Journal of Mechanical Engineering and Transport最新文献

{"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":"81 10","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139779434","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":"Resource assessment of friction surfaces of the brake disc mechanisms by relative wear indicators for cars","authors":"Oleksandr Nazarov, S. Krivoshapov, Mykolа Sergienko, V. Kashkanov, Vitalii Semchenko, Volodymyr Kulai","doi":"10.31649/2413-4503-2023-18-2-120-126","DOIUrl":"https://doi.org/10.31649/2413-4503-2023-18-2-120-126","url":null,"abstract":"Modern development of vehicle designs requires paying great attention to braking properties, which will depend on the design parameters of the brake mechanisms. The article discusses a scheme where a disc brake is installed on the front wheels, and drum brakes are installed on the rear wheels. From the diagram of the distribution of forces that act on the vehicle during braking, the maximum friction forces for the front and rear axles were determined. A general formula was obtained for the braking distance of a vehicle, during which wear of the brake mechanism occurs. We used the results of the well-known theory of friction and wear by I.V. Kragelsky. The mathematical wear model was built for each friction pair. The wear model takes into account the design parameters of the vehicle, the wear resistance coefficient of materials, the initial braking speed of the vehicle, the mileage and braking distance. The main design parameters of the brake system are the friction radius, the kinematic rolling radius of the wheel, and the amount of drive pressure. \u0000To assess the service life of the brake mechanism, it was proposed to use such an indicator as the relative wear of associated parts. A formula has been obtained for calculating this indicator based on changes in geometric parameters and operating modes of the brake mechanism under operating conditions. A forecast was made of the service life of the brake mechanisms of the front and rear axles of passenger cars, which is proposed to be carried out according to the indicator of relative wear of friction surfaces. Graphic dependences of the distribution of relative wear of the friction surfaces of brake mechanisms for Chevrolet Aveo and Forza cars were constructed. It was shown using the example of Chevrolet Aveo passenger cars that the relative wear of the front axle brakes is maximum and it varies from 22.5 to 26.1%, and for the rear axle this figure varies from 21.0 to 22.5%. The service life of the brake disc is 4.44 times greater than the service life of the friction lining for the Chevrolet Aveo. For the Forza car this figure is 4.76. The results of the work can be used to estimate the residual life of brake mechanisms, taking into account operating conditions.","PeriodicalId":157730,"journal":{"name":"Journal of Mechanical Engineering and Transport","volume":"48 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139779534","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":"93 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139776900","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":"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":"8 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139778628","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":"Optimization passenger transport on basic organizations of uniform suburban passenger flow","authors":"Nataliia Chernetskaya-Beletskaya, Ihor Baranov, M. Miroshnykova, Svitlana Berezhna","doi":"10.31649/2413-4503-2023-18-2-183-189","DOIUrl":"https://doi.org/10.31649/2413-4503-2023-18-2-183-189","url":null,"abstract":"The purpose article is improveefficiency of suburban passenger transportation based on organization of suburban passenger traffic. It was established that suburban passenger flow urban agglomerations consistsof following aggregated groups (segments): workers with variable work schedules, office workers, students, other passengers, while the total volume of passenger flow and the value individual components its segments are unstable and characterized by spatial and temporal unevenness. \u0000The task organization of passenger traffic is find a compromise between the needs passengers and possibilities of transport. The compromise is achieved due fact by obtaining formal optimum each time, with help of variable weighting factors, it is possible display priorities passenger flows from different stations and sections. The task optimizing functioning of passenger transport system ofurban agglomeration based on organization passenger flow is minimize total costs transportation and waiting. The optimization criterion is determined based on minimization costs mastering passenger flow in full, as well as waiting by passengers at departure station and delay at destination station. \u0000The article formulates problem of organizing suburban passenger flows in urban agglomerations reduce static reserves of suburban passenger complex at expense dynamic ones. The optimization apparatus based on dynamic transport problem was chosen and substantiated. The possibilities using method of dynamic coordination solve transport problems of urban agglomerations are analyzed and advantages are shown. The technology using optimization apparatus is proposed, which includes directed iterative process, which allows reduce the number of experiments for choosing among optimal options, most client-oriented compromise option. The method optimal organization of homogeneous suburban passenger flow based on method dynamic coordination has been developed. It was established use directed iterative process allows significantly reduce number of experiments in order achieve consensus betweeninterests passengers and efficiency of transport system.","PeriodicalId":157730,"journal":{"name":"Journal of Mechanical Engineering and Transport","volume":"118 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139836498","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":"Automation of the construction, comparison and selection of delivery routes and schemes in the multimodal transportation system","authors":"O. Kichkina, O. Kichkin","doi":"10.31649/2413-4503-2023-18-2-73-79","DOIUrl":"https://doi.org/10.31649/2413-4503-2023-18-2-73-79","url":null,"abstract":"  \u0000The article proposes the application of a methodical approach to choosing the optimal route of multimodal transportation based on a module integrated into the information system of a freight forwarding company. The functions of the module are to build an optimal delivery scheme and meet all customer requirements, both domestic and international multimodal transportation, taking into account the changing circumstances in the conditions of instability caused by the state of war and the need to reorient the usual delivery routes. \u0000In the conditions of military operations, this method of automated search and comparison of alternative routes allows taking into account changing conditions that develop in real time, while the cargo flow should be accompanied by an information flow that would also be available in real time. The proposed structure of the database, the structures of requests for development routes., developed forms of source documents. The criteria for comparing routes of different dimensions are defined: the difference in the distance of cargo transportation, the costs of changing the existing system of cargo transportation, increasing the level of transportation safety, delivery time, reducing the cost of delivering a batch of goods, the difference in delivery time. A solution to the multi-criteria decision-making problem by normalizing the criteria and the additive optimization method is proposed. The method of determining the best route and supply scheme is implemented in the \"decision-making\" module, which is integrated into the information system of the transport forwarding company. \u0000The result of the practical implementation of the proposed method of construction, comparison and selection of routes and delivery schemes in the system of multimodal transportation based on the integrated module in the information system of the transport and forwarding company is the possibility of quick response to changes in external circumstances, warnings of emergency and conflict situations, control of the transportation process along the entire route and , if necessary, making adjustments to the route and delivery scheme, choosing a safe and effective option by the operator of multimodal transportation.","PeriodicalId":157730,"journal":{"name":"Journal of Mechanical Engineering and Transport","volume":"76 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139836632","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":"8 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139838337","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 mechanism of lapping with a free abrasive by using a silicate composition","authors":"V. Makarov, Tamara Makarova, Мykola Vynogradov, Sergey Mastepan, Dmytro Savenok, Oleksandr Levadnyi","doi":"10.31649/2413-4503-2023-18-2-94-100","DOIUrl":"https://doi.org/10.31649/2413-4503-2023-18-2-94-100","url":null,"abstract":"The results of an experimental study are presented that explain and confirm the mechanism of lapping friction surfaces with a silicate abrasive composition. \u0000It is shown that the stability of the silicate lapping paste over time can be achieved by introducing ferric trichloride (FeCl3), which in this case is a thickener of liquid glass and also has high hygroscopic properties. The adhesive properties of the silicate paste are improved by the addition of lubricant 1-13. This grease was chosen due to its water solubility. To increase the abrasive ability of the silicate paste, an abrasive powder was introduced. \u0000It was found that the lapping performance of the silicate composition and the quality of surfaces are higher than when treated with the «KT» paste, which is currently used for lapping automobile engine valves. Based on the results of the study, the mechanism of lapping friction surfaces with a silicate paste is presented. The mutual movement of the surfaces results in cutting and scratching of the highest peaks of the bumps by the abrasive grains. When silicon oxide (SiO2) is added to the abrasive material, its particles are coated with silicon oxide. This is because liquid glass solutions have a high adhesive force and low surface tension. At the points of contact between the abrasive particles, the temperature rises, and since there is SiO2 around the abrasive, when the latter enters the contact zone, amorphous silica (SiO2) is formed. Since the abrasive grains are coated with a silicon oxide film, SiO2 penetrates into the cavities of micro-irregularities and adheres to the surface under repeated exposure to the abrasive. Thus, the surface to be treated is saturated with silicon oxide, which leads to an increase in its quality after grinding with a silicate composition. \u0000It has been proven that high surface quality is formed by amorphous silica. To confirm this mechanism, chemical and X-ray spectral analyses of the samples were performed, which showed the presence of SiO2 on the treated surface and a \"strong bond\" of silicon compounds with the metal surface layer. \u0000It was found that the high quality of the surface is also due to the shape of abrasive particles and wear products. It has been confirmed that with the variable movement of surfaces relative to each other, abrasive grains take on a new position each time. At the same time, they are worn from all sides and acquire a rounded shape, and are simultaneously enveloped by a SiO2 foil.","PeriodicalId":157730,"journal":{"name":"Journal of Mechanical Engineering and Transport","volume":"374 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139839365","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 mechanism of lapping with a free abrasive by using a silicate composition","authors":"V. Makarov, Tamara Makarova, Мykola Vynogradov, Sergey Mastepan, Dmytro Savenok, Oleksandr Levadnyi","doi":"10.31649/2413-4503-2023-18-2-94-100","DOIUrl":"https://doi.org/10.31649/2413-4503-2023-18-2-94-100","url":null,"abstract":"The results of an experimental study are presented that explain and confirm the mechanism of lapping friction surfaces with a silicate abrasive composition. \u0000It is shown that the stability of the silicate lapping paste over time can be achieved by introducing ferric trichloride (FeCl3), which in this case is a thickener of liquid glass and also has high hygroscopic properties. The adhesive properties of the silicate paste are improved by the addition of lubricant 1-13. This grease was chosen due to its water solubility. To increase the abrasive ability of the silicate paste, an abrasive powder was introduced. \u0000It was found that the lapping performance of the silicate composition and the quality of surfaces are higher than when treated with the «KT» paste, which is currently used for lapping automobile engine valves. Based on the results of the study, the mechanism of lapping friction surfaces with a silicate paste is presented. The mutual movement of the surfaces results in cutting and scratching of the highest peaks of the bumps by the abrasive grains. When silicon oxide (SiO2) is added to the abrasive material, its particles are coated with silicon oxide. This is because liquid glass solutions have a high adhesive force and low surface tension. At the points of contact between the abrasive particles, the temperature rises, and since there is SiO2 around the abrasive, when the latter enters the contact zone, amorphous silica (SiO2) is formed. Since the abrasive grains are coated with a silicon oxide film, SiO2 penetrates into the cavities of micro-irregularities and adheres to the surface under repeated exposure to the abrasive. Thus, the surface to be treated is saturated with silicon oxide, which leads to an increase in its quality after grinding with a silicate composition. \u0000It has been proven that high surface quality is formed by amorphous silica. To confirm this mechanism, chemical and X-ray spectral analyses of the samples were performed, which showed the presence of SiO2 on the treated surface and a \"strong bond\" of silicon compounds with the metal surface layer. \u0000It was found that the high quality of the surface is also due to the shape of abrasive particles and wear products. It has been confirmed that with the variable movement of surfaces relative to each other, abrasive grains take on a new position each time. At the same time, they are worn from all sides and acquire a rounded shape, and are simultaneously enveloped by a SiO2 foil.","PeriodicalId":157730,"journal":{"name":"Journal of Mechanical Engineering and Transport","volume":"43 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139779490","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":"Increasing the repairability of vehicles with rational quantity of tools","authors":"V. Bilichenko, O. Polyanskyi, Yevhen Dubinin, A. Molodan","doi":"10.31649/2413-4503-2022-16-2-9-15","DOIUrl":"https://doi.org/10.31649/2413-4503-2022-16-2-9-15","url":null,"abstract":"The conducted systematic analysis of maintainability indicators allows establishing their connection with other reliability properties and classifying these indicators according to technical and economic criteria. On this basis, the technological component of maintenance and repair, which ensures the provision of spare parts, tools and means of technical condition control, was selected and investigated. Set of indicators that allow to evaluate and standardize the maintainability of means of transport most fully and in accordance with modern requirements is proposed.The dependence was obtained for determining the required number of tools in a set of spare parts, tools and accessories (STA), which takes into account the reliable characteristics of the machine and the characteristics of the process of restoring its operability under real operating conditions.The approach to calculations of rational sets of tool equipment for vehicle machinery is proposed on the example of the chassis of the domestic wheeled tractor KhTZ-17221, the corresponding calculations are performed. The conducted analysis shows that with the existing service system and the level of reliability of the KhTZ-17221 tractors in real operation conditions to ensure the readiness factor within 0.85-0.95, the presence of tools in the equipment kit has a significant impact.The analysis of the obtained dependence shows that in order to quickly eliminate the consequences of the failures of the KhTZ-17221 tractors, it is necessary to have a complete set of tools in the set of STA, provided for in the operating instructions. Otherwise, the operative time for eliminating failures increases, which leads to unjustified downtime of equipment and increased costs for consumers, especially during periods of agricultural work. When increasing the number of tools in the kit of STA to the level regulated by the factory documentation, while maintaining all other parameters, it is possible to increase the readiness factor in real operation from 0.84 to 0.92. That is, the presence of tools significantly increases the efficiency of vehicles using in real operation conditions.The obtained results can be used to improve maintainability indicators","PeriodicalId":157730,"journal":{"name":"Journal of Mechanical Engineering and Transport","volume":"129 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114417769","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}