Defense of the dissertation of Mambetov Dulat for the degree of Doctor of Philosophy (PhD) under the educational program «8D07113 - Transport, transport technics and technologies»
The L.N. Gumilyov Eurasian National University will defend the dissertation for the degree of Doctor of Philosophy (PhD) by Mambetov Dulat on the topic Increasing the operational reliability of special machinery through the quick interchangeability of its equipment under the educational program «8D07113 – Transport, transport technics and technologies».
The dissertation was carried out at the «Transport engineering education department» of L.N. Gumilyov Eurasian National University.
The language of defense is russian
Official reviewers:
Zhanar Zhumashevna Zhunusbekova –Associate Professor of the Department of Transport Engineering and Logistics Systems at the Abylkas Saginov Karaganda Technical University, Doctor of Philosophy (PhD), Karaganda, Kazakhstan.
Nurbolat Sakenovich Sembaev –Head of the Department of Transport Engineering and Logistics at Toraighyrov University, Associate Professor, Candidate of Technical Sciences, Karaganda, Kazakhstan.
Temporary members of the Dissertation Council:
Nursultan Balgaevich Zharkenov –Head of the Department of Transport Engineering and Logistics Systems at the Abylkas Saginov Karaganda Technical University, Associate Professor, Doctor of Philosophy (PhD), Karaganda, Kazakhstan.
Daniyarov Nurlan Asylkhanovich-Chief Specialist of the Personnel Development and Training Department of the Talent Management and Personnel Administration Department of Kazakhmys Corporation LLP, Doctor of Technical Sciences, Professor, Karaganda, Kazakhstan
Davran Oktambaevich Radjibaev –Professor, Tashkent State Transport University, Doctor of Technical Sciences (DSc), Tashkent, Uzbekistan
Scientific advisors:
Zhundibayev Valeriy Ermekbaevich- Professor of the Department of Space Engineering and Technology at the L.N. Gumilyov Eurasian National University, Doctor of Technical Sciences, Astana, Kazakhstan.
Sakhapov Rustem Lukmanovich, Professors at the Kazan Federal University, Doctor of Technical Sciences, Kazan, Tatarstan.
The defense will take place on June 05, 2026, at 10:00 AM in the Dissertation Council for the training direction «8D071 – Engineering and engineering trades» under the educational program «8D07113 – Transport, transport technics and technologies» of L.N. Gumilyov Eurasian National University. The Dissertation Council meeting will be held offline and online.
Link: https://teams.microsoft.com/meet/43753260342967?p=ZK8lKFWsrwx7s1W81Y
Address: 2 Satpayev Street, Room 302, Astana,
Abstract (English):ANNOTATION to the dissertation of Dulat Muratovich Mambetov entitled “Increasing the operational reliability of special machinery through the quick interchangeability of its equipment”, submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy (PhD) under the educational program 8D071300 – Transport, Transport technics and Technologies The dissertation research of Dulat Muratovich Mambetov entitled “Improving the Operational Reliability of Specialized Machinery through Quick-Change Working Equipment” is devoted to solving the relevant scientific and technical problem of improving the operational reliability of specialized machinery used at landscaping, horticultural, and municipal service enterprises. The relevance of the research topic is обусловлена тем, that under the current conditions of urban infrastructure development, there is an increasing need for the efficient operation of specialized machinery intended to perform a wide range of tasks in the municipal and landscaping sectors. The operation of such machinery in a modern metropolis is characterized by the territorial dispersion of work sites, high variability in the types of operations performed, the seasonal nature of production processes, the need for frequent transitions from one technological operation to another, and limited time available for machine readjustment. A significant share of working time losses is associated with the downtime of specialized machinery during the replacement of working equipment, machine reconfiguration, and organizational delays. These factors directly affect the availability coefficient, actual productivity, and overall operational reliability of specialized machinery. In this regard, there is a need to develop scientifically substantiated technical and organizational solutions aimed at reducing the time required to replace working equipment, increasing the adaptability of machines to various types of operations, and improving the management of technological processes. The study corresponds to the current trends in the development of science and technology in the fields of transport engineering, urban engineering infrastructure, and municipal services, and is also aligned with the priorities for the modernization of municipal infrastructure in the Republic of Kazakhstan. The research idea is that improving the operational reliability of specialized machinery used by landscaping and municipal service enterprises can be achieved through the implementation of the modular principle of machine design, the use of an intermodule positioning and fastening device to ensure quick-change working equipment, as well as through increasing the level of dispatching of technological processes. The working hypothesis of the research is based on the assumption that the use of a modular structure of specialized machinery with quick-change working equipment makes it possible to reduce the time required for machine reconfiguration when performing different types of work, increase the machinery availability coefficient, improve actual productivity, and reduce the probability of unplanned downtime while maintaining the required level of failure-free operation. The purpose of the dissertation research is to improve the operational reliability of specialized machinery used by urban municipal services by ensuring the modularity of the machinery structure, the quick-change capability of working equipment depending on the invariance of the types of work performed through the use of an intermodule positioning and fastening device, and by increasing the degree of dispatching. To achieve this goal, the following objectives were set and solved in the dissertation: To analyze the current state of the technical, technological, and organizational use of specialized machinery, as well as its operational reliability when performing work in landscaping and municipal services. To develop a classification of specialized machinery based on the modularity of its structure and the interchangeability of working equipment in order to optimize the quick-change process. To determine the criteria affecting the operational reliability of specialized machinery and to propose design and organizational measures aimed at its improvement based on the analysis of scientific, engineering, and patent solutions for the intermodule positioning and fastening device. To develop efficiency criteria taking into account the relationship between the technological, geometric, and strength parameters of interchangeable working equipment and the parameters of the intermodule positioning and fastening device and the wheeled chassis, as well as an algorithm for improving the level of regulatory control of technological processes in landscaping and municipal services using specialized machinery built on the principles of modular structure and quick-change working equipment. To carry out a financial and economic assessment of the proposed solution in comparison with similar solutions of foreign companies. The object of the research is the process of operating specialized machinery at landscaping and municipal service enterprises in the conditions of a modern metropolis. The subject of the research is the patterns of influence of design modularity, quick-change working equipment, and the level of dispatching on the operational reliability of specialized machinery. Research methods. The dissertation employed methods of systems analysis and comparative analysis to study the current state of operation of specialized machinery used by landscaping and municipal service enterprises and the existing design solutions for quick-change working equipment; classification and structural analysis methods in developing a classification of specialized machinery based on the principles of modular design; engineering design and engineering analysis methods in developing the intermodule positioning and fastening device; methods of mathematical modeling and mathematical statistics to determine efficiency criteria and assess operational reliability indicators, including the availability coefficient, failure-free performance, and machinery productivity; methods of technical and economic analysis to evaluate the effectiveness of the proposed solutions and compare them with foreign analogues; as well as experimental methods to verify the operability and effectiveness of the developed design solutions under production conditions. The scientific novelty of the research lies in the development of a comprehensive methodology for improving the operational reliability of specialized machinery, taking into account both technical and organizational aspects. Within the framework of the study, such operational reliability indicators as the availability coefficient, failure-free performance, and productivity of specialized machinery used in landscaping and municipal services were proposed and evaluated when using the intermodule positioning and fastening device. A classification of specialized machinery used in landscaping and municipal services was proposed based on the principles of structural modularity. The influence of the number of reconfiguration operations and the time required for reconfiguring working equipment on the availability coefficient of specialized machinery and actual productivity was identified. A methodology for improving the operational reliability of specialized machinery by ensuring the quick-change capability of working equipment was substantiated. A method for optimizing the intermodule positioning and fastening device based on criteria taking into account the parametric series of working equipment was developed. An algorithm for improving the level of operational management based on dispatching was proposed. The theoretical significance of the research lies in the development of scientific provisions for improving the operational reliability of specialized machinery based on its modular structure and the quick-change capability of working equipment. Approaches to the classification of specialized machinery, the determination of its operational reliability criteria, and the establishment of relationships between the design parameters of interchangeable equipment, the intermodule positioning and fastening device, and operational efficiency indicators were further developed. The practical significance of the research lies in the possibility of applying the technical and organizational solutions developed in the dissertation at landscaping and municipal service enterprises. The proposed intermodule positioning and fastening device, which ensures the quick-change capability of working equipment, makes it possible to reduce the duration of operations related to replacing working units, reduce specialized machinery downtime, increase the availability coefficient, and improve the actual productivity of machines when performing various types of work. The use of the modular principle in the design of specialized machinery contributes to the more rational use of a single base machine with different types of interchangeable equipment, thereby reducing the need to expand the fleet of narrowly specialized machinery and increasing operational efficiency. The practical value of the results also lies in the possibility of introducing dispatching elements in order to improve the responsiveness of technological process management and the coordination of machinery operation under conditions of dispersed work sites. The research results have been implemented in the activities of Astana-Zelenstroy LLP, TransTechService 2025 LLP, and are also used in the educational process of the College of Management of Astana. The technical solutions obtained in the course of the study are confirmed by protection documents and may be used in the development and improvement of domestic models of specialized machinery. The following main provisions are submitted for defense: – the modular principle of designing specialized machinery for landscaping and municipal service enterprises, based on the use of a universal wheeled chassis and interchangeable working equipment, ensures an increase in operational reliability and adaptability of machinery to various types of work; – the use of the intermodule positioning and fastening device ensures effective quick-change replacement of working equipment and reduces the time required for reconfiguring the technological machine; – the time required for replacing working equipment and the number of reconfiguration operations have a significant influence on the availability coefficient and actual productivity of specialized machinery; – the use of a modular structure of specialized machinery and quick-change working equipment ensures an increase in the availability coefficient and productivity while maintaining practically unchanged failure-free performance indicators; – increasing the level of dispatching of technological processes is an important organizational factor in improving the efficiency of specialized machinery operation. In the course of the dissertation research, the following main results were obtained. An analysis of the current state of operation of specialized machinery and interchangeability of working equipment at landscaping and municipal service enterprises was carried out. A classification of specialized machinery and types of work performed based on the modularity of the structure and the interchangeability of working equipment was developed. The necessity of using modular specialized machinery based on a universal wheeled chassis with interchangeable working equipment was substantiated. An intermodule positioning and fastening device ensuring a reduction in the time required to replace working equipment was developed. The influence of quick-change working equipment on the availability coefficient and actual productivity of specialized machinery was established. An algorithm for improving the level of dispatching of technological processes in the operation of specialized machinery was proposed. A technical and economic assessment of the effectiveness of the proposed solutions was carried out. The practical significance and applicability of the results were confirmed through implementation under production conditions. The validity and reliability of the research results are ensured by the use of generally accepted scientific research methods, the logical consistency of the purpose, objectives, methods, and obtained results, the application of mathematical modeling and engineering analysis methods, as well as the comparison of theoretical provisions with the results of practical approbation. The reliability of the results is confirmed by the implementation of the developed solutions in production activities and in the educational process. Approbation of the research results. The main results of the dissertation were reported and discussed at the IX–XIII International Scientific and Practical Conferences “Actual Problems of Transport and Energy: Ways of Their Innovative Solution” held in 2021–2026. Publications on the dissertation topic. The main scientific results of the dissertation were published in 3 conference papers and 5 scientific articles, including 3 articles published in journals recommended by the Committee for Quality Assurance in Science and Higher Education of the Ministry of Science and Higher Education of the Republic of Kazakhstan, and 2 articles published in journals indexed in the Scopus database. The following protection documents were obtained based on the research results: Patent of the Republic of Kazakhstan for utility model No. 8168 dated February 23, 2023, “Method and Device for Ensuring Quick-Change Replacement of a Working Unit”; Patent of the Republic of Kazakhstan for utility model No. 9769 dated September 10, 2024, “Mechanical Quick-Change Device for an Excavator”; Certificate of Entry into the State Register of Rights to Copyright-Protected Objects No. 32986 dated February 23, 2023, “Method and Device for Ensuring Quick-Change Replacement of a Working Unit.” The doctoral student’s contribution to the preparation of publications consists in identifying the scientific problem, formulating the purpose, objectives, and hypothesis of the research, conducting a review of domestic and foreign literature, developing a classification of specialized machinery and types of work, participating in the development of the intermodule positioning and fastening device, carrying out analytical, computational, and experimental studies, interpreting the results, and preparing the publication manuscripts. For publications prepared in co-authorship, the doctoral student’s contribution consists in direct participation in the development of the scientific idea, preparation of the computational and analytical part, generalization of the results, and writing the main sections of the articles. The implementation of the research results is confirmed by their introduction into the production activities of Astana-Zelenstroy LLP, TransTechService 2025 LLP, as well as into the educational process of the College of Management of Astana, which is confirmed by the relevant implementation acts. Conclusion. The dissertation consists of an introduction, four sections, a conclusion, a list of references, and appendices. The dissertation solves the relevant scientific and technical problem of improving the operational reliability of specialized machinery used by landscaping and municipal service enterprises by ensuring the quick-change capability of working equipment based on the use of an intermodule positioning and fastening device, implementing the modular principle of machine design, and increasing the level of dispatching of technological processes. In the course of the research, theoretical provisions were substantiated, and design and organizational solutions were developed aimed at reducing the time required for reconfiguring specialized machinery, increasing its availability coefficient, improving actual productivity, and reducing the probability of unplanned downtime while maintaining the required level of failure-free operation. The obtained results possess scientific novelty, theoretical and practical significance, and their effectiveness is confirmed by implementation in production activities and the educational process. The developed provisions and recommendations may be used in the design, modernization, and operation of specialized machinery with quick-change working equipment for landscaping and municipal service enterprises.
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