheel of a traditional design scheme, the module and the direction of the friction force vector in the ridge contact are uniquely determined by the geometric characteristics of the contact between the wheel and the rail and the angular speed of the wheel rotation. At the same time, when the wheel of the prospective design scheme moves, the direction and module of the friction force vector of the ridge on the rail also depend on the ratio of the angular velocities of rotation of the supporting surface of the wheel and its guiding surface (flange) around the common axis. The obtained results allow us to draw a conclusion about the expediency of using a ","PeriodicalId":157730,"journal":{"name":"Journal of Mechanical Engineering and Transport","volume":"68 46","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139778658","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Methodology of researching and forecasting the production potential of a motor transport enterprise","authors":"Uliana Plekan, O. Lyashuk, N. Rozhko, Oleg Tson, Yurii Buriennikov","doi":"10.31649/2413-4503-2023-18-2-148-154","DOIUrl":"https://doi.org/10.31649/2413-4503-2023-18-2-148-154","url":null,"abstract":"Essence and importance of diagnostics of condition of a motor vehicle enterprise were discussed in the article. The existing potential that a company should use to choose its own strategic development was analyzed. \u0000It was outlined that organizational and economic mechanism of stable development of a motor vehicle enterprise is based on system of assessing stability of a enterprise in a conditions of an unstable external environment of operation. The basic components of sustainability of a motor vehicle enterprise were identified and analyzed, in particular: the safety of operations, the presence of competitive advantages and the quality of the provision of transport services. Analysis of impact of macroenvironmental factors on the operation of the selected transport enterprise was carried out. At the same time, the manifestations of the influence of specific factors and the nature of the influence of the factors were indicated. Evaluation of the degree of influence of factors on the selected enterprise is carried out by experts on a rating scale.It was determined that political, scientific and technical factors have the greatest positive influence on the enterprise. Economic, legal and natural factors exert the most negative influence. \u0000The article stated that competitiveness of a motor vehicle enterprise is a decisive factor determining a stability of enterprise's functioning.Directions of the system for ensuring high competitiveness of a transport enterprise were proposed. The key aspects of ensuring a sustainable development of an enterprise, on the basis of which it is possible to evaluate a competitiveness of an enterprise using the grapho-analytical method, were proposed. A graph-analytical model of the potential of the selected enterprise was built with a reflection of resource, investment, marketing, organizational, innovation and production potentials. The conclusion about incomplete use of all types of potential was made on the basis of the carried out assessment of potential of a motor transport enterprise. Unused potential is a reserve for increasing the company's competitiveness in future periods. The «hexagon of potential» of the selected enterprise was characterized by correct form and balanced management.","PeriodicalId":157730,"journal":{"name":"Journal of Mechanical Engineering and Transport","volume":"25 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139779519","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Improvement of the method for determining the traction properties of the SKODA FABIA vehicle during bench diagnostics","authors":"Іhоr Мarmut, V. Kashkanov, Volodymyr Zuiev","doi":"10.31649/2413-4503-2023-18-2-101-109","DOIUrl":"https://doi.org/10.31649/2413-4503-2023-18-2-101-109","url":null,"abstract":"As you know, the main output parameters characterizing the state of the power unit are the power and torque values. These parameters determine the dynamic qualities of the car, and can also affect fuel consumption and the level of harmful emissions. \u0000The above parameters are checked using traction roller stands. Such stands allow you to reproduce real speed and load modes. Usually, the traction force on the drive wheels is measured on the stands. It is then easy to calculate the power at a given test speed. Traction force is determined, on the one hand, by the output torque of the engine, on the other hand, by mechanical losses in the transmission. In turn, the moment is determined by the perfection of the combustion process, the complete use of the energy of combustion products, and mechanical losses in the engine itself. \u0000When there is no reliable, experimentally obtained external speed characteristic of an internal combustion engine, Leiderman's formula is usually used for its approximate construction. \u0000This technique gives a satisfactory approximation of the dependence of power on revolutions. However, the moment curve is noticeably different from the experimental one. due to the fact that it uses only one experimental point - the maximum power and the corresponding revolutions. Therefore, a refined method of building the external speed characteristic using the example of the SKODA FABIA car is proposed using additional equations that specify the values of the empirical coefficients A, B, C. \u0000On the basis of the refined external speed characteristics of the engine, the revolutions of the crankshaft are converted into speed, and a graph of the permissible traction force against the speed is drawn according to the derived formula. Standards for diagnostic parameters of the power unit in acceleration mode under partial load are also defined. \u0000The proposed method of registering engine diagnostic parameters to determine their normative values provides an individual approach to diagnosing the technical condition of cars.","PeriodicalId":157730,"journal":{"name":"Journal of Mechanical Engineering and Transport","volume":"39 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139836427","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}