bluuebunny/crossref_metadata_2025_split huggingface dataset:
Automatic control a stiffening of links as a means of adaptation of mechanical systems
Authors: Balakin P D , Dyundik O S , Zgonnik I P , Fedorova M A 
Published: January 2020

Abstract
The publication presents some technical solutions of mechanical systems created on the basis of gears, the design of which includes additional elements with nonlinear properties.
The characteristics of such elements with automatic control stiffness control allow to implement a universal design approach mechanical systems providing the property of adaptation to variable external loading of mechanical systems at the design stage, while improving the dynamic quality of the system.
Experimental studies of arcjet thruster in pulsed mode of operation for corrective propulsion systems of small spacecraft
Authors: Blinov V N , Fedyanin V V , Shalay V V , Yachmenev P S 
Published: January 2020

Abstract
The paper presents the results of experimental studies of an arcjet thruster in pulsed mode of operation on nitrogen with a thrust value of up to 32 mN and energy consumption of up to 30 watts. The pulse mode of operation of the arcjet thruster is provided by the developed power source. At measured values of temperature at the nozzle and pressure in the arc chamber of the engine in a pulsed mode of operation define the basic characteristics of gas-dynamic functions of gas flow. The forecast of the achieved values of the specific impulse when using ammonia as a working fluid is carried out
Advanced design of friction piles for operation in complicated soil conditions
Authors: Gruzin A V , Gruzin V V , Rusanova A D 
Published: January 2020

Abstract
Development of advanced designs for friction piles is a problem solution to reduce material costs at the stage of a pile foundation construction in complicated soil conditions. The constructive approach aimed to a rational use of construction materials in production of piles is proposed in this paper. The idea of technical proposal is to change a shape of a pile cross-section to increase the length of a perimeter limiting the area, invariable in a size. An equilateral triangle cross-section meets fully these requirements. Results of theoretical studies and the analysis of existing calculation method of bearing capacity of a friction pile in a foundation soil showed a possibility of practical implementation of this engineering approach. The utilization of a pile with a cross-section in a shape of equilateral triangle increases bearing capacity of a pile in a foundation soil up to 28.6 % in comparison with a round cross-section and up to 14 % compared to a square cross-section. Conducted laboratory studies confirmed the correctness of theoretical calculations. The application of obtained results of theoretical and laboratory studies in the construction of pile foundations in complicated soil conditions will not only reduce material costs for the foundation production, but will also decrease transportation costs which are rather high under development of new fields.
Technological process modeling for ink filling in the high accuracy screen printer mesh
Authors: Hilal H A , Litunov S N , Belkova S V , Bochkareva S S , Trifonova E N 
Published: January 2020

Abstract
Printed electronics is a modern direction in developing technology of electronic components production. The purpose of the work is to control the thickness of the conductive pattern on the print obtained by screen printing. The task of the study is to develop a mathematical model for ink filling the screen mesh. The calculations took the speed of the dosing squeegee of 2…20 cm/s, inclination angles of 75°…105°. The design pressure is in the range of 2082.08…34604.2 PA, the estimated depth of ink filling the mesh is 25…280 microns.
The experimental method for testing relaxation of pneumatic elements with a rubber-cord casing
Authors: Korneyev V S , Korneyev S A , Shalay V V 
Published: January 2020

Abstract
The method for the experimental study of the viscoelastic properties of pneumatic elements with a rubber-cord casing is proposed. Based tests of relaxation in which the height of the pneumatic element is kept constant (a practically incompressible fluid is used as the working medium). The implementation of the method is illustrated by the example of the rubber-cord casing of the balloon type of model N-50. The value of the absorption coefficient (relative hysteresis) is established, which in order of magnitude coincides with the value of the absorption coefficient of tread rubbers given in literary sources. In the process of holding the height of the pneumatic element at a constant level, increments of the force of the pneumatic element and overpressure are proportional to each other with a proportionality coefficient depending on the value of the internal volume and height of the air element. The comparative analysis of the features of the operation of pneumatic elements in cases where the working medium is a gas or liquid is done. The results obtained are of interest in the development of vibration protection and vibration isolation systems for technical objects, the design of which includes air springs, air damping shock absorbers and rubber-hydraulic vibration mounts.
The experimental method for determining the geometric characteristics of pneumatic elements with rubber-cord casing
Authors: Korneyev V S , Korneyev S A , Kvasov I N 
Published: January 2020

Abstract
The method for experimentally constructing the geometric characteristics of pneumatic elements with rubber-cord casing at zero and quasi-zero pressure is proposed. The practical implementation of the method by the example of the rubber-cord shell of the balloon type of model N-50 is illustrated. The processed experimental data in an analytical form presents the empirical dependences of the internal volume on the height of the pneumatic element at zero and quasi-zero overpressure. The obtained parameters are mandatory for the model of air spring and study the damping phenomenon. The results obtained are intended for the development of vibration protection and vibration isolation systems for technical objects, the design of which includes air springs and air damping shock absorbers.
Application of Hermite splines for load movement on a flexible crane suspension through a curvilinear trajectory
Authors: Korytov M S , Shcherbakov V S , Titenko V V 
Published: January 2020

Abstract
Analytical expressions of the coordinates of the load, the suspension point and the rope deviation angle, as well as their first three time derivatives were obtained by setting the desired load movement trajectory on a pendulum type flexible crane suspension using two-point Hermite splines with the quartic highest derivatives. A well-known mathematical model of the oscillatory system described by a linearized differential equation was used. With the described movements, the uncontrollable pendulum oscillations of the load are absent. The load moves exactly along a reference trajectory. The superposition of load movements in two mutually perpendicular planes solves the problem of synthesising the suspension point trajectory, which ensures the movement of load along an arbitrary smooth curvilinear trajectory in the horizontal plane. The second horizontal coordinate of the load was represented as an interpolation polynomial from the first horizontal coordinate. The division of the movement trajectory along the axis of the second horizontal coordinate into several sections of the same length provide the determination of the load movement and its derivatives at reference points, as well as the calculated suspension point trajectory. The developed technique is promising for application in intelligent mechatronic control systems for travelling and bridge-travelling cranes.
Research of accuracy of industrial robot at work as part of flexible machining cells
Authors: Morev D S , Blokhin D A , Koltzov A G 
Published: January 2020

Abstract
In this paper, the factors affecting the accuracy of an industrial robot with an articulated kinematic as part of flexible production modules were analyzed. The accuracy of the circular movements of the robot gripper depending on the position in the working area and the load applied to the robot. A method for measuring stiffness using a laser interferometer and optics for measuring straightness is proposed. According to the results of the experiments, the types of errors were determined, causing the greatest error in the accuracy of the industrial robot movements. Recommendations on the need to measure certain types of errors when setting up flexible production modules are given.
Longitudinal stress waves in viscoelastic and plastic rods
Authors: Proskuriakov N E , Lopa I V , Zverev I V 
Published: January 2020

Abstract
Dynamic loading of rod construction from viscoelastic and plastic material is considered. For a task solution on distribution of a wave of tension of compression in a rod, the interconnected hypotheses, which allowed receiving an analytical solution, offered. Convenient analytical representation of tension distribution of a rod longwise for the wave of compressing tension of extending in viscoelastic and plastic material of a rod at blow to its end face tough weight is offered. Satisfactory approval of results of numerical calculations and data of the previous researchers that does use of this method practically feasible for a solution of applied tasks is shown.
Simulation modeling of the assembly process
Authors: Revina I V , Trifonova E N 
Published: January 2020

Abstract
In the article the models allowing one to simulate performance of assembly process in terms of conveyor production are developed. The technological process of assembly production is a complex system depending on a number of production factors, such as the parameters and modes of equipment operation, the level of work skills, the type of production, etc. The relevance of the study is to identify bottlenecks in the organization of the production process and answer the question "what if" when considering different models of the assembly process. The purpose of the work is to assess the impact of production factors (number of operators, operating parameters and type of conveyor, failures in the conveyor operation) on the implementation of the assembly process and to justify the effectiveness of each model of the assembly process economically. For modeling the operating technological process of assembly was considered. The obtained results showed that, depending on production factors, productivity can vary by 4.5 times. The best of the considered options is the use of the accumulation conveyor, where the profit would be 13485.26 $. The worst one is the accumulation conveyor with failures on one of the operations and complete standstill of the assembly line to fix them. On implementing such a scenario, production profit would be 2981.15 $.
Contact pressure in interference joint with modified grooves of shallow depth
Authors: Ryazantseva I L , Fedorova M A , Zgonnik I P 
Published: January 2020

Abstract
The analytical method for determining the magnitude of the contact pressure in a cylindrical interference joint with shallow depth grooves is described in the publication. This method takes into account the geometric features and the relative position of the external members.
The calculated dependences are based on the Lame’s formulas are given in the publication. They can be used to assess the bearing capacity of the joint at any macrogeometry of the joint, independently of the number, shape, size of grooves and their location.
The method is different by simplicity and visibility. It provides sufficient accuracy of results for engineering calculations.
Restoration of the current signal from solar panels of AIST small spacecraft for estimate the parameters of the rotational motion
Authors: Sedelnikov A V , Ivashova T A , Safronov S L 
Published: January 2020

Abstract
The paper deals with the problem of estimating the rotational motion parameters of the prototype of the small spacecraft "Aist" using data on the current from solar panels. The spectral analysis of the signal is carried out. The continuous signal was restored by its discrete readings using the Kotelnikov series. The angular velocity of the rotational motion of the prototype of the small spacecraft "Aist" is estimated. A comparative analysis of the results with the results obtained by other authors. Conclusions are drawn about the changes in the parameters of the rotational motion of the prototype of the small spacecraft "Aist" during its orbital flight.
Methods of the analytical study of vibratory drum forced vibrations during the soil compaction
Authors: Tarasov V N , Boyarkina I V , Boyarkin G N , Serebrennikov V S 
Published: January 2020

Abstract
The fundamental principles of the vibration theory as a classical science are widely used for the description of movements of technical objects and mechanical systems. Vibrations of real objects are complicated by non-linear characteristics of stiffness of the medium to be compacted and viscous friction forces. Usable vertical movements of a vibratory drum have been determined whereby the technological compaction operation of materials and soils is performed. The methods of the vibratory drum vertical movement determination have been developed by means of considering the vibratory drum downward movement during the semi-period of one rotation of the eccentric weight. The operating process of the road roller vibratory drum is composed of sequential periodic transient operating processes of the material compaction and idle cycles in each turn of the eccentric weight rotation. Within the process of the study the operating process is considered of the vibratory drum downward movement during the material compaction, consisting of free damped and undamped forced downward movements of the vibratory drum. For the first time the damping time of transient processes during the analysis of forced oscillatory processes is regulated by the semi-period time of the eccentric weight rotation t = 0.5T.
Study of the dynamic processes of the vibratory drum rebound from the compacted surface
Authors: Tarasov V N , Boyarkina I V , Boyarkin G N , Serebrennikov V S 
Published: January 2020

Abstract
Fast dynamic processes of material compaction by vibration rollers represent random dynamic processes, wherein characteristics of the strength of compacted material, humidity, temperature, types of materials and their characteristics change stochastically. However, from the total set of these processes it is possible to single out such processes, which belong to the category of random ones because of their insufficient state of knowledge but they are deterministic. Such processes may include the vibratory drum dynamic vertical movements during the material compaction. In the process of the study the vibratory drum downward and upward movement modes are considered under the action of the dynamic driving force, which while projecting onto a vertical axis turns into a harmonic force acting periodically downwards and upwards and it is a deterministic parameter. Other mass and kinematic characteristics of the vibratory drum are also deterministic ones. On the basis of classic laws of dynamics the vibratory drum bouncing dynamic processes in the final stage of the compaction technological process and accompanying process of the vibratory drum vertical downward movement have been analytically considered. The necessity to solve such problem is justified by the fact that the dynamic process parameter determination by experimental methods is connected with significant physical and material expenses. New knowledge has been obtained that is necessary for the improvement of the vibration roller designs and modes of their operation.
Impact of ultrasonic exposure and external pressure in a closed volume on the temperature of the evaporated liquid
Authors: Trushlyakov V I , Lesnyak I Y , Novikov A A 
Published: January 2020

Abstract
The influence of ultrasonic exposure (UE) and external pressure on the process of heat and mass transfer during liquid evaporation is studied, which is an urgent task, since UE is widely used in various technological processes, and the parameters of UE and external pressure determine their effectiveness. Experimental studies of the effect of UE and pressure in a vacuum chamber on the temperature of the evaporated liquid at a constant ultrasonic frequency of 25 kHz and an amplitude of ultrasonic vibrations of 2 μm were carried out. The dependences of the change in the relative load on the amplitude of the oscillations of the bottom of the bath with a change in pressure in a closed volume are obtained, and coefficients are determined that refine the thermal physico-mathematical model of the wave processes in a liquid with ultrasound and a change in external pressure in a closed volume. The liquid temperature from the initial moment of time sharply increases from 27.7 ° C to 32.8 ° C, and then, when the pressure in the vacuum chamber reaches 45 kPa, it gradually decreases until an ice crust forms on the liquid surface. A comparative analysis of the results of mathematical modeling, taking into account the use of refinement coefficients and the results of experimental studies showing that the discrepancy between the temperature of the evaporated liquid, from the initial moment of time to the moment of formation of cavitation bubbles on the surface of the liquid, is 8%. The discrepancy between the temperature of the evaporated liquid from the moment of formation of cavitation bubbles to the freezing point of the liquid is up to 50%, which is explained by the error in measuring the temperature of the liquid with thermocouples during the formation of cavitation bubbles.
Thermomechanical method of increasing the mechanical properties of cermets
Authors: Vasil’ev E V , Popov A Yu , Chernykh I K 
Published: January 2020

Abstract
Thermomechanical method of increasing the mechanical properties of cermets leads to a buildup in the durability of cutting tools up to 2 times. However, after thermomechanical processing, a defective layer of 0.8 mm in-depth forms on the outer surface of the processed workpiece, which is caused by of the oxidation of WC tungsten carbide. In order to prevent oxidation on the workpiece surface, it is proposed to use a nickel coating, which reduces the oxidation of WC by more than 30 times when it is heated to a temperature of 1000 °C.
Development and Research of an Experimental Prototype of the Positive Displacement Two-Stage Piston Hybrid Energy-Generating Machine
Authors: Zanin A V , Shcherba V Ye , Nosov E Yu , Paramonov A M , Blinov V N , Khrapsky S Ph 
Published: January 2020

Abstract
This paper considers the new principle diagram of the positive displacement two-stage piston hybrid energy-generating machine. A prototype of the two-stage piston hybrid energy-generating machine has been developed based on the analysis of working processes and frames of piston hybrid energy-generating machines, as well as by using preliminary theoretical studies. This prototype allows to visualize the movement of the liquid piston in the second stage of the machine. A set of experimental studies on a previously developed and modernized test bench made it possible to prove the working capacity of the prototype, to measure the main thermodynamic and discharge parameters, and to identify the main features of the ongoing work processes.
Spent coal mines using for the industrial wastewater disposal
Authors: Bondareva L , Zakharov Yu 
Published: January 2020

Abstract
Industrial wastewaters disposal, in particular wastewaters appearing from the coal extraction and enrichment, is an important national economic task of preserving environment. At the same time, the applied wastewater disposal technologies must be ecologically safe and do not requires large financial expenses. This task is quite relevant for Kuzbass due to territory saturation of the coal, metallurgical and chemical industrial enterprises. The paper discusses a mathematical model of one of these technologies -the wastewater treatment in spent workings of closed and flooded coal mines. The proposed mathematical model allows studying the treatment processes occurring in the flooded mine workings, that using numerical experiments and taking into account the slurry water characteristics and changes of the incoming groundwater volume and of the injected wastewater volume. The process of suspended in mine waters coal and rock particles sedimentation and sediment compaction is given special attention in the model. Numerical experiments results, that allowing estimating the safe time mine act as a wastewater treatment plant, are presented.
Multi-step probabilistic assessment in the problems of identifying indicators functioning of the gas distribution network
Authors: Khodzhaev N Sh T , Ganieva N A , Gostev N V , Khodzhaev T T 
Published: January 2020

Abstract
The paper poses and solves the problem of applying the method of multi-step probabilistic assessment in the problems of identifying indicators functioning of the gas distribution network. Gas distribution networks in operation are often subject to emergency situations. This causes the implementation of the restoration work on the basis of experimental a priori information. In this regard, computational experiments make it possible to produce predictive values of the performance indicators of the gas distribution network and, accordingly, to identify them with real data.
Investigation of the propagation of waves of sudden change in mass flow rate of fluid and gas in a “short” pipeline approach
Authors: Khujayev I , Bozorov O , Akhmadjonov S 
Published: January 2020

Abstract
The problem of the propagation of waves of sudden change in mass flow rates originated at the ends of a pipeline of a finite length is formulated and solved analytically in the paper. In the process of modeling, it was assumed that the route change in pressure is due to the local component of the inertia force, and the velocity of propagation of waves of small pressure disturbances depends on the elastic properties of the pipeline material and fluid. The Dirichlet problem with respect to mass flow rate is solved by the Fourier method and a periodic solution is obtained in the form of a functional series. Instead of solving the Neumann problem with respect to hydrostatic pressure, a pressure solution is obtained by integrating the mass conservation equation over time, where the known solution of the problem with respect to mass flow is used. The options for using the solution for cases of low and super compressible fluids, as well as for studying the propagation of longitudinal waves in an elastic rod, are discussed. According to analytical solutions, a series of calculations was carried out for the problems of instantly closing the inlet and/or outlet sections of the functioning area, as well as for the problem of gas pumping into the elementary section of the pipeline. The features of the propagation of compression and rarefaction waves in the context of the above tasks are investigated. Some graphical results are presented and analyzed.
Formalizing the search of targets with given coordinates distribution
Authors: Nartov B K , Poluyanov A N 
Published: January 2020

Abstract
The paper presents a new approach to formalizing the tasks of an optimal search of the targets with given coordinates distributions. The main problems of formalizing this task group are highlighted. The method is described, that allows one to avoid non-analytical limitations on search units control. The formalization scheme for optimal search planning problems is shown. The features of real-time search control are considered for the cases, when the moments and coordinates of target detection are known. The search simulation results partially verifying the proposed method are given.