• Recycle rechargeable lithium – ion batteries

    pg(s) 9-10

    Milliards of dollars are set aside for preserving the life on planet Earth and help climate change. Unfortunately, the advances in technology are incapable to help us sort out this vital problem, because the more advanced the technology nowadays is, more irresponsible we become in taking care about consequences after the expiration date of it. It is not only the plastic pollution of ocean of our planet that stops the formation of oxygen but also the irresponsible disposal of lithium-ion rechargeable batteries for smartphones, tablets, computers, electric smart devices and vehicles that are no longer in use, create ionizing radiation and form a radioactive background that affects living and non-living organisms inhabiting our planet. So, when the technology cannot help us, then perhaps the pure science would come to the rescue of preserving ourselves. There are laboratory researches about recycling lithium-ion batteries and here where we are – we are going to implement mathematics, algorithms, indexed arrays(vectors) for describing the benefit of manufacturing the recycling of lithium-ion batteries.

  • Study of stress distribution of mechanical stresses in the frame of roller skates under dynamic load

    pg(s) 6-8

    As a result of the use of roller skates for recreation or sports on uneven surfaces other than a special one, there is a significant amount of mechanical energy absorbed by the frame of the skates as a result of unevenness, as well as combinations of jumps and landings from different heights. Scientific study on this issue will provide an opportunity to gain an insight into how much mechanical stress is distributed to а skate frame and to determine under what conditions the frame will be destroyed.

  • Analysis of the technological state of single-bucket cyclical excavators’ identification system testing results

    pg(s) 3-5

    Existing approaches to the electric cyclic action bucket excavators’ technological operations identification are considered. The authors proposed the term “technological condition” of a single-bucket excavator as a combination of the current technological operation and data on the technical condition of the main components of the excavator. Based on the data analysed, a new method has been developed and proposed for identifying the technological state of excavators based on the mathematical apparatus and tools of neural networks and pattern recognition, which can be used in further studies. According to the methodology proposed by the authors using pattern recognition technologies based on the OpenCV library and a stereo pair formed from two Xiaomi cameras, experimental tests were carried out on a real object – an electric single-bucket excavator type “direct shovel” ECG-8I under various environmental conditions, including poor visibility. According to the test results, the proposed method showed high accuracy in technological operations identification – the identification error in the test sample did not exceed 5%, which indicates the adequacy of the constructed model. The scientific novelty of the work lies in the application of a method not previously applied in this field of technology, as well as in the proposed mathematical and simulation models. The practical novelty lies in the possibility of introducing this approach for the construction of automated management, moni toring and control systems, for solving the problems of weighing rock in an excavator bucket, determining the granulometric composition of rock in a bucket, as well as other identification problems.

  • Reducer with a planetary gear train for a hoisting mechanism of dangerous goods cranes

    pg(s) 125-128

    In addition to the universal requirements for handling (lifting and transport) machines (HM), HM for dangerous goods (hot molten metal, containers with chemicals, explosives, etc.) must also meet a number of special requirements. One of these requirements is the drive of the hoisting mechanism with two motors, to ensure in case one of them fails.
    The article discusses a reducer for the hoisting mechanism of an overhead crane for dangerous goods with an embedded planetary gear train, allowing both motors to operate at full power (and without overload) in both regular and emergency (in failure) mode. The different modes of work of the mechanism are considered (with both motors and with each one separately). An analysis of the possible kinematic schemes of the planetary gear train is made. The necessary kinematic calculations have been made to select the most suitable variant of the planetary gear train.

  • Some requirements to the mechanisms of handling machines for dangerous goods and solutions for their satisfaction

    pg(s) 121-124

    The article reviews the requirements for the lifting mechanisms of cranes according to various regulations concerning dangerous goods. Particular attention is paid to these requirements regarding gear trains. Some design solutions for providing microspeed as well as for twin-motor drive are discussed. These arrangements are suitable for both lifting and travel mechanisms. A kinematic analysis was made and recommendations were given to the designers.

  • Overview of electric vehicles on-board chargers

    pg(s) 112-118

    Paper deals with general overview of the electric vehicles on-board chargers, available in operation – both for new such vehicles and for those that have been obsolete, but are still moving on the roads in our country and around the world. Studies have been conducted and useful information on battery-powered electric vehicles and plug-in hybrid electric vehicles has been systematized. All this is done in connection with the ubiquitous decisive steps for large-scale and global introduction of electric vehicles, such as appropriate choice and necessity and the related topics for drastic change of the car fleet, which will cover firstly urban vehicles, the energy balances of power grids of the individual countries with a careful analysis of the expected load for normal operation, the environmental benefits, the energy efficiency and economic benefits from the use of electric vehicles and their technical improvement in the long run. In addition, under good management, the development of electric mobility can be one of the ways for achievment of employment and industrial growth.

  • Determining the forces for a plate – spring at a pull clutch on the supporting straps

    pg(s) 88-89

    The development of vehicles and the expected higher demand those face-up requires lighter assemblies of the installation. The achievements in clutch design during recent years led to the so-called pull clutches. Their main features are higher compressive strength, lower shutdown power, cumulative design, calmer reception and torque transfer from the engine to other transmission. In this paper are shown the features of plate springs as a part of a pull clutch, the factors affecting the characteristics of plate-springs and the calculations of the forces for a clutch on the supporting straps. The results will show why that plate springs are increasingly used in motor vehicle clutches.

  • Application of regression analysis on some thickness measurement data collected for inner bottom plates of aging bulk carriers

    pg(s) 83-87

    In this article we analyzed real thickness measurement data collected on aged bulk carrier. Totally 25 aging bulk carriers were investigate under the 38 special ships surveys. As it is most important part of bulk carriers are fuel oil tanks, which can be located in different areas, in this article we analyze fuel oil tanks located in double bottom tanks. During exploitation life of ships there are lot of influenced factor as it is cargo operation, maintains, type of cargo, transport route and etc., which can accelerate corrosion and lead to different steal damage. From that reason it is important to analyze corrosion data in order to describe the expected corrosion. The aim of this article is to analysis totally 3136 thickness measurement data and find some correlation between the measured values and the time. It is clearly seen that the number of measurements increases with the time which can affect the results of the statistical analysis. Obtained statistical and graphical results show that the linear regression between statistical value and the Year parameter would be well appropriate to describe estimation model for inner bottom plates of bulk carriers.

  • Adhesive technology in the automotive industry

    pg(s) 79-82

    The paper presents the results of the research focused on the determination of the quality of adhesive joints of cold rolled sheets in the automotive industry. DC05 galvanized sheet was used for joints. A progressive type of adhesive used in the automotive industry was chosen. The shear and peel strength of the adhesive joints according to Winter were determined. The strength of the joints was determined depending on the cure temperature of the adhesive. After tests, the character of fracture surfaces of adhesive joints was evaluated.

  • Investigation of the thermostatic system of high-voltage components of an electric vehicle in real time during the XIL experiment

    pg(s) 75-78

    The automotive industry is facing new challenges in the electric vehicle segment. It is relevant to conduct joint research of various vehicle systems in a common virtual physical environment, which will allow combining a large number of test rigs located in different parts of the world. A common virtual physical environment, called X-in-the-loop, was developed, as a part of these studies. The work involves the joint connection and use of test rig for various purposes, software simulators, driving simulators, etc., to conduct a comprehensive study of the components and systems of electric vehicles in real time. The development of the thermostating system for highvoltage components is an urgent and important task when creating modern electric vehicles. A test rig was created at FSUE NAMI to study the operation of the thermostating system for high-voltage components of an electric vehicle’s traction drive. The test rig includes a physical simulation of high-voltage components of the traction drive of an electric vehicle from the point of view of temperature and hydraulic conditions of the components studied at other test rigs included in the XIL experiments. The scientific article presents the concept of a developed test rig. The article also describes the test modes that were necessary to conduct research on various components and systems of electric vehicles in various conditions. The article describes a method for controlling the actuators of the thermostating system and devices designed to reproduce the thermal and hydraulic characteristics of cooled objects (motor-wheels and inverters) in real time. A test rig for the study of the thermostating system of high-voltage components, modelling, prototyping and testing were carried out in the process of developing.

  • Studies of the efficiency of plain bearings used in microturbines

    pg(s) 48-50

    The article assesses the possibility of using plain bearings (using the example of radial bearings) in high-speed microturbines (up to 60,000 rpm). The results of mathematical modeling of the thermal state of bearings and the oil layer between the shaft and the bearing surface are presented. A detailed description of the stand, designed to analyze the effectiveness of radial and thrust composite plain bearings, is given. The test bench allows testing of radial, thrust and rolling bearings, taking into account the deformation of the shaft from the weight of the turbine and compressor wheels of the microturbine. The results of an experimental study demonstrate high accuracy of calculations.