Repair Of Equipment Research Articles

Multi-objective Dynamic Scheduling of Circuit Repair Based on Improved NSGA-II

To deal with the problem of tight wartime repair time, heavy repair task, and complicated constraints during wartime, the multi-objective dynamic scheduling study of circuit repair equipment maintenance task scheduling was carried out. The military problem of equipment maintenance task scheduling for circuit repair under complex constraints was proposed. Considering the uncertainty of the repair status of the equipment to be repaired, the constraints such as repair time window, non-traversal, and variety of repair capability were introduced on the basis of the repair capability and the repair time limit. A multi-objective dynamic scheduling model that takes the total number of repaired equipment, the sum of equipment importance degree, and the total time of secondary operations as the scheduling target.is established. An improved multi-objective genetic algorithm based on NSGA-II is designed to solve the model, and the rationality and effectiveness of the model and algorithm are verified through example simulation and analysis.

ЛОГИСТИЧЕСКАЯ РЕГИОНАЛЬНАЯ СИСТЕМА ТЕХНИЧЕСКОГО СЕРВИСА АВТОТРАКТОРНОЙ ТЕХНИКИ

Compliance with the agrotechnical deadlines of agricultural production during field work largely depends on service companies, which must respond as quickly as possible to equipment failures and eliminate them qualitatively. The organizational structure of the regional logistics system for ensuring the operability of automotive equipment should also include services (specialized enterprises) to provide technical assistance in the event of breakdowns or accidents on routes. From the point of view of efficiency, it is most appropriate that such services are limited to performing repairs at the site of the breakdown or transporting the affected equipment, in the event of a serious breakdown, to the nearest repair and maintenance company. That is, so that there is also a specialization in certain jobs. At the same time, various forms of organization of interaction between repair and maintenance enterprises are possible, the organization of rapid response services of repair and maintenance enterprises – ambulance services for the maintenance of automotive equipment. The paper presents the main logistics research methods for the centralization of maintenance and repair of automotive equipment. The concept of logistics is analyzed, the basic principles are considered. A systematic approach is used to substantiate the structure of the regional logistics system for servicing automotive equipment and criteria for the effectiveness of its use. The main elements of the proposed regional logistics system are justified.

Operational research and diagnosis for service maintenance and repair of large-loaded equipment of the company Minetech Machinery LLC official dealer of Hitachi

The mining industry is one of the main industries that determine the country’s energy sovereignty. This article studies the effectiveness of organizational and managerial decision making, a separate subdivision of Minetech Machinery LLC, an official dealer of mining equipment from Hitachi, on the territory of the Russian Federation.

Optimisation of repair and maintenance costs for electrical equipment in agricultural enterprises

Application of mathematical methods of cost optimization for repair and maintenance of electrical equipment of agro-industrial enterprises is one of the important and promising directions for increasing the efficiency of electrical equipment operation management in agriculture. Mathematical programming systems use graphical and related attributive information in solving optimization problems. As graphical information in these systems we used maps, plans, diagrams, schedules of preventive measures from which the list of equipment for certain types of repair and maintenance, their labor intensity for individual objects, types of equipment and in total for the enterprise are established. Databases of electrical equipment are used as attributive information to describe electrical equipment of agro-industrial enterprises. Due to joint processing of graphical and attributive information in optimization systems, all stages of work with spatial data are more operative. Beginning from spatial data search, selection and analysis we can make a specific decision during the operation control of electrical equipment. This article considers maintenance and repair operation (MR) as a task of mathematical programming with cost optimization and deals with three approaches to the organization of this task. The expediency of using each method of solution is analyzed. The structural schemes, equations describing mathematical models, advantages and disadvantages of the presented models are given. We marked prospect of using linear programming programs for the decision of the given optimization problem by means of the inverse matrix method, i.e. the modified simplex method and computing algorithm with a standard sequence of operations.

Risk Analysis is a Prerequisite for Quality Management of Traction Rolling Stock Repairs

The paper considers a new version of IRIS ISO/TS 22163:2017 standard in relation to the quality of repair of complex equipment in the railway industry. It is shown that the new version of ISO/ TS 22163:2017 standard provides for the need of organizations to conduct risk analysis and accounting in their work. The authors propose to consider as an example a well-established analysis of the types and consequences of potential defects in FMEA process. The use of FMEA analysis made it possible to consider the significance of various risks of the quality of traction rolling stock repair, as well as to establish the importance of quality control operations for impregnation of a traction motor.

Development of a Monitoring System for Maintenance and Repair of High-Tech Equipment

The article presents a system for monitoring high-tech equipment, uses methods of system analysis and decision theory to optimize organizational tasks in the maintenance of high-tech equipment. The possibility of optimizing service channels based on the parameters set by the requirements for performing a certain type of work is considered. The monitoring system of high-tech equipment (MSHTE) is presented in the form of blocks that take into account all types of high-tech equipment, components and assemblies of each of them, technical characteristics, operating parameters, a list of the composition of engineering teams that perform the corresponding maintenance work.

Development of a sustainable environmentally friendly waste management system at large mass and sports events (2023 WJC in Novosibirsk)

Large public events (forums, championships, contests, olympiads) are events with a large number of spectators and participants, which, as a rule, leads to the generation of a large amount of waste. Mass sporting events are no exception, and when planning them, a special role is assigned to the creation of environmentally friendly waste management system. The subject of the research is the concept of waste management at the upcoming World Junior Ice Hockey Championship in 2023 in Novosibirsk. The article also discusses the types of waste generated in the functional areas of the competition grounds, studied the practice of handling solid waste: possible technologies for utilization and collection. The scheme of waste management at various stages of sports competitions is presented. Reasonable waste management should be based on the following principles: waste minimization, repair and restoration of faulty equipment and inventory, reuse of goods and materials, maximum recycling and composting, minimum burial and storage at landfills. Based on the results of the article, the main methods and recommendations for effective waste management at WJC-2023 were identified

Determination of the Clustering Potential of the Machine-Building Industry in Zaporizhzhia Region

The possibilities of creating cluster associations of enterprises in the sub-branches of the Machine Building Industry in the Zaporizhzhia region by determining the clustering potential are considered. The potential of clustering of the engineering industry enterprises of the Zaporizhzhia region was assessed by using the localization coefficients, production per person and specialization of the industries. According to the results of the assessment of the clustering potential of the machine-building industry in Zaporizhzhia there are such five sub-sectors were identified in which the creation of clusters is possible: the production of computers, electronic and optical products, the production of electrical equipment, the production of machinery and equipment that are not assigned to other groupings, the production of motor vehicles, trailers and semi-trailers and other vehicles, the production of furniture and other products; repair and installation of machinery and equipment. It is proved the need to create a еlectric equipment production cluster in Zaporizhzhia region.

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In the military units of the National Guard of Ukraine, a system for repairing automotive vehicles has been introduced, which provides for current, secondary and overhaul repairs. Maintenance of machines is carried out in order to eliminate malfunctions arising from the use of machines, and allows the replacement of individual units, including the main one. The average repair consists in the replacement or overhaul of not more than half of the main units. Overhaul restores the life of the machine and should be carried out at specialized enterprises of the Ministry of Defense of Ukraine or at other enterprises under contracts. Actually, in the military units of NGU, only current repairs are carried out. This is due to the high cost of overhaul and its low quality. Therefore, for the military units of the NGU, a diagnostic and recovery system for repairing automotive vehicles is proposed, including two types of repair: maintenance and restoration. The essence of maintenance repair consists in eliminating malfunctions, violations of adjustments during the operation of the machines according to the inspection, listening ? diagnostics with built-in and external diagnostic devices. Reconditioning repair consists in carrying out repair operations related to disassembling, troubleshooting, mechanical or other processing of component parts, assembling units, assemblies, testing them, and, if necessary, replacing them with new or repaired ones. Maintenance and repair repairs of automotive equipment are carried out only if there is a need for their implementation. It is proposed to establish ten parameters of the diagnostic and recovery system for the repair of automotive equipment at NGU and determine the life of the machine only before being discarding. The procedure for determining the number of machines that must be written off and get new ones to increase the non-reduced resource in each operation group is given.

ЙМОВІРНІСНИЙ ПІДХІД ДО МОДЕЛЮВАННЯ ДОЦІЛЬНОСТІ АУТСОРСИНГУ В ІННОВАЦІЙНІЙ ДІЯЛЬНОСТІ ПІДПРИЄМСТВА

Goal. Development of a probabilistic model that allows you to make a decision on the feasibility of outsourcing or insourcing auxiliary work (prevention, repair and reconfiguration of the unreliable equipment) of an industrial enterprise in order to increase its competitiveness when operating in unstable external and internal conditions. Method. The analysis of the main factors influencing the sustainable functioning of an industrial enterprise is based on the methods of scientific research: the methods of theoretical generalization, systematization and adjustment. The mathematical basis for constructing a probabilistic model is the reliability theory and the queuing theory. Results. The functioning of a modern industrial enterprise as a flexible production system is considered, some indicators of which are of a probabilistic nature. The flexible manufacturing system is viewed as a single-channel queuing system with a single machine and a simple input flow of orders. The main advantages of using outsourcing in industrial enterprises are determined. The possibility and efficiency of using the methods of mathematical statistics, reliability theory and queuing models in modulating the expediency of outsourcing is substantiated. The regularities of maintenance processes of flexible production systems are revealed, which allow formulating recommendations for choosing the optimal strategy for the system functioning and finding its possible characteristics. An economicmathematical model has been constructed that describes the process of functioning of the economic system, as well as its technical and technological maintenance. Based on the developed model, the issues of economic and mathematical substantiation of the expediency of transferring auxiliary production processes to outsourcing are considered. Scientific novelty. The main characteristics of the operation and maintenance of a production system with unreliable equipment and the total costs of its operation are determined. The problem of evaluating the expediency of outsourcing is considered. Practical significance. The study results form the scientific and practical basis for a management decision in order to achieve high competitiveness, ensure the efficient and sustainable functioning of the enterprise.

ЗНАЧЕННЯ РЕМОНТІВ ДЛЯ ПІДТРИМАННЯ НАЛЕЖНОГО ТЕХНІЧНОГО СТАНУ ОСНОВНИХ ФОНДІВ КОКСОХІМІЧНИХ ПІДПРИЄМСТВ (огляд)

Due to the excess operating life of the operating coke oven batteries in Ukraine, it is necessary to systematically carry out repairs to maintain the proper technical condition of the fixed assets of the coke oven production, primarily coke oven batteries. The article provides definitions of such concepts as the system of scheduled preventive maintenance of industrial buildings and structures, the system of maintenance and repair of mechanical equipment, maintenance, current repairs, major repairs, and the like. A classification of coke oven masonry repairs according to the scope of work, conditions and time of performance is stated, as well as documents regulating the procedure for their implementation are named. A brief overview of the types of repairs that are used to maintain the technical condition of coke oven batteries: preventive and current repairs (gunning, etc.), Medium repairs (partial relocation of the heads of the regenerator walls, heating walls and replacement of the reflowed packing), overhaul, which consists of partial re-laying a group of furnaces in a cold state (repairing furnace masonry with shifting walls to different depths, repairing and replacing reinforcement, repairing and replacing chimney and gas supply fittings). The main defects of coke oven battery masonry, which are subject to major repairs, are listed. It is noted that the cold group partial relocation of the furnaces is performed with gradual cooling and heating, which requires a complete or partial cessation of operation of the chambers adjacent to the ones being repaired (buffer and semi-buffer furnaces). It is emphasized that the work performed as part of the overhaul is determined by the technical condition of the battery, regardless of its age. It is noted that in modern conditions, the most effective is the relocation of the extreme and pre-extreme verticals of the coking chamber to a depth of 4-6 verticals on both sides without disconnecting the repaired chamber from heating. Keywords: coke oven battery, service life, technical condition, types of repairs, regulatory documentation. Corresponding author Fidchunov A.L., e-mail: fich.aleks@gmail.com

Training of small specialists in teaching chemistry

This article provides information on the training of junior specialists in the teaching of chemistry and the enhancement of their place and role in society, and clearly defines the tasks and objectives of junior specialists. Domestic service enterprises (workshops, service houses, workshops, salons) perform various activities related to the household. Apartment repair, furniture making and repair, laundry, dry cleaning, dyeing, individual sewing and prevention of footwear, clothing, fur and knitwear, repair of television, radio, consumer electronics, computer and office equipment, musical instruments, pawnshop (pawnshops), storage of cultural and sports goods, rental of household appliances, repair and cleaning of apartments, photo and beauty salons, hairdressing services and other similar work.

METHODS OF ACCOUNTING FOR THE PROCESSES OF REPRODUCTION OF FIXED ASSETS OF THE ENTERPRISE AS A SOURCE OF INTERNAL INVESTMENT FOR THE ENTERPRISE

The article is devoted to the research of current state of amortization policy in Ukraine. The article examines depreciation reforms carried out starting from 1997 up to the present time and makes the conclusion that they only brought the national depreciation policy closer to the countries with the market economy, but the real accumulation of funds for fixed assets was not achieved. Consequently, depreciation allowances are not only unable to stimulate the development of the economic entity, and are not able to even provide simple maintenance of basic (even manufacturing) facilities, which leads to their depreciation, and money for renovation or repair is not. In the work is stated that the use of a particular method of accrual of depreciation of fixed assets is appropriate to choose depending on the corrosiveness of the management functions, the objectivity, etc. The result will be to achieve the maximum effect from the application of the appropriate method of accrual of depreciation. The end result will be willingness of the subjects of management to the production of products (services). Examining current amortization policy, which was formed at the present stage of economic development in our state, continues to be ineffective. In our view, the current amortization policy does not fulfill its main function - motivation to the real accumulation of funds for renewal of worn and morally and technically outdated main assets of the enterprise. Today no company is not able during the regulatory period of service of fixed assets to offset their costs for their renewal, but for the need for renewal. We believe that the feasibility of choosing a method of accrual of depreciation must be carried out taking into account the correlation for the management functions, the objectivity and feasibility of use by a particular entity of management. Our proposed mechanism for selecting the optimal depreciation policy by the management of the enterprise, based on the real accumulation of "real" money can be a source of internal investment for renewal and renovation of basic assets of the state. The obtained results of the research is relevant in an environment where the deterioration of the basic equipment of enterprises is sometimes up to 90%, and the necessary funds for renovation and repair of the basic equipment of the enterprise.

ОЦЕНКА УРОВНЯ ГОТОВНОСТИ ОТЕЧЕСТВЕННОЙ ОТРАСЛИ РАСТЕНИЕВОДСТВА К ЦИФРОВЫМ ТРАНСФОРМАЦИЯМ

The main directions in the development of technical re-equipment in the modern world are the transition to a digital economy aimed at reducing costs through the use of computer technologies in the management, repair and regulation of equipment, the use of IT technologies to improve the quality and efficiency of technology. At present, serious «digital» transformations are taking place in the agro-industrial complex of Russia, as well as in other sectors of the economy. Identifying their directions, nature and degree of influence, in particular, on agriculture is an important urgent task. The article discusses the trends in the creation and implementation of digital technologies in the agro-industrial complex, as well as the demand for these technologies by the economic entities of the agro-industrial complex. The article analyzes foreign experience in the development of information and communication technologies in the agricultural sector and the peculiarities of the Russian approach to digitalization of the agricultural sector of the economy. The digital backwardness of the country is substantiated, which creates significant barriers to the digitalization of the domestic crop industry. Special attention is paid to the material and technical condition of the industry as a key element of digital transformations. It is emphasized that the informatization of technological processes in conjunction with the use of high-performance agricultural machinery in agriculture has a significant impact on the average annual number of employees of the crop industry. A model of a complete innovative integrated scientific and technical cycle of end-to-end digital systems for the Russian crop industry has been developed. A comparison of the dynamics of the indicators of the Digital Agriculture project and the total costs of its implementation made it possible to assess the level of readiness of the domestic crop industry for digital transformations.

Вдосконалення технічного сервісу автотракторної техніки в умовах агропромислового виробництва

The state of technical service of tractor equipment at the enterprises of agro-industrial production of Kirovograd region is considered. The tendencies of development of provision of agricultural production with various autotractor equipment are determined. The method of improving the quality of maintenance and repair of tractor equipment, improving its technical condition is considered. It is noted that the current condition, quality of equipment, its productivity and efficiency is not at the proper level, and therefore requires the transformation of the technical service system. The perspective organization of technical service at the enterprises of various level in which demand and offers for technics, especially foreign is considered is offered. It is noted that the branded technical service is carried out by the manufacturer through service centers, the main of which is the trade and accumulation coordinating enterprise in the system of the manufacturer. It is shown that the scheme of technical service should be based on the existing repair and maintenance base, the main directions in which the organization of works is carried out are specified. The main provisions of the modernized technical service are formulated, as well as the need to build a complete management structure of the technical service system. It is shown that in modern conditions to increase the effective system of technical service the role and importance of operational management and information support grows, it is offered to enter the information department common to all enterprise into the management system of engineering service. The main stages of operational management at technical service enterprises are clarified.

Analysis and development of methods for optimizing the management of repair activities of energy enterprises

Currently, research and developments in the field of monitoring and diagnostics of equipment of energy enterprises, as well as new approaches in the management of repair activities, have gained high importance. This is due to the increasing mechanism of aging of energy equipment. In the coming years, it is expected to increase the decommissioning of the main production fund, which is used at the limit of capabilities. There is a need for a comprehensive study and systematization of repair performance indicators, the development and improvement of existing methods for assessing the repair activity of equipment. New opportunities are emerging for digital-based research and development. The article considers issues related to the introduction of modern methods for optimizing the management of repair activities of energy enterprises. Theoretical and methodological provisions of existing systems for maintenance and repair of power plant equipment are described. Analysis was carried out, on the basis of which the advantages and disadvantages of these systems and methods of equipment diagnostics were revealed, the model for calculating the repair production factor “unit costs” was presented and considered.

Впровадження реагентної установки для регулювання кислотності оборотної води теплоенергетичного обладнання металургійного підприємства

The methods of regulating the indicator "pH water" of heat power equipment of metallurgical enterprise are analyzed. It is noted that the introduction of a reagent unit for regulating the indicator "pH of water" is the most optimal method. It was found that the use of the reagent has significant advantages compared with the repair of heat and equipment, which is affected by changes in water properties. This method is reliable, predictable, and analytical. The analysis of statistical information, the dynamics of changes in the required percentage of chemical reagents to obtain indicators with the value of "norm" at PJSC "Arcelor Mittal Kryvyi Rih" was carried out. Attention is focused on reaching regulatory indicators by the number of suspended substances, for which the treatment of circulating water with flocculants is used. To reduce the rate of corrosion and the formation on the surface of heat-and-power equipment of the gas cleaning film, which prevents corrosion, the treatment of circulating water with anti-corrosion inhibitors is used. Methods for regulating the indicator "ph water" have been systemized for the heat and power equipment. It is established that the transition of metallurgical enterprises to the method of regulating the indicator "ph water" for heat and power equipment with the help of a reagent is recommended firstly: after analyzing the need for automation of the process ( chemical reagent is often introduced into the water cycle), and secondly: the readiness of the enterprise for large investments ( reagents and chemical reagents for it are expensive), and thirdly: having a regional service representative, because there are not many service specialists). There have been proposed technological solutions affecting water quality indicators, namely efficiency of blast furnace dust collector (BF)-9, efficiency of gas cleaning elements of GO-5, raw materials and technological load of BF-9. Experimental laboratory tests of complex water treatment of GO-5 DP-9 cooling system were conducted. As a result, the estimated amount of 45 % NaOH solution to bring the pH of return water to the normative requirements of not less than 7,0, which is 134 tons of NaOH per month, was established. It is noted that the proposed method will lead to the introduction of NaOH, flocculants and corrosion inhibitors, which will reduce the presence of suspended solids from 150…200 mg/dm to 20 mg/dm, increase water pH to 7 units or higher. This will lead to a significant reduction in abrasion and chemical wear of the Go-5 DP-9 equipment and the water supply department pump station, which, in turn, will increase the service life of the heat and power supply and reduces the repair cost of this equipment.

The coefficient of technical readiness as an indicator of the effectiveness of the strategy of technical operation of lifting and transport equipment of terminals

Technical operation of lifting and transport equipment is one of the key problems of ports and terminals. The functions of technical operation include maintenance and repair of lifting and transport equipment. The imperfection of the maintenance and repair system leads to downtime of lifting and transport equipment, which affects the cost of loading and unloading operations. The main requirements for technical operation are to ensure the quality and speed of loading and unloading operations with minimal operating costs. One of the indicators for assessing the quality of technical operation is the coefficient of technical readiness, which shows that the probability that the lifting and transport equipment will be in a working state at any time, except for periods in which operation is not provided. These periods include the time when the lifting and transport equipment is being maintained and repaired. Technical operation strategy is selected based on the technical readiness coefficient.

Research of the state of the engineering service in AIC and use of new technologies

The article presents the results of analysis and research on the state of the engineering service of the agro-industrial complex, as well as the analysis of the "Strategy for the development of agricultural engineering in Russia for the period up to 2030" from the standpoint of its eff ectiveness in providing the agro-industrial complex of the Russian Federation with the necessary amount of agricultural machinery. Assess the actual state of the agricultural machine-building industry and the needs of the Russian Federation agro-industrial complex in updating the machine park. To substantiate the organizational and technological models for maintaining the performance of agricultural machinery, primarily energy-rich, in modern operating conditions using new technologies. The analysis of publications of domestic and foreign authors, refl ecting the state of the engineering service of the agroindustrial complex. The factors that determine the choice of an organizational and technological model for maintaining the operability of equipment in relation to the conditions of the agro-industrial complex of Russia are investigated. Received and processed statistical information on the current state of the equipment park and enterprises of the repair and service base of the agro-industrial complex. Based on the results of the study, the state of the fl eet of agricultural machinery used was determined, as well as the ability of the repair and maintenance base of the agro-industrial complex to ensure its performance. The results of the study showed that the implementation of the positive capabilities of various life support systems of equipment and systems for maintenance and repair is hampered by the unstable position of participants in the processes of production, use and renovation of equipment. It was also revealed that the fl eet of equipment is outdated, requires large volumes of maintenance and repair, and the repair and maintenance base of the agro-industrial complex in Russia as a whole is not able to fulfi ll the tasks of providing the necessary level of technical assistance when using agricultural machinery

ОПЫТ И СРАВНИТЕЛЬНЫЙ АНАЛИЗ ЭФФЕКТИВНОСТИ ЭКСПЛУАТАЦИИ ДИЗЕЛЬНЫХ И ЭЛЕКТРИЧЕСКИХ ПОГРУЗОЧНО-ДОСТАВОЧНЫХ МАШИН

The prospects for expanding the mineral resource base of the Zhezkazgan deposit are inextricably linked with the improvement of equipment and technologies for mining. On the basis of the Zhezkazgan deposit, an innovative platform has been created for the introduc-tion of new self-propelled equipment to ensure the specified rates of expansion of the mineral resource base of the operating mines in the region. A retrospective analysis of the stages of technical re-equipment of mines in the Zhezkazgan deposit was carried out. For this, a com-parative analysis of the efficiency of operation of diesel and electric forklifts has been carried out. It has been proven that the simplified design and lower failure rate of the electric drive can reduce the amount of equipment maintenance and repair work, thereby minimizing the downtime of LHDs and the cost of servicing mining equipment.