Optimization and Operational Analysis of Electric Vehicle Operation with Fast-Charging Technologies

This work presents three demos, which include Electric Buses (EBs) from four various brands with lengths of 12 m and 18 m and an Electric Truck (E-truck) for refuse collection. The technical operation of these EVs were analyzed to implement further operational cost optimization on the demo vehicles. The Electric Vehicles (EVs) were tested against superfast-charging solutions based on Pantograph (Type A & Type B) on the route lines (and depots) and based on Combined Charging System Type 2 (CCS2, Combo2) from various brands to validate the interoperability among several vendors and support further EV integration with more affordable solutions. The optimization includes the calculation of the EBs’ consumption at various seasons and under various operating conditions in order to use optimum battery system design, heating system, optimum EB fleet operation and size and to find the charging solutions properly. The results showed that the EB consumption increases in some cases by 64.5% in wintertime due to heating systems, and the consumption in urban areas is more than that on the route lines outside cities. In the E-truck demo, where the electric heater was replaced with a heat-pump to optimize the energy consumption, it was found that the consumption of the heat-pump is about half of the electric heater under certain operating conditions. Under strict EB schedule, Pantograph charging solutions with power ratings of 300–600 kW have been adopted to charge the batteries of the EBs within 4–10 min. In order to minimize the cumulative costs of energy, (pantograph) charging infrastructure depreciation and battery degradation, as well as depot charging (at the bus operator’s depot), was adopted with a power level of 50–350 kW based on CCS2 and pantograph.

Theoretical studies of the force interaction of a three-axle vehicle with a stand with single rollers

The article discusses the issues of modeling conditions for obtaining diagnostic information about complex objects. Checking the braking and traction properties of three-axle trucks on a roller stand is considered as an example. As shown by many studies, in particular, which were carried out at the Department of Technical Operation and Service of Automobiles of the KhNADU (HADI), inertial stands provide more reliable information about the technical condition of the car. Such stands allow you to reproduce the real speed and thermal conditions of the brakes. To improve the accuracy of diagnosing a car on a roller stand, it is necessary to have an idea of the nature of the interaction of the car's wheels with the rollers. The study of the rolling of the wheels of a three-axle car bogie on the stand rollers was carried out at the Department of Technical Operation of Cars, KhNADU. However, all these studies were carried out on biaxial stands, where each bogie wheel rests on a pair of rollers. In order to exclude wheel slippage, partial braking is recommended, that is, a mode when partial force on the pedals (or pressure) is created in the system and, as a result, incomplete braking force develops in the braking mechanisms (or deceleration reaches some partial value from the full one). It is necessary to analyze the possibility of implementing full brake test modes on a roller stand by improving the layout and geometrical scheme of the stand. A power model of the system of interaction between a car and a stand has been developed, taking into account the design features of the stand and the design features of the suspension of a three-axle car. The power model of this system includes the equations of equilibrium of the body and two axles, as well as the equations of motion for the rollers and wheels of the car. Based on the results of the analysis of the acting forces in the "car-stand" system, the coefficients of the use of the load q during the brake tests of a three-axle car were determined, and the longitudinal stability of the car was also analyzed. The obtained research results allowed to improve the theory of interaction of the wheels of three-axle vehicles with single rollers of the diagnostic stand.

EXPERIENCE OF INTERNATIONALIZATION OF EDUCATION IN THE FIELD OF AGRICULTURE AND TRANSPORT

The need to develop educational programs in the field of agromechatronics programs, including international interaction, is justified. The results of the international summer online schools in the framework of the project ″Erasmus+″ № 585596-EPP-1-2017-1-DE-EPPKA2-CBHE-JP are presented: the geography of participants, their reviews. The features of the developed Master Program “Technical operation of transport and technological machines in the agro-industrial complex” are given.

LOCAL STUDIES OF ICE COVER EFFECTS ON DAM GATES

The experience of operation of surface emergency gates in ice-breaking conditions at a number of hydroelectric power plants has shown the insuffi cient eff ectiveness of the methods used to combat freezing of structures. The rules for technical operation of spillway dam gates in winter provide for heating of structures by slots, threshold and skin in conjunction with measures to maintain mines before construction. However, measures to heat gates and build mines are not always suffi ciently justifi ed and justifi ed. In order to obtain full-scale data and scientifi c information for the development of recommendations on operating and accounting modes during design, full-scale studies of stresses and defl ections in the load-bearing elements of the watershed gate of the hydroelectric power station were carried out. This article presents the results of fi eld studies in comparison with calculated values. As a result of the studies, information on the static operation of fl at gates in winter conditions is obtained, which is of theoretical and practical interest. The materials can be used to clarify technical operation rules and to clarify regulatory documents for the design of hydromechanical equipment at hydroelectric power stations.

Analysis of the state of creation of robotic complexes for humanitarian demining

The object of research is robotic military complexes used in the system of humanitarian demining. This work aims to study the requirements for robotic military complexes (including manipulators that are sucked into them) and to develop proposals for their use in humanitarian demining. The research is based on the application of a functional approach to the construction of models for the formation of requirements for robotic military complexes (RMC), which are sucked into the system of humanitarian demining. It is established that the creation of RMC requires a significant study of the core of the most important technologies that are needed to create the entire range of promising RMC. Thus the standard sample RMC can be presented in the form of set of functionally connected elements: the basic carrier, the mobile platform, the specialized hinged/built-in equipment in the form of a set of removable modules of useful (target) purpose, means of maintenance and service used at preparation for application and technical operation robot. The composition of specialized equipment is set based on the functional purpose of the RMC. The classification of RMC is given, which provides for their division into three categories: the first generation – controlled devices, the second generation – semi-autonomous devices and the third generation – autonomous devices. The analysis of modern RMC which are developed in Ukraine and the advanced countries of the world and the analysis of structure of components of system of humanitarian demining is carried out. It is established that the organization of the humanitarian demining system with the use of RMC should include of explosive objects (EO) reconnaissance, search, marking, their identification and direct demining. Unmasking signs of EO, as well as modern methods and detectors of EO detection are considered. One of the new promising methods of mine detection is parametric. However, in real application, the most promising is the use of a combination of electromagnetic, optical and mechanical methods. The application of the proposed approaches will increase the efficiency of humanitarian demining and reduce human losses in its implementation.

METHOD OF RELIABILITY IMPROVEMENT OF AIR-TO-SURFACE MISSILES CONTROL EQUIPMENT

The article analyzes the current state of the fleet of guided air means of destruction (missiles), the problems of repair and extension of the resource. The article substantiates the need for the transition of guided air missile of the "air-to-surface" class to operation according to the technical condition. The shortcomings of the existing inspection system for the technical condition of guided air weapon are shown. For the existing inspection system of technical operation of guided air weapon, one of the areas that will solve the problem of maintaining the combat readiness of aircraft is the transition to the operation of guided air weapon in technical condition. It is shown that the transition of guided air missiles to operation according to the technical condition and modernization of unguided air missiles involves strengthening the role of operations to measure and control their parameters and characteristics in order to determine the actual technical condition and make informed decisions about their further operation. Peculiarities of appearance of the Type 1 and Type 2 errors during control of a technical condition of aviation armament are presented. A method of increasing the reliability of air-to-surface missile control equipment by conducting control checks in the inter-check interval is proposed. The fundamental difference between the proposed information-redundant model of operation of guided air missiles and the classic model is the introduction into the system of operation a new diagnostic operation - an intermediate control check. Peculiarities of application of the developed method concerning calculation of both quantity of control checks and their periodicity within an inter-check interval are shown.

Increasing the durability of the coupling "crankshaft neck – bearing liner" by applying nanocomposite additives to the engine oils of marine medium-speed diesel engines

Повышение долговечности трибосопряжений судовых дизелей, определяющих их ресурс, представляет собой актуальнейшую проблему, обусловленную как безопасностью мореплавания, так и экономическими факторами. Основной причиной отказов коленчатых валов двигателей, определяющих необходимость капитального ремонта, является износ шеек. Решение проблемы повышения износостойкости и, соответственно, долговечности связано с применением трибоактивных присадок в смазку. Несмотря на глубокие и обстоятельные исследования в области применения органо-неорганических материалов для использования в качестве присадок в моторное масло для повышения долговечности трибоузлов осуществить выбор оптимального материала для конкретных условий практически невозможно, так как исследования выполнены для различных условий эксплуатации и по различным методикам. Цель работы – разработка триботехнической присадки к моторным маслам, обеспечивающей повышение надежности и эффективности технической эксплуатации судовыхсреднеоборотных дизелей путем формирования тонкопленочного металлокерамического покрытия на поверхностях трения стальных деталей трибоузлов, позволяющего получить оптимальный комплекс параметров материала износостойкого покрытия. В работе представлены исследования эксплуатационных свойств присадок в моторное масло 17 органо-неорганических триботехнических материалов 4 групп — природные и искусственные полимеры, из которых были изготовлены свыше 20 композиций и композитов. Установлено, что наиболее перспективным является использование нанокомпозитов на основе вермикулита, модифицированного кислотой, в качестве присадок в моторное масло, так как они обладают минимальными коэффициентом трения при граничной смазке (0,007–0,014) а также высокой износостойкостью стали 40Х и обеспечивают минимальную величину скорости изнашивания вкладыша подшипника, благодаря чему повышается ресурс трибосопряжения более, чем в 3 раза, и соответственно снижаются эксплуатационные расходы. Increasing the durability of the tribo-couplings of marine diesel engines, which determine their resource, is an urgent problem due to both the safety of navigation and economic factors. The main reason for engine crankshafts failures, which determine the need for major repairs, is the wear of the necks. The solution to the problem of increasing wear resistance and, accordingly, durability is associated with the use of triboactive additives in the lubricant. Despite in-depth and thorough research in the field of application of organo-inorganic materials for use as additives in engine oil to increase the durability of tribo-nodes, it is almost impossible to choose the optimal material for specific conditions, since the studies were carried out for various operating conditions and according to various methods. The purpose of the work is to develop a tribotechnical additive to motor oils that provides an increase in the reliability and efficiency of technical operation of medium-speed marine diesel engines by forming a thin-film metal-ceramic coating on the friction surfaces of steel parts of tribo-nodes, which allows to obtain an optimal set of parameters of the wear-resistant coating material. The paper presents studies of the operational properties of additives in engine oil of 17 organo-inorganic tribotechnical materials of 4 groups — natural and artificial polymers, from which more than 20 compositions and composites were made. It has been established that the most promising is the use of nanocomposites based on vermiculite modified with acid as additives in engine oil, since they have a minimum coefficient of friction with boundary lubrication (0.007-0.014) as well as high wear resistance of 40X steel and provide a minimum wear rate of the bearing liner, thereby increasing the tribo-tension life by more than 3 times, and, accordingly, operating costs are reduced.

Assessment of thermal dispersion of elements of ship technical means of sea vessels

статья посвящена экспериментальному исследованию и оценке теплового рассеивания элементов судовых технических средств при помощи тепловизора: силиконового демпфера и водоводяного охладителя высокооборотного двигателя, дейдвудного подшипника. Для дейдвудного подшипника представлены также вибрационные параметры контроля. Применяемые в экспериментальных исследованиях переносные приборы неразрушающего контроля допущены к применению в РФ, проходят систематическую поверку и калибровку. Результаты экспериментальных исследований показывают, что при накоплении статистических данных по оценке теплового рассеивания судовых технических средств можно разработать рекомендации по нормированию и прогнозированию их состояния. Полученные экспериментальные данные могут быть предметом рассмотрения Классификационным обществом для улучшения качества наблюдения за технической эксплуатацией судовых технических средств. Доказано, что применение такого метода позволяет определить, температурное распределение в судовых технических средствах с учетом режимов эксплуатации пропульсивного комплекса и дополнить представление о техническом состоянии сочетания с другими методами контроля для оценки и прогнозирования технического состояния судовых технических средств. Накопленный опыт в проведении экспериментальных исследований контроля технического состояния безразборным методом диагностики позволит перейти от классических подходов технической эксплуатации до новых, входящих в систему удаленного контроля и управления судовых технических средств автономных судов в эксплуатации. the article is devoted to the experimental study and evaluation of the thermal dispersion of elements of ship technical means using a thermal imager: a silicone damper and a water-water cooler of a high-speed engine, a deadwood bearing. For the deadwood bearing, the vibration control parameters are also presented. Portable non-destructive testing devices used in experimental studies are approved for use in the Russian Federation, undergo systematic verification and calibration. The results of experimental studies show that with the accumulation of statistical data on the assessment of the thermal dissipation of ship technical equipment, it is possible to develop recommendations for rationing and forecasting their condition. The experimental data obtained can be the subject of consideration by the Classification Society for improving the quality of monitoring the technical operation of ship technical equipment. It is proved that the use of such a method allows us to determine the temperature distribution in ship technical means, taking into account the operating modes of the propulsive complex, and to supplement the idea of the technical condition of the combination with other control methods for assessing and predicting the technical condition of ship technical means The accumulated experience in conducting experimental studies of technical condition monitoring by the non-disassembled diagnostic method will allow us to move from classical approaches of technical operation to new ones included in the system of remote control and management of ship technical means of autonomous vessels in operation

Research of problems of technical operation of agricultural machines

Tracking devices are increasingly used in automatic control systems for mobile agricultural machines. Many elements are regulated by standards and specifications, and it is of scientific and practical interest to establish a correspondence between the reliability of restored parts and connections with the reliability of machines. This is due to many reasons, one of which is a decrease in the technical potential of the village: the composition of the machine and tractor fleet is decreasing, the physical and moral wear of equipment is progressing. Repair and maintenance of cars due to the price arbitrariness of intermediary structures, mainly on the part of collective farms and farms. For this reason, the reliability and reliability of the machine park of rural producers remain low, negatively affects the agrotechnical timing of mechanized work, their cost. In accordance with the standard technology, standards of labor costs for the repair of machines, standards for the consumption of materials needed for repair, and standards for the consumption of spare parts were created. The economic feasibility of restoring parts is usually assessed by comparing the cost of a new part and the cost of repairing a worn one.

Laser treatment of ITO thin films with Carbon Nanotubes for Liquid Crystal Devices

In this paper, the influence of laser ablation on the refractive properties of indium tin oxides (ITO) thin films with deposited single-wall Carbon Nanotubes (CNTs) was considered. Sputtering of CNTs was preliminary based on the laser-oriented method with application of the external electric field. The laser ablation of ITO-CNTs coatings allows changing the electric, optical and mechanical properties dramatically. Moreover, this technical operation permit to switch the topology of the surface, thus it leads to the conversion of the refractive index. The possibility of index-matching due to the laser treatment contributes to the expansion of the technical capabilities of LC devices.