The article considers the issue of designing at an early stage electromechanical drive of the lifting platform, which is a set of asynchronous frequency-controlled electric motor, two-stage involute bevel gear and lever mechanism scissor type. At the preliminary stage of designing the electromechanical drive of the lifting platform, its structure, types of engines and mechanisms included in it, as well as the main technical characteristics of the drive were determined. In particular, we determined the parameters of the linkage (geometric and mass-inertial characteristics), gear reducer (geometrical parameters, modules, numbers of teeth, gear ratio), carried out the choice of motor, calculation is made of kinematical and power characteristics, as well as dynamic study of the drive. The preliminary design was carried out using the Mechanic program, which does not require significant resources of a personal computer. As a result of the pre-design study, a schematic and structural solution of the lifting platform and electromechanical drive was formed, and their main technical characteristics were determined. As a result, it was proved that the use of the Mechanic program can be effectively applied at the initial stages of the design of the lifting platform, as well as various lifting and transport mechanisms and machines.

This article justifies the use of hand operated percussion machines with a linear electromagnetic drive for connecting building reinforcement in steel cylindrical bushings. The most suitable percussion energy was selected for connecting reinforcement with a diameter of 10-14 mm, which is most often used in floor slabs and building foundations. Having compared the crimp and welded joint tensile strength, it was found that the quality of such joints is comparable. With the help of the “operator — machine — workpiece” model system, the most vibrational phases of the shock cycle of the percussion machine were identified, and using the machine model as an oscillating system, frequencies were determined at which vibration acceleration measurements should be performed. It has been experimentally established that the level of vibration load during pressing reinforcement is within acceptable values, however, there is a need to reduce vibration load on the device body. The results of the research show that with the help of hand operated percussion machines with a percussion energy of 50 J, it is possible to connect building reinforcement Ø10-14 mm. At the same time, it is necessary to improve the design of known machines to ensure vibration safety.

In article reveals a possibility of assessment of danger and risks of wheel automobile vehicles when using in various climatic conditions on the example of operation in Iran. Results of the analysis of climatic and road service conditions of automobile vehicles are given in the Republic Iran. Special attention is paid to the analysis of constructive safety and breakdown rate of the cars manufactured in Iran. The general approach to assessment of non-failure operation and risks of automobile vehicles is described taking into account the defining factors. The order of assessment of risks is shown on the example of the brake system of the widespread car in the country. The technique of the analysis and assessment of risks offered in article allows to increase reliability and safety of operation of the car thanks to the prevention of refusals and prevention of possible accidents. The organization of operation of new models of automobile vehicles and justification of guarantee certificates of the supplier with application of the offered two-stage approach allows to develop and introduce in practice of work of the motor transportation enterprises and dealer companies system of the technical actions providing accident-free operation of vehicles and cutting expenses on car repairs during the guarantee period taking into account regional features of operation.

The results of research in the field of transport and logistics technologies and machines for the urbanized environment, obtained by scientists of the Academician I.G. Petrovskii Bryansk State University in 2019. The description and analysis of the effectiveness of new technical solutions in relation to the designs of manipulating systems of mobile transport and technological machines, passenger and freight ropeways and mobile transport and handling rope systems is given.

Vibration loads have a great impact on the durability of the car and its comfort. The need to improve vibration protection systems, to conduct vibroacoustic analysis and develop new methods for optimizing vehicle vibrations as a whole is a modern and urgent task for the automotive industry.In the research work, we investigated vibration and noise problems associated with the integration of the transmission of the vehicle body, as defined methods to improve vibration isolation properties of the vehicle by optimizing vehicle body stiffness characteristics.The practical significance of the work is to identify recommendations for reducing the vibration loads transmitted to the driver, which will make it possible to make optimal technical decisions in the early stages of the development of the vehicle body.Using engineering analysis or combined methodologies, the process for optimizing the vibroacoustic characteristics of the vehicle should be based on a systematic approach and evaluate the appropriate compromise between a high level of safety, weight reduction, ensuring vehicle fuel economy and customer requirements such as controllability and vibroacoustic comfort.In the article, based on the analysis of literary sources, vibroacoustic phenomena associated with various transmission components and subsystems are identified. The frequency ranges and the nature of the displayed noise are established.It is established that the sensitivity to acoustic oscillations of the body is determined by the transfer function of vibration loads and noise from fastening elements (for example, axle bearings, transmission supports) to the body and vehicle control elements.One of the key performance indicators of a car body structure is its static and dynamic stiffness. To ensure good filtering of the vibration load, the local dynamic stiffness of the body in the installation zones must be several times higher than the corresponding rubber stiffness, and the natural frequencies of torsional vibrations of the body should not coincide with the natural frequencies of the unsprung mass and the frequency of the engine idle.

In the article the review of devices for protection of hydraulic systems from emergency emissions of working fluid at depressurization of pipelines is given. The information on the influence of hydraulic oil used in the working fluid quality on the environment is presented. It has been established that hydraulic oil spilled on the surface as a result of emergency discharge during depressurization of discharge pipes belongs to the waste of the 3rd hazard class. The period of recovery of the environment after the harmful effects of spilled hydraulic oil is at least ten years and is a violation of environmental and sanitary-epidemiological requirements. A mathematical model has been developed that includes the equations of hydraulic oil flows and leaks from the damaged part of the discharge pipeline, the volume of spilled hydraulic oil, the intensity of pressure changes in the discharge and discharge lines. The results of numerical solution of mathematical models on the impact parameters of the hydraulic system on the dynamics of pressure changes in the injection and drain lines in search of information parameters for building devices that exclude significant loss of working fluid. It is established that the pressure derivative is the information parameter for the creation of the system of protection of the hydraulic system from emergency emissions of hydraulic oil.

The article discusses the task of modeling the working hydrodynamic processes occurring in hydraulic drives with frequency-throttle regulation of the mechanisms of movement of traction and load-bearing ropes, at all stages of the movement mechanism — the stage of acceleration of the transported cargo, the stage of steady (stationary) movement with constant speed and the stage of braking when approaching the final breakpoint. As a circuit that implements throttle control, possible hydraulic circuit designs for sequential installation of adjustable throttles relative to the hydraulic motor are considered — one-sided installation of one throttle and two-sided installation of two throttles with the same and different settings. To solve this technical problem, a mathematical model of the hydraulic drive and a computer program that implements it were developed. The model provides a computer simulation over time of the processes of change over time of such basic technical characteristics of the hydraulic drive as pressure and volumetric flow rates of the working fluid at characteristic points along the length of the hydraulic system, pressure drop across the hydraulic motor and instantaneous hydraulic drive power, as well as kinematic and power motion parameters of traction and load-bearing ropes (distance traveled, linear speed and acceleration, required power, overcome operating loads). In relation to a specific variant of the mobile rope complex, the calculations of the indicated hydrodynamic, kinematic and power parameters were carried out, as well as the analysis of the results obtained. The effect of various options for installing adjustable throttles and their settings on the calculation results is shown.

This study examines the effectiveness of the innovative product container-transformer «SmartBox» in the Russian market of transport and logistics services. The transport companies need not just machines for cargo transportation, but effective solutions to transport problems, that allow increasing the profitability of the business. The container-transformer «SmartBox» claims to be a qualitative decision of the problems formed in the market of transport and logistics services today. The investigation is carried out in agro-industrial sector of the economy as the most significant for the Rostov region. According to experts the agro-industrial complex will soon become a driver for the development of cargo transportation. The study was conducted on the example of the largest agricultural holding of the Rostov region group of companies «Yug Rusi». The research task is to substantiate the technical and economic advantages of using the container-transformer «SmartBox» for the transportation of liquid vegetable oil. The analysis of the current state of the transport and logistics system in the field of agriculture was carried out to solve this problem. A review of currently used methods of road transportation of liquid vegetable oil was conducted, the shortcomings was identified. The existing shortcomings in the sphere of container cargo transportation are analyzed. The key requirements for container transportation by transport and logistics companies are identified. A qualitative comparative analysis of the technical and economic parameters of the container-transformer «SmartBox»and traditional methods of transportation of liquid vegetable oil was carried out. The relevance of this research is the practical value for the development and improvement of the system of cargo transportation.

Reduction of vibrations of the human operator of road and construction machinery, emerging and transmissible human operator through his workplace while driving cars, is an important task, since the vibration of the human operator adversely affect the processes of its life, performance and fatigue, precision machine executable operations etc. The advantages for use of vibration isolation systems have mechanical devices without the use of hydraulic and electric components as the more reliable and durable. Among them can be highlighted Vibration system using hopping mechanisms. Hopping mechanism provides a negative stiffness when force produced by a similar mechanism, co-directed the deviation from the equilibrium position, and increases with the deviation. The combination of such a mechanism with conventional spring provides a quasi-zero stiffness. According to the developed kinematic schemes of three jump mechanisms considered as an example: Mezis truss, rhombus mechanism, and three-point mechanism, analytical equations are constructed by direct inference that relate the value of the deflecting force of the mechanism from the movement of the working point associated with the payload in the form of a chair with a person the operator. The obtained analytical dependencies allowed a comparative analysis of the static characteristics of the three mechanisms with a jump. The overall dimensions of the mechanisms and the stiffness of the springs were taken equal. The graphs of vertically directed forces created by the considered mechanisms are given, depending on the vertical movement of the working point in the range of ten centimeters. In addition, the dependences of the values of the curvature of the functions of the vertical forces of the three mechanisms on the vertical movement of the working point are obtained by a numerical method. A comparative analysis showed the advantages of the rhombic and three-point mechanisms over the Mezis truss in terms of providing less curvature of the functions of the deflecting force from the displacements of the working point, as well as a smaller number of springs. In rhombic and three-point mechanisms, tension springs are used instead of compression springs in the Mezis truss. The greatest deflecting force with the same spring stiffness and the same overall dimensions of the mechanisms creates a three-point mechanism.

A well-known disadvantage of pneumatic tires is the cessation of the ability to work with mechanical damage through and determines the need to search for fundamentally new design solutions for automobile wheels to increase the safety of automobiles and the survivability of wheeled vehicles. One such solution is the use of airless tires made of elastic polymeric materials. The Department of Mechanical Engineering and Transport of the Bratsk State University has developed full-scale models of wheels with airless tires made of elastic polyurethanes of Russian production for a car. The theoretical evaluation of the resilientible properties, load capacity and force heterogeneity of the experimental models was carried out by the finite element method. Electronic solid-state geometric models of airless tires have been created. Attributes of electronic models correspond to the nominal parameters of the physical models of automobile wheels. Nonlinear elastic isotropic models of polyurethane elastomers were adopted for nonlinear static analysis. The characteristics of the normal suppleness of airless tires and the graphs of oscillations of normal force with constant normal deflection in different positions of the wheels relative to their central transverse planes are the results of finite element modeling and calculation. Theoretical research results may be claimed by manufacturers of wheeled vehicles and tractors, construction and road vehicles, special motor vehicles and wheeled planetary rovers.

The article considers the issue of creating a parametric part in Autodesk Inventor using iLogic technology, which allows engineers to create parametric 3D models of objects, controlled by calculations written using the rules of the Visual Basic language inside the CAD program itself. The article presents an algorithm and tools for creating controlled 3D models using iLogic on the example of a 3D model of a gear wheel. Depending on the input input data, which are the transmitted torque, gear ratio and contact voltage, Autodesk Inventor performs design and verification calculation of the gear wheel, as a result of which, each time the input data is changed, the 3D model is instantly rebuilt and its geometric parameters and weight are displayed on the screen. The user-friendly interface of dialog boxes of input of initial data and output of results of calculation of a detail is created. The article provides examples of research conducted using the software Autodesk Invevtor with the use of iLogic, analysis of changes in geometrical and physical parameters of the gears for various combinations of source data, data on the time of receipt of the results. ILogic technology allows the engineer to create a library of standard and standard products in a CAD program to get a quick rebuild of the geometry of the product, which is based on the calculations in CAD programs immediately after you change the source data specification. Parameterization of three-dimensional models using iLogic technology will allow the engineer to solve various research and optimization tasks in a short time.

The magnitude of the external loads and impacts on the mobile transport and technological machine depend on the current motion mode and its parameters. The article presents approaches to the simulation modeling of the motion modes of a mobile transport and technological machine. Modeling involves two stages. In the first stage, using simulation model are determined by parameters of the motion (a rotation of different modes of movement, machine speed, the duration of modes). In the second – with the help of mathematical model of dynamics examines the workflows of mobile transport technological machine. The results of the simulation are a set of values of the motion parameters, as well as the implementation of the dynamic loading process.

Milling is the main workflow for trailer and self-propelled road mills, recyclers and process complexes for road construction and repair. Their application allows achieving high quality of works, to provide complex mechanization and to provide high productivity. In process of technological operation, sharply variable random loads occur on working element. The paper discusses the model of forming the resistance moment on the mill. The case is presented when it consists of sections, each of which has several cutting planes, with different number of knives in the plane and radius along the ends of cutting elements. The article proposes a method of calculating mutual spectral densities of resistance moments at different sections of the mill. Expressions are obtained, which make it possible at design stage to calculate spectral density of moment on working member taking into account its design, angular velocity, random variability of physical and mechanical properties of treated medium, depth of milling. Probabilistic characteristics of the mill loads serve as initial information for dynamic analysis of the drive system and unit design, its strength analysis, selection of optimal parameters and operating modes.

The article describes the results of petrographical and petrochemical studies of ultrabasites and basites of the Teskuduk-Chengeldi massif of the Northern Tamdytau (Western Tien Shan). The main minerals-carriers and minerals-concentrators of chromium, nickel and cobalt, platinoids, gold, silver and rare-earth metals are determined. Using the mass-spectrometric analysis (ICP-MS), a geochemical characterization of the rocks of the massif was obtained and their specialization in chromium, nickel and cobalt was confirmed. The contents of gold, silver, and related elements (Se, Sb, Te, As, Bi) increasing from peridotites to gabbroids and their derivatives. The conclusion is made about the formation of the ore-magmatic system of the Teskuduk-Chengeldi massif under spreading conditions, the evolution of which formed chrome-nickel mineralization with platinum and gold-silver loading.

A LP-19 mathematical model of the felling and bulking LP-19 machine articulated manipulator has been developed, which allows to reveal the laws of movement of the boom and stick, as well as the working body racks depending on the volume of working fluid in the hydraulic cylinders of the boom drive. Based on the results of mathematical modeling, a method and means for controlling the trajectory of the stick, boom and working body is developed by one integrated control device that provides working body movement close to plane-parallel. The dependences of the position of the working body in the vertical plane on the outreach of the boom and handle were revealed when using the developed integrated control device for the trajectory of the handle, boom and working body and without its use. Using the developed integrated device for controlling the trajectory of the handle, boom and working body provides deviations from the vertical working body with horizontal movement of the boom and handle in the range from +5 to –11 cm. Using the developed integrated device for controlling the trajectory of the handle, booms and working body provides a relative reduction in deviation from the vertical of the working body with horizontal boom movement in the range from 150 to 1600% compared with the base felling and bulking LP-19 machine. It has been experimentally established that the use of the developed integrated control device provides a reduction in the time of the guidance operation of the working body (changing the boom outreach) from 13.2 s up to 7.7 s. It was experimentally established that when using the developed integrated control device, the average production time of 1 m3 of wood is less than that of the base machine, which allowed to increase the productivity of felling and bulking LP-19 machine by 17%.