Випуск 52

Постійне посилання зібранняhttps://dspace.khadi.kharkov.ua/handle/123456789/16059

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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.
Michelin Uptis - Are airless tires the future of the automotive industry?
(Харківський національний автомобільно-дорожній університет, 2023) Nikolov, Nikola Oka; Siegfried, Patrick; Ніколов, Нікола Ока; Зігфрід, Патрік
Problem. The paper addresses the question of whether the conversion of the entire automotive industry to airless tires, specifically focusing on the Michelin Uptis concept, is economically realistic and technically feasible for high-performance vehicles. Goal. The goal of the paper is to investigate and analyze the technical feasibility and economic impacts of airless tires, specifically the Michelin Uptis, through expert interviews, literature review, and research methodology. Methodology. The research methodology involves various research methods, including expert interviews, literature research, journal articles, press releases, and expert opinions. The paper relies on current and relevant sources to provide a comprehensive understanding of the topic. Expert interviews with industry professionals, such as Philipp Kranich from Mercedes Benz Consulting and Jochen Konrad, a tire developer at Pirelli, provide additional insights. Results. The technical feasibility of airless tires, specifically the Michelin Uptis, is examined, highlighting advantages such as puncture protection and environmental friendliness. However, concerns are raised regarding the structure's resilience, potential damage to spokes, weight and energy efficiency, and suitability for high-performance vehicles. The economic impacts of airless tires are also discussed, including the potential reduction in tire orders, changes in aftermarket services, logistical adaptations, and the pricing challenges associated with the Uptis concept. Originality and Practical Value. This paper offers an analysis of the technical and economic aspects of airless tires, specifically focusing on the Michelin Uptis concept. It provides expert insights, reviews relevant literature, and addresses the original research question. The findings contribute to the understanding of the feasibility and potential implications of airless tires in the automotive industry, aiding decision makers in assessing the practical value and viability of adopting this tire technology.
Optimization of key gear parameters to reduce weight
(Харківський національний автомобільно-дорожній університет, 2023) Voropay, Alexey; Koriak, Olexandr; Bogdan, Dmytro; Neskreba, Eduard; Воропай, Олексій Валерійович; Коряк, Олександр Олексійович; Богдан, Дмитро Іванович; Нескреба, Едуард Євгенійович
Problem. The problems of designing, and especially improving, mechanical gears are of key importance in modern mechanical engineering and automotive transport. Gear transmissions are quite widespread relative to other mechanical transmissions because they have a number of crucial advantages. Gear transmissions are widely used in a variety of drives for vehicle components and assemblies, with modern development trends aimed at reducing their weight and size. As the size of the transmission decreases, the dimensions of other parts and assemblies also decrease, and, accordingly, their cost. Therefore, research related to the study of the interdependence of the main parameters of gears for the purpose of their further optimization does not lose its relevance. Goal. The main purpose of this work is to study the dependence of the mass and dimensions of the gears under study on their main parameters. Knowing the influence of various characteristics on the mass, it is possible to provide recommendations for the design of gears to achieve their optimal (smallest) dimensions, which leads to a number of significant advantages. Methodology. First of all, a rather detailed analysis of the scientific literature is performed in order to identify the main statements regarding the influence of certain parameters on the mass and dimensions of the designed gear. The very dependencies of the gear mass on its various characteristics are found by applying a numerical method that is entirely based on the known design dependencies for the design calculation of gears. Also, to compare the results obtained analytically, the method of calculating the mass and dimensions by creating 3D models of gears in the "Autodesk Inventor" environment is used in the work. Results. Based on the results obtained, it can be noted that, ceteris paribus, including gear load, the weight is almost independent of the module and the relative width ratio. At the same time, in some cases, a particular standard value can significantly affect the weight of the gear, i.e., by selecting specific values, it is possible to reduce the weight of the gear by about 15-25%. Originality. Useful results were obtained using a relatively affordable method. The research was conducted both analytically and with the use of modern computer-aided design systems. Practical value. The proposed recommendations for the rational choice of some characteristics of gears will reduce the weight and dimensions of the mechanical drive.

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