Maintenance Of Stock Research Articles

RESOURCE-SAVING MAINTENANCE AND REPAIR OF SPECIAL SELF-PROPELLED ROLLING STOCK

The article provides the issues of improving the models of reliability and optimization of maintenance and repair of special self-propelled rolling stock (SPRS) with a compatible system of diagnostics. A new maintenance strategy is proposed, taking into account the new requirements of the self-propelled rolling stock. Examples of solving practical problems of reliability indices are considered.
 The study of the reliability of SPRS, as an object, is advisable to start with its presentation in the form of a system of assembly units. In this sense, the level of consideration is important. Figure 1 gives a structural diagram of SPRS, as a system consisting of elements. for several possible levels of consideration. SPRS, as a system of elements, makes it possible to concretize the task of analyzing and improving the reliability model and developing measures to perfect it.

WITHDRAWN: A survey on impact of data analytics techniques in E-commerce

Data Analytics plays a vital role in e-commerce. All the e-commerce companies implemented data analytics in their firm. It also helps better stock maintenance, to build a robust supply chain, analyze information to detect fraud, predicts what's in store for you, personalize recommendations for your customers, forecast inventory for the next season, measure your marketing and Personalize the customer's shopping experience. Data analytics used to compete between various e-commerce companies. The analysis is done based on the historic and statically data. From the study, it has been concluded that the characteristics of the data grown and changing day by day. Hence, we need new models and algorithms to collect, store, process, analyze, and evaluate the data in the e-commerce field.

Методика выбора марочного состава седельных тягачей с использованием интегрального коэффициента

The article presents a solution to the problem of choosing the brand composition of truck tractors for the recruitment of transport divisions of oil pipeline enterprises. The main task of transport departments is to meet the needs of the main production. The equipment is operated under harsh conditions, as well as after the end of the regulatory period of use and needs to be updated quickly. Despite the timely maintenance and repair of freight rolling stock, frequent failures and increasing repair costs make further operation economically inefficient. When updating the fleet of vehicles, there is a problem in choosing the best in terms of the technical characteristics of the vehicle, but at the minimum cost. The purpose of the study is to optimize the costs of acquiring and operating special equipment of Transneft-Siberia JSC by developing a methodology for determining the rational grade composition of truck tractors. According to the a priori ranking method, the opinion of specialists and heads of transport divisions of Transneft-Siberia JSC was determined. For the study, the most popular brands of truck tractors of domestic and foreign production were chosen. As a result of the survey, the ranks of operational indicators of truck tractors and their weight are determined by the reverse ratio. The most signifi¬cant indicator as a result of a priori ranking is the cost of one unit of the vehicle. Integral coefficient components calculated relative to average value of each indicator are identified for each indicator. As a result of the study, it was revealed that for the renewal of the fleet of truck tractors, it is advisable to give preference mainly to foreign manufacturers. The integral factor, taking into account the weight of operational parameters, makes it possible to objectively evaluate the quality of truck tractors. The method of determining the integral coefficient is proposed, when using which it is possible to reduce the cost of acquiring and operating vehicles with an increase in the development of special equipment. Further areas of research are determination of integral factors for the fleet, including technological transport, as well as determination of the optimal nomenclature of special equipment for transport divisions of oil pipeline industry enterprises.

Substantiation of the theoretical and methodological approach to planning the work of rolling stock in the conditions of Eastern Siberia

The substantiation of the theoretical and methodological approach was carried out as a result of identifying probabilistic indicators that affect the planned performance of the rolling stock and determine the properties of the types of activities for the maintenance and repair of rolling stock, the transportation of goods by transport units that provide the main production of oil and gas in Eastern Siberia. The work of special equipment is taken into account. The specificity of road, transport, climatic, seasonal conditions is taken into account when planning the production and labor intensity of each unit of rolling stock, presented as a set of parts, and assemblies.

ІНВЕСТИЦІЙНО-ІННОВАЦІЙНА ДІЯЛЬНІСТЬ ТРАНСПОРТНО-ЛОГІСТИЧНИХ ПІДПРИЄМСТВ В УМОВАХ СУЧАСНОГО БІЗНЕС-СЕРЕДОВИЩА

The urgency of researching the issue of investment and innovation activities of transport and logistics companies in today's changing business environment is due to a significant increase in competition in the transport market. The article examines the main types of innovations that can be implemented by domestic transport and logistics companies, in particular: modernization of the company's fleet, the transition to more economical and environmentally friendly fuels for rolling stock, maintenance of rolling stock in good working order, transportation of goods in multimodal and intermodal communications, use of bar codes, GPS-navigators, systems of tracking the location and movement of goods, telepathic technologies, electronic signatures. The innovative approach is used to address the issues of packaging, handling, loading and unloading, and transportation of non-standard and rare goods. The use of a customer service system allows you to constantly communicate with customers and speed up the response to the request. The implementation of innovations is carried out through investment. Transport and logistics companies can use different sources of funding, which include public, private and foreign investment resources. The main stages of making effective management decisions on the implementation of innovative projects are analyzed. At the preparatory stage, it is important to assess the state and potential of the enterprise, as well as institutional, meso- and macroeconomic factors that may affect the innovation and investment activities of transport and logistics companies. For selected investment projects, their strategic assessment of compliance with business development directions and long-term strategic goals of the company should be carried out. Further, the possibilities of the investment project implementing should be checked, as well as cash flow forecasting for the project should be carried out. At the next stage, based on the analysis of the balance sheet and report on the financial results of the enterprise, the calculation of financial ratios is carried out and a conclusion about the financial capacity of the project is made.The final stage is evaluation of the economic, social and ecologic effectiveness of selected projects. It is substantiated that at the level of the business entity it is necessary to clearly define the priority of investment and innovation development and its impact on performance indicators.

ПОВЫШЕНИЕ ЭФФЕКТИВНОСТИ ТРАНСПОРТА ЭКСТРЕННОЙ СЛУЖБЫ ПУТЕМ УСТАНОВКИ СИСТЕМЫ МОНИТОРИНГА ШИН

One of the main tasks of transport is the complete, high-quality and timely satisfaction of the needs of the population, ensuring the quality of transportation with minimal expenditure of material and labor resources, as well as ensuring maximum safety of the transport process. The solution of this problem requires the primary development of public road transport, increasing freight and passenger traffic, ensuring the safety of the transport process, strengthening the material and technical base and concentration of vehicles at large motor transport enterprises, improving the maintenance and repair of rolling stock of both public, commercial and personal transport of the population. The article considers emergency vehicles that must comply with a large list of requirements of the rules of the controlling UN. Not always given due attention to the tires. Due to the workload, numerous calls that matter every second. The transport used at the ambulance station is selected. The most common wide – area van is Gaz 332214, the van has a frame structure, the car is equipped with ABS, the wheel formula is 4x2 with rear-wheel drive. The van is considered from the point of view of economy and maneuverability due to the correctly selected tire pressure, in aggressive and extreme driving. The installed tire monitoring system automatically selects the correct tire pressure by analyzing the external and internal temperature of the tire. The monitoring system reduces fuel consumption, environmental pollution, increases the service life of the tire, and thus the entire suspension as a whole. This equipment allows you to keep the pressure in the tires even when the wheel is punctured, thereby reducing the time to reach the emergency call.

ОРГАНИЗАЦИЯ КОМПЛЕКСНЫХ СИСТЕМ ОБЕСПЕЧЕНИЯ ЭКСПЛУАТАЦИОННОЙ НАДЕЖНОСТИ ПОДВИЖНОГО СОСТАВА

The use of digital and satellite information systems for the increase of quality and prompt maintenance and repair of rolling stock allows solving important transport tasks. On the modern stage the transportation process sets high requirements to operation of rolling stock that should be regulated by state standards. Modern machinery and technology should promote implementation of high-quality production in order to extend the life cycle of any product that responds the realization of production process. The international practice of standard application convincingly proves it. The paper proposes an organization of complex systems aimed at provision of operational reliability of rolling stock. The authors have determined possible reasons of non-compliance of the standards. As a result, they have set tasks on carrying out modern monitoring and execution of maintenance and repair.

Breeding Particle Swarm Optimization for Railways Rolling Stock Preventive Maintenance Scheduling

The goal of railway rolling stock maintenance and replacement approaches is to reduce overall cost while increasing reliability which is multi objective optimization problem and a proper predictive maintenance scheduling table should be adequately designed. We propose Breeding Particle Swarm Optimization (BPSO) model based on the concepts of Breeding Swarm and Genetic Algorithm (GA) operators to design this table. The practical experiment shows that our model reduces cost while increasing reliability compared to other models previously utilized.

An Industry 4.0 Technology Implementation Model for Rolling Stock Maintenance

Railway operators are being challenged by increasing complexity and safeguarding the availability of passenger rolling stock, bringing maintenance and especially emerging technologies into the focus. This paper presents a model for selection and implementation of Industry 4.0 technologies in rolling stock maintenance. The model consists of different stages and considers the main components of rolling stock, the related appropriate maintenance strategies and Industry 4.0 technologies considering the maturity level of the railway operators. Relevant criteria and main prerequisites of the technologies were identified. The model proposes relevant activities and was validated by industry experts.

Optimization of the freight transportation system within the raw material enterprises

The article presents the results of a study to establish the relationship between the planned indicators formed in the operational work of the road transport enterprise when transporting goods and the indicators formed in the current work. The authors consider the functioning of a road transport enterprise in the current mode on the methodological basis of the theory of road freight transport, the theory of rolling stock maintenance, the system approach, using economic and mathematical methods. The criterion for optimising planning is the profit of the road transport company, and the constraints are the output, mileage and labour intensity of maintaining the rolling stock, which depends on the probability values of the length of the ride with freight, the mass of the freight, average technical speed and time for loading and unloading. The application of the developed methods and mathematical model to optimise planning will make it possible to study the functioning of a road transport enterprise as a probabilistic system and to determine planning indicators, considering the influence of random factors that appear in the current and operational work of the road transport enterprise.

Planning rolling stock maintenance: Optimization of train arrival dates at a maintenance center

<p style='text-indent:20px;'>A railway network is an indispensable part of the public transportation system in many major cities around the world. In order to provide a safe and reliable service, a fleet of passenger trains must undergo regular maintenance. These maintenance operations are lengthy procedures, which are planned for one year or a longer period. The planning specifies the dates of trains' arrival at the maintenance center and should take into account the uncertain duration of maintenance operations, the periods of validity of the previous maintenance, the desired number of trains in service, and the capacity of the maintenance center. The paper presents a nonlinear programming formulation of the considered problem and several optimization procedures which were compared by computational experiments using real world data. The results of these experiments indicate that the presented approach is capable to be used in real world planning process.</p>

Overview of the Intelligent Operation and Maintenance System for Shanghai Rail transit Rolling Stock

The traditional rolling stock maintenance model based on planned repairs and fault repairs cannot meet the needs of the rolling stock operation and maintenance for superlarge-scaled networks. There is an urgent need to establish a highly automated and information-based rolling stock intelligent operation and maintenance system based on online monitoring. This paper introduces the composition, main functions and application situations for the Shanghai rail transit intelligent rolling stock operation and maintenance system as well as suggestions for further work related thereto so as to provide references for the development of the rolling stock intelligent operation and maintenance system of the rail transit industry.

Research of the effect of temporary reservation on the reliability of equipment locomotives

The article deals with the issues of the effect of the temporary reservation of the work of a separate locomotive equipment on its reliability, under the conditions different laws of distribution of time of work, time of recovery, time for temporary reservation. At the same time, the issue of the influence of the random nature of the occurrence of refusals with the justification of the strategy of their prevention is considered. The effect of temporary reservation of work of separate equipment of locomotives on its reliability is investigated. Calculation takes place taking into account different laws of distribution of time of work to the failure, time on recovery, time on temporary reservation. This research is relevant because, in recent years, in our country gradually develops high-speed railway traffic. In the majority, the high-speed rolling stock (SRS) operating in the country, built abroad, and not always the mode of its operational loads meets the recommendations of suppliers of this technique. This leads to a breakdown in train traffic and great downtime, due to both the general condition of the railways and the intensity of the use of this SRS. One more negative factor is the problem of organization of technical maintenance (TM) and current repair (СR) of this rolling stock. But not only for SRS there are such problems, because the current traction rolling stock has reached or exceeded the normative term of use, the repair base is updated slowly, technological processes TM and СR are not corrected during the life cycle. All this requires both practical and theoretical substantiation of the strategy and tactics of TM and СR of the transport rolling stock. Therefore, there were formulated and scientifically substantiated methods for ensuring and improving the reliability of technique, on the basis of the analyzed functional relationships between the reliability indicators and the calculated ratios for reliability indicators of complex systems, which are is the traction rolling stock and locomotives. It has been determined that the temporary reservation of the work of the locomotive systems significantly affects the time to the failure, recovery time and readiness factor and significantly improves these parameters, in contrast to the system performance without temporary reservation. It is also concluded that it is advisable to organize the recovery process in such a way that the distributions of time for recovery were close to gamma-distribution. And the value of the readiness factor depends significantly on the type of the law of distribution of exploitation to failure and the type of the law of distribution of time for recovery.

ВИЗНАЧЕННЯ НОРМ ЧАСУ НА ТЕХНІЧНЕ ОБСЛУГОВУВАННЯ ТРАНСПОРТНОГО ЗАСОБУ ДЛЯ ФОРМУВАННЯ ТРУДОМІСТКОСТІ РОБІТ

У роботі розглянуті актуальні питання визначення норм часу на обслуговування і ремонт транспортних засобів для формування трудомісткості робіт технічного обслуговування та поточного ремонту рухомого складу підприємств автомобільного транспорту, що використовуватимуться під час їх технологічного розрахунку. На основі існуючих норм часу на виконання різних видів робіт запропоновано граф технічного обслуговування (ремонту) автомобіля за яким розроблено методику визначення норм часу та трудомісткості технічних впливів на автомобіль. Граф технічного обслуговування (ремонту) транспортних засобів служить графічною моделлю для подальших розрахунків норм часу та забезпечує перехід від об’єкта впливу до елементарних операцій. Такий підхід дозволяє розподілити елементарні операції і врахувати особливості їх виконання. Розроблена методика сприяє подальшому розвитку методів визначення трудомісткості технічного обслуговування для технологічного розрахунку підприємств автомобільного транспорту. Проведено аналіз величин трудомісткостей технічного обслуговування транспортних засобів. На прикладі, проведення регламентних робіт з технічного обслуговування нижчого порядку для автобуса за допомогою методів аналізу затрат робочого часу та використовуючи норми часу на слюсарні операції, здійснено орієнтовний розрахунок його сумарної трудомісткості. Отримані результати вказують на скорочення часу виконання операцій технічного обслуговування автобуса, а від так і зменшення встановленої трудомісткості близько 40 % у порівнянні з нормативом.

Ecosystem services and sustainable development: Perspectives from the food-energy-water Nexus

The maintenance of the total natural capital stocks has received increased attention worldwide for its ability to achieve sustainable development. However, the claim that ecosystem services (ES) contribute to sustainability has not been sufficiently verified. In this study, we explore how major ecosystem functions affect food, energy, and water (FEW) sustainability. This research addresses the importance of ecosystems and services provided, which sustainability depends on. Specific types of sustainability – food, energy, water, and fundamental ES with regional GDP are chosen to exam this relationship using the pressure-state-response framework. The results show that ecosystem services are indispensable keys to successfully achieving sustainable development goals. The research findings also illustrate a scheme for emphasizing how economic development can be a factor contributing to a multi-objective case study. Our approach may help guide future cooperative applications to achieve food, energy, and water sustainability while protecting ecosystem services.

The Effect of Residues of Plant Rotation Patterns with Cover Crop Legums on Soil Organic Carbon Dynamics and Corn Products During Two Seasons of Planting

This study aimed to estimate wherewith the residual effect of the crop rotation pattern with the cover crop lagoon on the dynamics of soil organic carbon and maize yield during the two growing seasons in the Kupang region of Indonesia. The treatments evaluated were: maize rotation pattern with several types of seasonal legume cover crops and how to return the legume biomass. The results showed a very significant increase in soil organic carbon and maize yield. The rotation pattern with legumes P. lunatus, M. pririens and C. juncea had a statistically significant effect on increasing soil organic carbon storage and maize yield during the two growing seasons. These three types of legumes still have a positive effect until the second planting season where there is an increase in soil organic carbon storage (at a depth of 0-30 cm) of 0.75-1.19 % C-organic (82.08 to 84.38 t.ha-1 soil carbon storage) compared to C.chayan and control treatment which decreased soil organic carbon storage was greater. About maize yields, up to PS- 2 still showed relatively stable results, namely only a decrease in maize yield (kg.ha-1) of 3.14% -4.19% compared to C. chayan which decreased yields of 15% and without control rotation ) with a reduction in yield of up to 30% . The method of restoring the cover crop legume biomass with the mulching technique was able to increase soil organic carbon storage by 0.71%, and the yield of dry shelled maize (kg.ha-1) on PS-2 only decreased yield by 2.48% compared to the immersion method which reduced the yield up to 11, 02%. This study found that the rotation pattern does not need to be done every planting season. Still, it is sufficient to do it in intervals of two to three growing seasons. The residual effect can significantly guarantee the maintenance of organic carbon stocks in the soil. With the assurance of soil organic carbon stores coupled with proper management, soil productivity is maintained and sustainable. When soil organic carbon increases, it can benefit maize and other food crops.

Analysis of Reasons for Discard of Blood and Blood Components in a Tertiary Care Hospital in South India

Background: Blood transfusion is an important and essential constituent of present health-care delivery system. Millions of lives are saved every year in regular and emergency situations by the accessibility of safe blood transfusion services. This emphasizes the need for proper utilization of blood and its components with preferably “NO” or minimal wastage. The aim of this study was to find out causes for discarding blood and blood components.
 
 Methods: Retrospective analysis was carried out at Vinayaka Missions Medical College and Hospital Blood Bank from October 1st, 2018 to October 31st, 2019.
 
 Results: The total number of donors from whom blood was collected during this study period was 2522. Out of which 2507 units of components were prepared. The overall discard rate of blood and its components was 5.95%. Among those 5 (33.33%) whole blood, 28 (1.25%) packed red blood cell concentrate, 93 (4.16%) fresh frozen plasma, 157 (57.51%) platelet concentrate were discarded. The common causes of discarding blood components were due to expiry date 211 (74.56%), 30 (10.60%) were due to sero-reactivity for transfusion transmitted infections, 23 (8.13%) due to leakage of components, 13 (4.59%) due to low volume and other causes were 6 (2.12%).
 
 Conclusion: Blood being irreplaceable source, discard rate can be reduced by proper counselling of blood donors, conducting donor screening, adhering to strict donor deferral criteria, notification and counselling of permanently deferred donors. Properly implementing blood transfusion policies will help to utilize the blood components in a proper way, thus resulting in discarding a smaller number of blood bags due to expiry. Continued medical education for technicians with regards to maintenance of proper stock, quality indicators, review of blood management system will further help in reducing discard rate.

Service maintenance and repair of passenger cars in the concept of Digital Enterprise

The passenger rolling stock has a number of specific technical characteristics based on original design and technological solutions. The consequences of the passenger rolling stock failure cause unplanned downtime, resulting in: reduced productivity, traffic safety and quality of service, as well as financial losses. Determination of cost-effective maintenance and repair becomes one of the key tasks in the operation of passenger rolling stock. At present the tools for planning maintenance and repair of passenger rolling stock are static. They do not take into account dynamic information during the life cycle of the rolling stock. The planning tools are mainly a copy of the maintenance and repair organization manual. This article deals with the digital model of maintenance and repair of passenger rolling stock as a transformation of strategy from diagnostic to predictive. The modeling serves as a fundamental starting point in managing the life cycle of passenger rolling stock. The theory of passenger rolling stock life cycle is complemented by the theory of management, creating a model of service maintenance and repair. The digital model covers the life cycle of the passenger rolling stock from initial planning to a multitude of solutions, such as: separation in the mechanism of financing, service operator selection, definition of key performance indicators for the operator, setting fees, maximum profit, providing access to all operators of railway services. At the conceptual level, the fundamental aspects of the digital service model have been developed to forecast future events and make optimal plans, taking into account the multivariate and structural heterogeneity of data in the virtual networks. The modeling approach oriented to the global description of the business process and distributed management of service maintenance and repair is considered.

Biogeochemical Controls of Particulate Phosphorus Distribution Across the Oligotrophic Subtropical Pacific Ocean

AbstractWe investigated basin‐wide distributions of total particulate phosphorus (TPP) and associated biogeochemical parameters in the euphotic zone (EZ) of the subtropical North and South Pacific Ocean. TPP is primarily composed of living microorganisms, and its distribution is likely controlled by nitrogen (N) supply in typical N‐limited Pacific waters as well as phosphorus (P) supply in P‐limited western North Pacific. TPP concentrations showed a vertically uniform distribution (approximately 15 nM) within the EZ at most stations, but at several northern North Pacific stations, TPP peaks (>20 nM) were observed in the lower EZ where nitrate and nitrite concentrations were high. Relationships between TPP and biogeochemical parameters indicate that a possible factor controlling TPP in the upper EZ was dinitrogen fixation and that in the lower EZ was shoaling of the nitracline. Geographical distribution of TPP was relatively uniform compared to that of phosphate, which varied from <10 nM in the western North Pacific to >100 nM in the eastern North and South Pacific. The western North Pacific was a domain characterized by lower dissolved organic P (DOP) concentrations, higher alkaline phosphatase activities, and higher particulate polyphosphate (PpolyP):TPP ratios compared to other domains. These characteristics indicated that active DOP utilization and PpolyP accumulation could play important roles in the maintenance of TPP stocks as alternatives to phosphate utilization in this distinctive domain. Our results demonstrated that TPP distributions were vertically and geographically uniform across the subtropical Pacific Ocean, concealing that TPP stocks were likely underpinned by a range of nutrient supply mechanisms.

Do you have confidence in how your rolling stock has been maintained? A blockchain-led knowledge-sharing platform for building trust between stakeholders

This study explores the potential of blockchain technology in enhancing trust among the stakeholders responsible for the maintenance of rolling stock. Although the technology has been widely successful in the financial sector, it is still novel in the maintenance field. Given the customized nature of maintenance processes, it is unclear if a suitable consensus protocol can be identified that can enhance trust among stakeholders. This problem is investigated through the lens of the Design Science Research Methodology. First, the theoretical background of blockchain technology and its role in enhancing trust are explained, followed by the analysis of a current case at a Railway company to test the proof of concept. A business network archive is developed for the maintenance management of the sliding step of the train door system. The archive encompasses the business logic and transactional data required to enhance trust among stakeholders in the quality of performed maintenance. The developed archive is deployed on Hyperledger Fabric and the effectiveness of the solution is evaluated through a survey. The results show that the developed business network, deployed on a customized Hyperledger Fabric consensus protocol, enhanced trust among the stakeholders involved.